Papers - IRIE Mitsuteru
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Irie M., Manabe Y., Yamashita M.
Drones 8 ( 6 ) 2024.6
Publishing type：Research paper (scientific journal) Publisher：Drones
The observation of the phytoplankton distribution with a high spatiotemporal resolution is necessary to track the nutrient sources that cause algal blooms and to understand their behavior in response to hydraulic phenomena. Photography from UAVs, which has an excellent temporal and spatial resolution, is an effective method to obtain water quality information comprehensively. In this study, we attempted to develop a method for estimating the chlorophyll concentration from aerial images using machine learning that considers brightness correction based on insolation and the spatial distribution of turbidity evaluated by satellite image analysis. The reflectance of harmful algae bloom (HAB) was different from that of phytoplankton seen under normal conditions; so, the images containing HAB were the causes of error in the estimation of the chlorophyll concentration. First, the images when the bloom occurred were extracted by the discrimination with machine learning. Then, the other images were used for the regression of the concentration. Finally, the coefficient of determination between the estimated chlorophyll concentration when no bloom occurred by the image analysis and the observed value reached 0.84. The proposed method enables the detailed depiction of the spatial distribution of the chlorophyll concentration, which contributes to the improvement in water quality management in reservoirs.
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Irie M., Arakaki S., Suto T., Umino T.
Remote Sensing 16 ( 1 ) 2024.1
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Remote Sensing
Riverbed materials serve multiple environmental functions as a habitat for aquatic invertebrates and fish. At the same time, the particle size of the bed material reflects the tractive force of the flow regime in a flood and provides useful information for flood control. The traditional riverbed particle size surveys, such as sieving, require time and labor to investigate riverbed materials. The authors of this study have proposed a method to classify aerial images taken by unmanned aerial vehicles (UAVs) using convolutional neural networks (CNNs). Our previous study showed that terrestrial riverbed materials could be classified with high accuracy. In this study, we attempted to classify riverbed materials of terrestrial and underwater samples including that which is distributed in shallow waters where the bottom can be seen using UAVs over the river segment. It was considered that the surface flow types taken overlapping the riverbed material on images disturb the accuracy of classification. By including photographs of various surface flow conditions in the training data, the classification focusing on the patterns of riverbed materials could be achieved. The total accuracy reached 90.3%. Moreover, the proposed method was applied to the river segments to determine the distribution of the particle size. In parallel, the microtopography was surveyed using a LiDAR UAV, and the relationship between the microtopography and particle size distribution was discussed. In the steep section, coarse particles were distributed and formed riffles. Fine particles were deposited on the upstream side of those riffles, where the slope had become gentler due to the dammed part. The good concordance between the microtopographical trends and the grain size distribution supports the validity of this method.
DOI： 10.3390/rs16010173
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Irie M., Nakagawa A., Higashi T.
Water (Switzerland) 15 ( 18 ) 2023.9
Authorship：Lead author, Corresponding author Publishing type：Research paper (scientific journal) Publisher：Water (Switzerland)
In the uppermost stream of the Mimikawa River, in northern Miyazaki Prefecture, the contribution to river turbidity of a huge, collapsed slope alternating sandstone and mudstone layers was qualitatively shown in our previous study. In this study, the water level and turbidity were continuously observed, to obtain a quantitative estimation of this contribution. The conversion equation from the water level to the flow rate is required, but field measurements during the flooding term in the mountainous site are difficult. In this study, a high-resolution survey was conducted, and the relationship was determined via a small-scale hydraulic model shaped using a 3D printer from the survey results, to determine the relationship between the water level and the flow rate. The flow rate time series was reproduced with the distributed runoff model that is verified with the flow rate converted from the water level. The flow rate and turbidity load time series were also estimated from the long-term rainfall. The area of the bare soil surface of each small basin was obtained via satellite image analysis, and the soil yield from each surface condition was calculated. Furthermore, the amount of turbidity produced upstream of Kamishiiba Dam was calculated for each small basin. It was estimated that 24% of the turbidity was generated from the small basin covering 5.7% of the total catchment area. This study showed that it is possible to verify the hydrological model by obtaining the water-level–discharge relationship, even in the mountains, where it is difficult to observe the discharge on-site, via small-scale hydraulic model experiments.
DOI： 10.3390/w15183186
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Ito K., Matsunaga M., Itakiyo T., Oishi H., Nukazawa K., Irie M., Suzuki Y.
International Journal of Sediment Research 38 ( 3 ) 469 - 480 2023
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：International Journal of Sediment Research
Sediment causes a serious problem in relation to dam function. A cooperative sediment sluicing operation has been under way since 2017 to prevent sediment from accumulating in dams in the Mimi River, Miyazaki, Japan. To achieve a smooth and stable operation, it is very important to determine the sediment source and a sediment transport system to maintain the dam's function. In the current study, the source and transport of sediment from the Mimi River basin have been analyzed with X-ray diffraction (XRD) to reveal the peaks of mineral species. The sediment samples were collected in the Mimi River basin from the Tsukabaru Dam to the sea in an area including 4 dams and 5 tributaries. In addition, the minerals in samples collected in 2014, before the start of the sediment sluicing operation, and from 2018 to 2020, after the start of the operation, were analyzed. An evaluation of the similarity of the sediment at each sampling point based on the X-ray diffraction peaks of mineral species showed that sediment distributed upstream was transported downstream in the year when the sediment sluicing was done. This result indicates that the sediment sluicing operation at dams ensured the continuity of the sediment distribution in the Mimi River basin. In addition, an investigation done in 2020 showed that sediment particles very similar to those of the upstream tributaries were deposited downstream because of extensive flooding caused by a large typhoon. The management of sediment transport has the greatest importance in a river basin where a dam is to be constructed. It is possible to trace the history of the sediment distribution and movement resulting from the operation of sediment sluicing by using sediment mineral analysis.
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Prediction of the discharge in Pech River for the flood warning system, based on the time series of snow cover area and meteorological data Reviewed
HOSSAINI Hossaini Mir Mohammad Mones, IRIE Mitsuteru
Journal of Arid Land Studies 32 ( 3 ) 93 - 93 2022.12
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：日本沙漠学会
Floods in the arid areas provide fertile soil and water resources, enabling agricultural production. Based on its productivity, towns with a large population have developed along the riverbanks. On the other hand, large flood beyond the expectation will cause enormous human and economic damage. The Pech River, our study site, is a tributary of the Kunar River, which runs through eastern Afghanistan. The catchment area of the river is populated by 35.5% of the population and has 21% of the agricultural land of Kunar province.The main source of the river discharge is melted snow in the upper mountainous areas, and the maximum discharge that appears in the following spring changes depending on the amount of snowfall in the previous winter. In the year of heavy snowfall in the upper mountainous areas, the residential areas and the agricultural lands along the river experienced severe inundation.Therefore, it is necessary to predict the peak discharge in spring in advance and provide appropriate flood warnings so that the local residents can take evacuation and damage mitigation measures. In this study, we tried to develop a method for predicting the peak discharge based on the fluctuation of snow cover area evaluated with satellite images, temperature, and rainfall of the upper reaches of the Pech River.First, the boundary of the river catchment was identified based on the DEM of 30 m mesh acquired by Advanced Land Observing Satellite (ALOS). Next, the Snow cover distribution data between 2008 and 2018 at weekly intervals was downloaded from the National Snow & Ice Data Center (NSIDC) database, and the catchment area was extracted. Daily temperature and precipitation data at the station nearby the catchment stored in the database of National Oceanic and Atmospheric Administration (NOAA) were expected as the parameter explaining the snow melting process in spring.We tried to reproduce the discharge of the Pech River using these explanatory variables related to the process of snowfall and snowmelt with some statistical and stochastic methods. The multi-regression analysis and Neural Network were examined to reproduce the discharge fluctuation of Pech River.
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Estimating the impact of rainwater harvesting system installation on floods using hydrological models Case study: Nyabugogo valley, Kigali Reviewed
ALINE Uwineza, IRIE Mitsuteru
Journal of Arid Land Studies 32 ( 3 ) 92 - 92 2022.12
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：日本沙漠学会
Rwanda, a landlocked country located in East Africa, is under the temperate climate due to the high altitude though near to the equator. 5.3% of the territory is covered by water bodies, lakes, and rivers. Both rainy and dry season come twice a year with frequent inundations and water shortage. Kigali, the capital city, and the most populated city in the country, is affected by floods during rainy season. Nyabugogo valley, the downtown of the capital is the typical affected area with devastating damage. The mitigation measures such as widening Mpazi drainage channel were taken by the government based on a number of researches. However, the inundation still occurs every year. This research aims to propose rainwater harvesting (RWH) that can supply water to each household, as a mitigation measure to floods. In order to assess the effect of RWH installation on the flood control, Runoff modeling and simulation of Flood inundation was carried out.Nyabugogo river catchment area, delineated using DEM, is 1663.95 km<sup>2</sup>. The dominant land cover is forest (65%) and crop land (22%). Run-off from the upper catchment area was simulated using SWAT model with input data of elevation, soil, and land use data. The simulation was done for 3 years 2011-2013 and calibrated using SWAT CUP.IRIC Nays2Dflood Model was used to simulate and visualize the flooded area with the input data of the discharge simulated by the above modeling and water level at downstream of the flooded area for the flood event reported on March 2<sup>nd</sup> and 3<sup>rd</sup> 2020. The boundary conditions were set along the river, with two inflow points: Nyabugogo river and Mpazi outlet. The maximum water depth and the maximum velocity were observed at the confluence of the two streams; and flood extended throughout the valley. The accuracy of the simulation was checked by comparison with the sentinel2 satellite images.The RWH system installation will be simulated and its hydrological impact on flood will be assessed as the final outcome of this research. Rainwater harvesting system installation, additionally to reducing flood mitigation, can contribute to improvement of the population’s health and sanitation, which aligns with the SDGs. Knowing the extent at which RWH can reduce flood, will open to further studies on design and cost analysis of the system.
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Farmers’ preferences of the agricultural inputs for rice farming in Senegal River Basin, Mauritania: A best-worst scaling approach Reviewed International coauthorship
MARUYAMA Yuki, UJIIE Kiyokazu, AHMED Cherif, DIAGNE Mandiaye, IRIE Mitsuteru
Journal of Arid Land Studies 32 ( 3 ) 69 - 69 2022.12
Language：English Publishing type：Research paper (scientific journal) Publisher：日本沙漠学会
In Mauritania, consumption of rice, which is a staple food, is increasing rapidly, because rice takes less time to cook than other cereals such as millet, sorghum, and maize. To meet this growing demand, Mauritanian food policy encourages rice imports. However, the 2008 food crisis led to rice shortage, owing to a steep rise in the price of imported rice. To ensure overall food security, the government has adopted certain agricultural policies and projects to bolster rice production in the Senegal River Basin. Under these circumstances, numerous previous studies suggested solutions for improving productivity and efficient farm management. Whereas, these studies were leaded by the field observation to grasp current farm condition and the questionnaire survey for understanding the actual amount of inputs (e.g. fertilizer and pesticide) and harvest, the preferences and perceptions of local farmers regarding rice farming have been neglected. In order to achieve the sustainable agricultural development, cooperation of local farmers is indispensable. Therefore, farmers’ perceptions should be taken into consideration of agricultural policy making.In this study, we attempted to evaluate the farmers’ preferences of the agricultural inputs for rice farming quantitatively in Mauritania. Furthermore, we clustered farmers with similar preferences and tried to discuss the heterogeneity of preferences based on the characteristics of each group.In order to evaluate these farmers’ preferences, a best-worst scaling (BWS) method was applied with 29 farmers on March, 2018. BWS is a method to evaluate preferences by choosing “most important attribute” and “least important attribute” one by one. In this survey, six attributes which are seed fertilizer, pesticide, irrigation, labor and machinery were assumed. Moreover, based on these results, farmers who have the similar preferences was grouped by a cluster analysis.As the results, while most farmers value seeds and irrigation in rice production, pesticide and labor tend to be neglected. In addition, based on a cluster analysis, farmers were grouped into three groups: (1) group that emphasizes irrigation, (2) group that places the highest priority on agricultural machinery, and (3) group that prefers seeds.On the other hand, as a characteristic of each group, Group 1 includes many farmers engaged in rice production on paddy filed equipped with irrigation facilities, and it can be seen that they understand the importance of irrigation. In group 2, farmers have relatively large-scale paddy field. In order to improve the efficiency, agricultural machineries are emphasized.
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Modeling of Sediment Transportation in Ichkeul Lake for the Estimation of the Influence of the Constructions of the Reservoirs in the Upper Streams Reviewed International coauthorship
Irie M., Kotegawa H., Kawachi A., Ouni H., Tarhouni J.
Water (Switzerland) 14 ( 13 ) 2022.7
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Water (Switzerland)
Rich ecosystems such as estuaries and brackish lakes are vulnerable to the effects of human activities and are prone to environmental changes. In particular, the salt environment, which is the backbone of the environment, might be affected not only by direct modifications such as dredging but also in ways that were not initially envisioned. Ichkeul Lake, located in the northern part of Tunisia, is a shallow brackish lake registered as a UNESCO World Natural Heritage Site. The construction of reservoirs upstream of the inflowing river in the 1980s reduced the amount of freshwater inflow. That only had been thought to be the cause of the increase in salinity in Ishkeul Lake. On the other hand, the sedimentation in the reservoirs upstream was remarkable, and the supply of sediment from the reservoirs upstream to the Ichkeul Lake was stopped. Changes in sediment out-flow may have reduced lakebed altitude and enhanced seawater intrusion. However, the environmental protection measures for the lake so far have focused only on improving the water budget and have not been quantitatively evaluated for sediment transportation. In this study, we first estimated the water budget of the lake. Then the re‐suspension by wind disturbance in the lake was estimated from the correlation with the wind speed based on laboratory experiments and field measurements. The outflow of the sediment estimated with these two models was compared with the sediment volume trapped in the upstream reservoirs that would have flowed into the lake if there had been no construction of the dams. Based on this, we evaluated whether the lake is cur-rently erosive or cumulative. As a result, the estimated annual outflow of sediment to the sea was 4300 tons/year. It was estimated that the construction of the reservoirs upstream changed the trend of lakebed height from accumulation to erosion.
DOI： 10.3390/w14131984
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MANAKA Atsushi, KABURAGI Kaori, FURUYAMA Shoichi, TAFU Masamoto, IRIE Mituteru
BUNSEKI KAGAKU 71 ( 4.5 ) 217 - 220 2022.4
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society for Analytical Chemistry
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HIGASHI Takayoshi, IRIE Mitsuteru
Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 77 ( 2 ) I_583 - I_588 2021.9
Authorship：Last author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
Kamishiiba reservoir has the problem of the turbid water inflow from the upstream catchment area. The main sediment yield is on the bare ground surface after the landslide. In this study, the surface soil and river channel sediments in the catchment area were sampled for examining the similarity with the suspended solid in the turbid water inflow to the reservoir by the mineralogical method. The topsoil of the slope suspected as the cause of the turbidity was aggregated with PIC to examine the possibility of suppressing runoff. In the PIC sprayed area, the soil erosion by raindrop impact can be greatly suppressed, but cracks that developed over time reduced resistance to surface lateral flow, and the sediment yield increases slightly.
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Differentiation of river sediments fractions in uav aerial images by convolution neural network Reviewed
Takechi H., Aragaki S., Irie M.
Remote Sensing 13 ( 16 ) 2021.8
Authorship：Last author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Remote Sensing
Riverbed material has multiple functions in river ecosystems, such as habitats, feeding grounds, spawning grounds, and shelters for aquatic organisms, and particle size of riverbed material reflects the tractive force of the channel flow. Therefore, regular surveys of riverbed material are conducted for environmental protection and river flood control projects. The field method is the most conventional riverbed material survey. However, conventional surveys of particle size of riverbed material require much labor, time, and cost to collect material on site. Furthermore, its spatial representativeness is also a problem because of the limited survey area against a wide riverbank. As a further solution to these problems, in this study, we tried an automatic classification of riverbed conditions using aerial photography with an unmanned aerial vehicle (UAV) and image recognition with artificial intelligence (AI) to improve survey efficiency. Due to using AI for image processing, a large number of images can be handled regardless of whether they are of fine or coarse particles. We tried a classification of aerial riverbed images that have the difference of particle size characteristics with a convolutional neural network (CNN). GoogLeNet, Alexnet, VGG-16 and ResNet, the common pre-trained networks, were retrained to perform the new task with the 70 riverbed images using transfer learning. Among the networks tested, GoogleNet showed the best performance for this study. The overall accuracy of the image classification reached 95.4%. On the other hand, it was supposed that shadows of the gravels caused the error of the classification. The network retrained with the images taken in the uniform temporal period gives higher accuracy for classifying the images taken in the same period as the training data. The results suggest the potential of evaluating riverbed materials using aerial photography with UAV and image recognition with CNN.
DOI： 10.3390/rs13163188
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Effect of Physical Parameters on the Transparency of Ichkeul Lake’s Waters, North–East of Tunisia Reviewed International coauthorship
Ouni H., Irie M., M’barek N.B., Tarhouni J., Tlatli-Hariga N., Dias J.M.
Environmental Science and Engineering 957 - 961 2021.4
Language：English Publishing type：Research paper (international conference proceedings) Publisher：Environmental Science and Engineering
The construction of dams on the Ichkeul Lake rivers, along with drought, has increased the sedimentation problem and caused the decrease of its storage capacity. Therefore, this work aims to highlight the factors responsible for water clarity deterioration. Through the multi-date MODIS imagery analysis, a Water Turbidity Index (WTI) was used to assess the turbidity of the lake and a Delft3D-FLOW hydrodynamic model was used to determine the effect of wind, water level, temperature, and salinity on the turbidity of the lake’s waters. The effect of prevailing wind was analyzed for the two hydrological years 2014–2015 (R2 = 0.3989) and 2015–2016 (R2 = 0.4219). It was found that the water transparency decreases with the increase of wind speed. Besides, the model calibration showed the sensitivity of water temperature and salinity to the lake’s bed roughness. Contrariwise, the water level was not significantly influenced. Consequently, the use of roughness n = 0.018 decreases the errors between observed and simulated data. Altogether, the methodology used in this work allows decision makers to monitor the temporary and spatial water turbidity fluctuations in the Ichkeul Lake.
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Nukazawa K., Shirasaka K., Kajiwara S., Saito T., Irie M., Suzuki Y.
Science of the Total Environment 748 2020.12
Language：English Publishing type：Research paper (scientific journal) Publisher：Science of the Total Environment
Alterations in natural flow regimes caused by dams can significantly alter the aquatic habitats of stream organisms. However, few studies have characterized flow regulation to assess its impacts on stream fauna in the context of interannually variable extreme floods. This study aims to understand the variation in stream animals along flow regulation gradients due to hydropower dams in a catchment experiencing typhoons. We observed freshwater fishes and stream insects at fully regulated sites (receiving residual flow), moderately regulated sites (receiving hydropower outflow), and nonregulated site (tributary) in the Mimi River catchment in southern Japan, in summer and winter from 2010 to 2018. We computed indicators of hydrologic alteration (IHA) in each calendar/water (July to June) year from 2007 to 2017 and selected subsets of IHA based on principal component analysis (PCA) and variance inflation factor. The largest variance was mainly explained by minimum discharge levels (e.g., 30-day annual minimum) and flow variability among IHAs, distinguishing the moderately regulated and nonregulated sites from fully regulated sites because of residual flow and suppressed high pulses in the fully regulated sites. Generalized additive models revealed that annual maxima of specific discharge were most significant predictors of fish and insect metrics while its effects were generally inconsistent between summer and winter. Non-metric multidimensional scaling revealed that insect communities were clustered into the regulation extents in both seasons. The differences in winter fauna between the regulated and nonregulated sites, characterized by Ephemeroptera-Plecoptera-Trichoptera abundance, were associated with maximum discharge and high pulse numbers. Fish community variation did not correspond to flow regime gradients. Our findings on mechanistic ecohydrological consequences of various flow regulations, supported by long-term observations, will be useful for river managers attempting to compensate for alterations in flow regime and ecological integrity.
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Tafu M., Sasakawa N., Murthy H.S., Takamatsu S., Manaka A., Irie M., Toshima T.
Euro-Mediterranean Journal for Environmental Integration 5 ( 1 ) 2020.4
Publishing type：Research paper (scientific journal) Publisher：Euro-Mediterranean Journal for Environmental Integration
The removal of fluoride from environmental surface water and groundwater is an important environmental issue in Tunisia. Notably, Tunisia also faces a shortfall in reservoir capacity due to the buildup of sediment containing calcium carbonate. Dicalcium phosphate dihydrate (DCPD, CaHPO4·2H2O) reacts effectively with fluoride to form stable fluorapatite (FAp, Ca10(PO4)6F2), and the addition of calcium carbonate (CaCO3) effectively inhibits the release of phosphate generated during this reaction. In this study, we tested the potential for fluoride removal using a mixture of DCPD and Tunisian reservoir sediment. The release of phosphate from the reaction of DCPD with fluoride was successfully inhibited using the sediment. The application of the DCPD–sediment mixture led to a high rate of fluoride removal (15–19 mg/g), such that the resulting water met the World Health Organization (WHO) recommended limit for fluoride in water (1.5 mg/L). This removal rate is five to ten times those achieved with conventional fluoride adsorbents such as bone char. Based on these results, the utilization of Tunisian reservoir sediment seems to be an effective solution for removing fluoride from aqueous environments.
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Changes in fluoride removal ability of chicken bone char with changes in calcination time Reviewed
Kikuchi M., Arioka Y., Tafu M., Irie M.
International Journal of Ceramic Engineering and Science 2 ( 2 ) 83 - 91 2020.3
Publishing type：Research paper (scientific journal) Publisher：International Journal of Ceramic Engineering and Science
Changes in fluoride removal ability of chicken bone char (CBC) were investigated by both remained amounts of carbon including organic substances and crystallite size of hydroxyapatite in the CBC. Carbon contents in CBC were controlled by heating time at 600°C. Although temperature for crystal-grain growth for HAp, 650°C, was higher than 600°C, crystallite size of HAp in CBC increased with heating time. Fluoride ion removal ability positively related to the amount of remaining carbon and negatively related to the square of crystallite size, as an index of surface area, of HAp. These results suggested that fluoride ion removal from water by CBC is not only by ion exchange and/or dissolution-precipitation process, but also by adsorption by carbon and/or temporal capture of fluoride ion by microstructure of carbonate in CBC before immobilize it in apatite structure.
DOI： 10.1002/ces2.10034
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Application of image identification by artificial intelligence to aerial pictures taken from UAV for Wadi channel management
Irie M., Takechi H.
The 5th International Symposium on Flash Floods in Wadi Systems, Urban Flood Risk Management: Mitigation and Adaptation Measures in the MENA Region 2020.2
Language：English Publishing type：Research paper (international conference proceedings)
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The effect of optimism bias and governmental action on siltation management within Japanese reservoirs surveyed via artificial neural network Reviewed International coauthorship
Tobias Landwehr, Sameh Ahmed Kantoush, Claudia Pahl-Wostl, Tetsuya Sumi, Mitsuteru Irie
Big Earth Data 4 ( 1 ) 68 - 89 2020.1
Language：Japanese Publishing type：Research paper (scientific journal)
Reservoirs are installed as long-term assets to guarantee water and energy security for decades, if not centuries. However, the effect of siltation undermines reservoirs’ sustainability because it significantly reduces the reservoirs’ original capacity. The present paper attempts to evaluate the global reservoir siltation problem with the optimism bias theorem introduced by Kahneman and Tversky and applied to infrastructural mega-projects by Flyvbjerg and Ansar using artificial neural networks (ANNs) algorithms for large Japanese reservoirs. Japan possesses suitable long-term data and a legal directive concerning the sediment capacity siltation duration, which serves as a valid guide to check whether, over the past 100 years, engineers, planners and managers were capable of judging the sediment input correctly. Various ANN models were established to emulate Japanese reservoir siltation behavior. The networks demonstrate that reservoirs in Japan suffer from optimism bias. In contrast to the law, the dead storage volume of an average dam is supposed to reach capacity after 52 years. This finding joins the overall observation that mega-projects generally and globally suffer from optimism bias. The emulations were subsequently screened for a presumed influence of governance actions, namely, indicating plus monitoring and the change in the market competition situation. While reservoir siltation appears to continue regardless of the level of competition in public procurement, monitoring directives appear to have a considerable impact on improved siltation management, which demonstrates that dedicated governance action can significantly strengthen the sustainable behavior of key infrastructure elements such as reservoirs.
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Evaluation of Consumer Preferences for Rice in Mauritania:A Best-worst Scaling Application Reviewed
MARUYAMA Yuki, UJIIE Kiyokazu, IRlE Mitsuteru, Cherif AHMED, Bouya Ould AHMED
Journal of Rural Economics 91 ( 4 ) 478 - 483 2020
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Agricultural Economics Society of Japan
In West African countries,domestic rice production should be improved to overcome the dependence on imported rice. In order to achieve that,upgrading the domestic rice value chain needs to improve for maintaining high competitiveness of domestic rice relative to imported rice. This study investigates consumer preferences of rice in Mauritania.We used best-worst scaling and latent class analysis. The results emphasize the importance of cleanliness attributes in consumer choice and identify three latent segments: "preferences for price and cleanliness attributes","strong preference for cleanliness attributes",and "preference for clean rice with high swelling capacity and safety attributes".
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In situ characteristics of bottom sediment in Ichkeul Lake, Tunisia Reviewed
Suetsugu D., Hata T., Irie M.
Euro-Mediterr Journal for Environmental Integration 4 ( 35 ) 2019.11
Language：English Publishing type：Research paper (scientific journal)
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Effect of physical parameters on the transparency of Ichkeul Lake’s waters, Northern-East Tunisia
Ouni H., Irie M., Ben M’barek N., Tarhouni J., Tlatli-hariga N., Miguel D. J.
Euro-Mediterr Conference for Environmental Integration 2019.10
Language：English Publishing type：Research paper (international conference proceedings)
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Development of an eco-friendly bio-based granular geomaterial for the environmental restoration of Ichkeul Lake, Tunisia Reviewed International coauthorship
Hata T., Suetsugu D., Kawachi A. and Irie M
Euro-Mediterr Journal for Environmental Integration 4 ( 21 ) 2019.9
Language：English Publishing type：Research paper (scientific journal)
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Development of water turbidity index (WTI) and seasonal characteristics of total suspended matter (TSM) spatial distribution in Ichkeul Lake, a shallow brackish wetland, Northern-East Tunisia Reviewed
Ouni H., Kawachi A., Irie M. Ben M’Barek N., Tlatli N., Tarhouni J.
Environmental Earth Science 2019.3
Language：English Publishing type：Research paper (scientific journal)
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モーリタニアにおける消費者のコメ選好に関する評価 －選択実験による接近－ Reviewed
丸山優樹，入江光輝，氏家清和
フードシステム研究 25 ( 4 ) 193 - 198 2019.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Resource potential of reservoir sediment for functional material for purifying drinking water
Irie M., Tafu M., Fuji M., Tarhouni J.
The Fourth International Symposium on Flash Floods in Wadi Systems 2018.12
Language：English Publishing type：Research paper (international conference proceedings)
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The Effect of Optimism Bias on Sedimentation within Japanese Reservoirs surveyed via Deep Learning Methodologies
Landwehr T., Irie M., Pahl-Wostl C.
The Fourth International Symposium on Flash Floods in Wadi Systems 2018.12
Language：English Publishing type：Research paper (scientific journal)
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Experiment of a resource-oriented agro-sanitation system for urban slum area: Case of indonesia
Sintawardani N., Ushijima K., Hamidah U., Deguchi Y., Triastuti J., Funamizu N., Irie M., Ishikawa T.
Resource-Oriented Agro-sanitation Systems: Concept, Business Model, and Technology 921 - 314 2018.7
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Resource-Oriented Agro-sanitation Systems: Concept, Business Model, and Technology
© Springer Japan KK, part of Springer Nature 2019. All rights reserved. This chapter describes case study of applicability assessment for resource-oriented agro-sanitation business for urban slum in Indonesia, based on interdisciplinary field survey, (1) economic feasibility assessment, (2) demand potential assessment, and (3) social acceptability. The value flow analysis evaluated garbage disposal cost and excreta disposal cost at 0.7 and 1.1%, respectively, of household income, which represents a reasonable cost to disposers. However, under the current disposal scheme, negative value due to excreta disposal to river appears to be passed on to downstream populations. The structure of this value flow indicates that little attention is paid to the negative externalities, indicating that a solution in this case may be difficult to obtain. The affordable initial cost of a new resource recycling system was evaluated and compared with the costs of a currently available compost toilet by evaluating equipment lifetimes and potential income streams available from the sale of human excrement fertilizers. To estimate a value for the human excrement fertilizer, real-world case study in Indonesia, in which money was paid in exchange for human urine, was referred to. The evaluated affordable initial cost derived was sufficiently comparable to the price of a cheaper composting toilet currently available in the market. This implies that such a resource recycling system is feasible even in an urban slum. Results of demand and supply assessment showed that if resource-oriented sanitation system was diffused, supply would excess demands in the circle of 32 km radius, therefore cost discussion should assume more than 32 km transportation. According to the results ofcase estimation of tea plantation, total cost for fertilizer provided by resource-oriented sanitation system is possibly competitive to the normal price of synthetic fertilizer. However, if compared to subsidized price for low-income farmers, it seems difficult to compete. Regarding social aspect, the context of Islamic law is important. Islamic authorities regarded the resource-oriented sanitation system as no problematic concept and acceptable in the context of Islamic law.
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Discussing the proprieties of the conventional assessment of flood control investment focused on the undeveloped area Reviewed International coauthorship
Maruyama Y., Nakamura T., Ahmed B., Ahmed C., Ujiie K., Irie M.
WIT Transactions on the Built Environment 184 153 - 166 2018.5
Language：English Publishing type：Research paper (scientific journal) Publisher：WIT Transactions on the Built Environment
© 2018 WIT Press. Large rivers running through arid regions but originating in tropical rain forests are considered as precious water resources along their riverbanks. However, upstream inundation due to flooding during the rainy season is a constraint for development. When flood control projects are proposed for such areas, technical hazards exist. To introduce a flood control project, Cost-Benefit Analysis (CBA) is used to evaluate the project’s effectiveness based on computational fluid dynamics (CFD) simulation that is widely adopted for decision-making. Numerous studies applying shallow water models have focused on small urbanized areas. These studies employed fine-gridded digital elevation model (DEM) in the CFD simulation for precise evaluation. In contrast, for simulating large riverbanks of undeveloped areas, coarse-gridded DEM must be used to reduce the computational time. However, this does not consider the micromorphology. Resultantly, reproducibility of the simulation is degraded. The bank of the Senegal River was selected as our study site. Conventional CFD simulation was carried out. A coarse-gridded DEM was applied to reduce the computational time, but did not show enough reproducibility. We tried to employ General Purpose Computing on Graphics Processing Unit (GPGPU), a parallel computing method, with a fine-gridded DEM. It improved the reproducibility. In addition, the preferred conventional CBA method of the Japan International Cooperative Agency was applied to the study site. Conventional CBA was developed to assess the flood control investments mostly in urbanized areas. When applying it to undeveloped areas that have lower asset values than urbanized areas, as expected, the evaluated benefit was lower than the cost of the project. However, agricultural productivity contributes to improved food security and trade balance of the country. The flood control investment related with agricultural development should consider those externalities as benefits. This motivates us to develop an appraisal method in future research.
DOI： 10.2495/FRIAR180151
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Mtibaa S., Hotta N., Irie M.
Science of the Total Environment 616-617 1 - 16 2018.3
Authorship：Last author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Science of the Total Environment
© 2017 Elsevier B.V. Soil erosion can be reduced through the strategic selection and placement of best management practices (BMPs) in critical source areas (CSAs). In the present study, the Soil Water Assessment Tool (SWAT) model was used to identify CSAs and investigate the effectiveness of different BMPs in reducing sediment yield in the Joumine watershed, an agricultural river catchment located in northern Tunisia. A cost-benefit analysis (CBA) was used to evaluate the cost-effectiveness of different BMP scenarios. The objective of the present study was to determine the most cost-effective management scenario for controlling sediment yield. The model performance for the simulation of streamflow and sediment yield at the outlet of the Joumine watershed was good and satisfactory, respectively. The model indicated that most of the sediment was originated from the cultivated upland area. About 34% of the catchment area consisted of CSAs that were affected by high to very high soil erosion risk (sediment yield > 10 t/ha/year). Contour ridges were found to be the most effective individual BMP in terms of sediment yield reduction. At the watershed level, implementing contour ridges in the CSAs reduced sediment yield by 59%. Combinations of BMP scenarios were more cost-effective than the contour ridges alone. Combining buffer strips (5-m width) with other BMPs depending on land slope ( > 20% slope: conversion to olive orchards; 10–20% slope: contour ridges; 5–10% slope: grass strip cropping) was the most effective approach in terms of sediment yield reduction and economic benefits. This approach reduced sediment yield by 61.84% with a benefit/cost ratio of 1.61. Compared with the cost of dredging, BMPs were more cost-effective for reducing sediment loads to the Joumine reservoir, located downstream of the catchment. Our findings may contribute to ensure the sustainability of future conservation programs in Tunisian regions.
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Adaptability Sediment in Joumine Reservoir, Tunisia, as a ceramic raw material Reviewed
Masayoshi Fuji, Junzo Tsuchimoto, Chika Takai, Ryosuke Goto, Mitsuteru Irie, Jamila Tarhouni
Euro-Mediterranean Journal for Environmental Integration 2 2017.10
Language：English Publishing type：Research paper (scientific journal)
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Trial production of porous ceramics filter made from sediments in water reservoirs for sustainable use of surface water resource in arid land Reviewed
Irie M., Taga S., Tarhouni J., Fuji M.
International Journal of Environmental Science and Development 8 ( 8 ) 549 - 556 2017.7
Language：English Publishing type：Research paper (scientific journal)
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チュニジア国Joumine貯水池堆積土を用いた浄水フィルター用容器の作製 Reviewed
藤 正督, 高井千加, 土本順造, 入江光輝, Jamila Tarhouni
沙漠研究 27 ( 4 ) 2017.7
Language：Japanese Publishing type：Research paper (scientific journal)
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未利用資源を用いたフッ素処理資材の開発と性能評価 Reviewed
袋布昌幹, 藤田沙也, 京角早織, 豊嶋剛司,高松さおり, 間中淳, 入江光輝
沙漠研究 27 ( 4 ) 2017.7
Language：Japanese Publishing type：Research paper (scientific journal)
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色情報を用いた水質調査用Androidアプリケーションの開発 Reviewed
古山彰一, 中村尊, 小林龍也, 藤島政樹, 間中淳
沙漠研究 27 ( 4 ) 2017.7
Language：Japanese Publishing type：Research paper (scientific journal)
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スマートデバイスによる携帯型オンサイト水質分析～乾燥地における硝酸態窒素測定を例として～ Reviewed
間中淳, 横田優貴, 中村尊, 古山彰一, 袋布昌幹, 入江光輝
沙漠研究 27 ( 4 ) 2017.7
Language：Japanese Publishing type：Research paper (scientific journal)
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乾燥地における貯水池堆砂問題 Reviewed
入江光輝
沙漠研究 27 ( 4 ) 2017.7
Language：Japanese Publishing type：Research paper (scientific journal)
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Kawachi A., Ishikawa T., Irie M.
Regional Studies in Marine Science 14 63 - 72 2017.7
Authorship：Last author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Regional Studies in Marine Science
© 2017 Elsevier B.V.The life history of the soldier crab Mictyris guinotae in Amparu Tidal Lagoon on Ishigaki Island, Japan was investigated through population measurements with detailed size classifications. Surveys and measurements were carried out at 15 sampling points every 2 weeks during the 4-month incubation season starting in December 2005, and twice in April and in June 2006 when juveniles started and finished settlement, respectively, in the lagoon. Supplementary measurements were conducted every month from December 2006 to May 2007 to corroborate the results of the first experiment and to examine the growth rate of the juvenile population. The results showed that (a) the peak of incubation was from mid-January to mid-February, and the season of juvenile settlement was April to early June, which means that the duration of larval life in the ocean was about 2 months; (b) juveniles were distributed widely in the lagoon, and adults clustered to the west and south of the lagoon where the bed sediment was relatively fine with high ignition loss; (c) the survival rates of adults and juveniles in 1 year were 0.73 and 0.17, respectively, and the mean longevity of adults was about 3.7 years; (d) reproduction efficiency from eggs to juveniles was about 0.0040, which is much smaller than the survival rate of juveniles as well as adults, which means that the propagation of M. guinotae is mainly controlled by the condition that the larvae experience in the ocean.
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Summary: Impending Issues on Water Resource in Arid Region and Countermeasures
IRIE Mitsuteru
Journal of Arid Land Studies 27 ( 1 ) 23 - 24 2017
Language：Japanese Publishing type：Research paper (international conference proceedings) Publisher：The Japanese Association for Arid Land Studies
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Land cover mapping in cropland dominated area using information on vegetation phenology and multi-seasonal Landsat 8 images Reviewed
Mtibaa S., Irie M.
Euro-Mediterranean Journal for Environmental Integration 1 ( 1 ) 2016.12
Language：English Publishing type：Research paper (scientific journal)
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Evaluation of sediment solidification ability using in situ microbial functions in Ichkeul Lake, Tunisia Reviewed
Hata, T., Irie M.
Euro-Mediterranean Journal for Environmental Integration 1 ( 1 ) 2016.12
Language：English Publishing type：Research paper (scientific journal)
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Simulation of soil conservation measures using SWAT model: case of Joumine river basin, Tunisia
Mtibaa S., Irie M.
International Conference on African Large river basins Hydrology 2016.11
Language：English Publishing type：Research paper (international conference proceedings)
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Development of Water Turbidity Index (WTI) and turbidity estimation model using SMA application to Ichkeul Lake
Ouni H., Irie M., Kawachi A., Tarhouni J.
International Conference & Exhibition Advanced Geospatial Science & Technology 2016.10
Language：English Publishing type：Research paper (international conference proceedings)
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Study On River Flooding Control For Agricultural Development On The Flood Plain of Senegal River, Mauritania
2016.8
Language：English Publishing type：Research paper (international conference proceedings)
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Fabrication of porous ceramics by Gelcasting method with agar and reservoir sediment in Tunisia
Arioka Y., Sensui M., Fuji M., Tafu M., Kawakami T., Irie M.
9th International Conference on High Temperature Ceramic Matrix Composites and Global Forum on Advanced Materials and Technologies for Sustainable Development 2016.6
Language：English Publishing type：Research paper (international conference proceedings)
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Experimental study on the valorization of dredged sediment from reservoirs in Tunisia as soil amendment regulating metal uptake by crops Reviewed
Mtibaa S., Belkhamsa N., Irie M., Ksibi M.
International Journal of Environmental Science and Development 7 ( 10 ) 707 - 714 2016.2
Language：English Publishing type：Research paper (scientific journal)
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Development of Original Attachment and Application Software for Simple Fluoride Analysis using Smart Device Reviewed
Manaka A., Ichida T., Nakamura T., Furuyama S., Satoda M., Tafu M., Irie M. and Igarashi S.
Modern Environmental Science and Engineering 2016.2
Language：English Publishing type：Research paper (scientific journal)
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Modeling of thermal stratification and the effect on water quality in four reservoirs in Tunisia
Nsiri I., Tarhouni J., Irie M.
Journal of Hydrogeology & Hydrilogic Engineering 5 ( 1 ) 2016.2
Language：English Publishing type：Research paper (scientific journal)
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Dam gate operation for turbid flood water venting in the reservoir in Tunisia Reviewed
Shintake M. and Irie M.
Journal of Arid Land Studies 25 ( 3 ) 149 - 152 2015.12
Language：English Publishing type：Research paper (scientific journal)
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Numerical simulation of the inundation on the flood plain of Senegal River for the improvement of the agricultural productivity in Mauritania Reviewed
Ould Ahmed B. and Komatsu S.
Journal of Arid Land Studies 25 ( 3 ) 121 - 124 2015.12
Language：English Publishing type：Research paper (scientific journal)
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チュニジア国Joumine貯水池底泥を対象としたイシュケウル湖の湖底環境復元技術の適用性評価 Reviewed
畠俊郎，入江光輝
土木学会論文集G（環境） 71 ( 4 ) 125 - 133 2015.11
Language：Japanese Publishing type：Research paper (scientific journal)
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FEASIBILITY STUDY OF THE ICHKEUL LAKE ENVIRONMENTAL REMEDIATION TECHNOLOGY BY USING THE JOUMINE WATER RESERVOIR SEDIMENTS
HATA,Toshiro;IRIE,Mitsuteru
PROCEEDINGS OF ENVIRONMENTAL AND SANITARY ENGINEERING RESEARCH 71 ( 4 ) 125 - 133 2015
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
In this paper, the effect of recycling Joumine water reservoir sludge for strength improvement of the bottom of the Ichkeul lake sediment using the natural ecosystem is evaluated, with a focus on the remediation of National Heritage Ichkeul National Park in Tunisia. The goals of strength improvements are to minimize erosion from sea waves and enable marine organism growth. The main conclusions of this study are as follows. 1) The Joumine water reservoir sludge ecosystem can be enhanced by improving sludge strength. 2) A crystallization of the calcite in the Joumine water reservoir ecosystem is promoted by adding urea and calcium chloride. 3) The proposed techniques can be implemented to improve the benthos growth.
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Water reservoir as resource of raw material for ceramic industry
Irie M., Tarhouni J.
Journal of Physics: Conference Series 596 ( 1 ) 2015
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Physics: Conference Series
The industries related to the ceramics such as construction bricks, pottery and tile are the important sectors that cover the large part of the working population in Tunisia. The raw materials, clay or silt are excavated from opencast site of limestone clay stratum. The opencast site give the negative impact on landscape and environment, risks of landslide, soil erosion etc. On the other hand, a most serious problem in water resource management, especially in arid land such as Tunisia, is sedimentation in reservoirs. Sediment accumulation in the reservoirs reduces the water storage capacity. The authors proposed the exploitation of the sediment as raw material for the ceramics industries in the previous studies because the sediment in Tunisia is fine silt. In this study, the potential of the water reservoirs in Tunisia as the resource of the raw material for the ceramics industries is estimated from the sedimentation ratio in the water reservoirs.
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Meteorological data generation for the numerical simulation of stratified flow in the Joumine reservoir, Tunisia Reviewed
T. Ishikawa, K. Takahira, M. Wang, M. Irie, T. Nakamura
Journal of Environmental Science and Engineering B3 173 - 180 2014.11
Language：English Publishing type：Research paper (scientific journal)
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Issue of surface water resources and alternative solutions
Irie M., Tarhouni J.
Sustainable North African Society: Exploring Seeds and Resources for Innovation 139 - 148 2014.10
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Sustainable North African Society: Exploring Seeds and Resources for Innovation
© 2015 by Nova Science Publishers, Inc. All rights reserved. Surface water resources in Tunisia, which cover half of the water supply of this country, have problems such as environmental impact, flooding and reduction of sustainability due to sedimentation. These issues must be controlled with careful management with the understanding of the phenomena in the field in detail. What happened in the fields is changed depending on the condition of each environment. In addition to the technical discussion, implementation and spread of the technology to society should be carried out with the quantitative evaluation of its benefits to enlighten the society. This chapter introduces the situation of the surface water resources in Tunisia, which is the problem, and the reasons and alternatives of practical solutions, including the point of view of economical feasibility, etc.
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Research and education activities in ARENA
Kawachi A., Morio T., Irie M., Iwasaki M., Kashiwagi K., Isoda H.
Sustainable North African Society: Exploring Seeds and Resources for Innovation 299 - 306 2014.10
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Sustainable North African Society: Exploring Seeds and Resources for Innovation
© 2015 by Nova Science Publishers, Inc. All rights reserved. After its foundation, ARENA has rapidly extended its research and education activities in interdisciplinary approach involving life sciences, energy and environment, humanities and social sciences, and ICT and innovation. In this chapter, we describe the outline of development and expansion of research and educational activities of ARENA, focusing on 2007 to 2013. The research projects, starting from exploration of bioresources, have developed to comprehensive and interdisciplinary research based on exploration of bio-, water- and energy resources considering local cultural context of Islamic world and contribution to regional development through establishment of a framework of innovation. For education, mutual student exchange is extending beyond North Africa involving Europe and Middle East.
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Morphological effect of flood water pathway in reservoirs on the distribution of sedimentation
Ines N., Jamila T., Mitsuteru I., Hassen B.
Journal of Urban and Environmental Engineering 8 ( 2 ) 192 - 197 2014.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Urban and Environmental Engineering
© 2014 Journal of Urban and Environmental Engineering (JUEE). All rights reserved. In the North Africa countries, sediments deposition in the reservoir dams reduces the available surface water resources by 2 to 5% per year. In Tunisia, even many efforts are made to protect reservoir dams against soil erosion, the sedimentation still very important and constitute a limitation their time duration. In order to better understand these phenomena, bathymetry, turbidity, suspended soil particles and sediments were monitored for two reservoir dams in Tunisia: Joumine and Sejnane. These data will be interpreted in order to better characterize the sedimentation process and identify the determinant factors. Geostatistical Technics are applied to the bathymetric data in order to simulate the evolution, in time and in space, of the morphology of the reservoir dams and to estimate the distribution of the sediments deposits. The results for the two dams will permit to better understand the influence of the initial geometry of the reservoir dams on the sedimentation process and to deduce the main water flow path lines. Turbidity, suspended particles and sediments particles size profiles established for fixed stations in the reservoir dams will be interpreted in order to better understand the sedimentation process in the reservoirs dams and to characterize the influence of the initial reservoir geometry.
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In Vitro Testing and Commercialization Potential of Extracted Fulvic Acid from Dredged Sediment from Arid Region Reservoirs Reviewed
Irie, Mitsuteru; Han, Junkyu; Kawachi, Atsushi; Tarhouni, Jamila; Ksibi, Mohamed; Kashiwagi, Kenichi; Isoda, Hiroko
WASTE AND BIOMASS VALORIZATION 5 ( 2 ) 273 - 281 2014.4
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：SPRINGER
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変色反応に基づく目視分析のためのデバイスの作製と性能評価
間中淳, 坂上千尋, 佐藤祐, 五十嵐淑郎, 袋布昌幹, 入江光輝
Journal of Ecotechnology Research 17 ( 2 ) 95 - 98 2014.2
Language：English Publishing type：Research paper (scientific journal)
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チュニジア国Joumine貯水池の成層流動シミュレーションのための計算条件設定 Reviewed
高比良翔, 中村恭志,石川忠晴, 入江光輝, J. Tarhouni 他1名
土木学会論文集, B1 69 ( 4 ) 835 - 840 2013.3
Language：English Publishing type：Research paper (scientific journal)
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Observation of floodwater behavior and sedimentation in the reservoir Reviewed
M. Irie, A. Kawachi, I. Nsiri, J. Tarhouni
Journal of Japan Society of Civil Engineering, Ser. B1 69 ( 4 ) 247 - 252 2013.3
Language：English Publishing type：Research paper (scientific journal)
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Sustainable design of sanitation system based on material and value flow analysis for urban slum in Indonesia
Ushijima, Ken;Irie, Mitsuteru;Sintawardani, Neni;Triastuti, Jovita;Hamidah, Umi;Ishikawa, Tadaharu;Funamizu, Naoyuki
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING 7 ( 1 ) 120 - 126 2013.2
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：HIGHER EDUCATION PRESS
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Quasi-Real-Time Monitoring of a Citrus Field in Nabeul and Joumine Dam in Tunisia
Doi, R.;Ito, T;Irie, M.;Tarhouni, J.;and, Mizoguchi M.
Journal of Sustainable Watershed Science & Management 1 ( 3 ) 84-89 2013
Language：Japanese Publishing type：Research paper (scientific journal)
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Observation of floodwater behavior and sedimentation in the reservoir
Irie, M.;Kawachi, A.;Nsiri, I.;Tarhouni, J.
Journal of Japan Society of Civil Engineering, Ser. B1 69 ( 4 ) 247-252 2013
Language：Japanese Publishing type：Research paper (scientific journal)
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Assessment of wastewater-irrigated soil containing heavy metals and establishment of specific biomarkers
Ben, Fredj F.;Han, J.;Irie, M.;Funamizu, N.;Ghrabi, A.;H., Isoda
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 84 54 - 62 2012.10
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：ACADEMIC PRESS INC ELSEVIER SCIENCE
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Feasibility of exploitation of the sediment in the reservoirs for the sustainability of surface water resource in Tunisia Reviewed
M. Irie, K. Kashiwagi, K. Ujiie, I. Nsiri, S. Bouguerra, J. Tarhouni
Journal of Japan Society of Civil Engineering Ser.G 68 ( 6 ) 41 - 46 2012.9
Language：English Publishing type：Research paper (scientific journal)
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Amelioration effect of humic acid extracted from solubilized excess sludge on saline-alkali soil
Motojima, Hideko;Yamada, Parida;Irie, Mitsuteru;Ozaki, Masuo;Shigemori, Hideyuki;Isoda, Hiroko
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT 14 ( 3 ) 169 - 180 2012.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：SPRINGER
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Sensitivity of in-vitro bioassays towards several water origins in Tunisian Arid and Semi-arid Area Reviewed
F. Ben Fredj, M. Irie, J. Han, A. Liman, A. Ghrabi 他1名
Journal of Arid Land Studies 22 ( 1 ) 319 - 322 2012.6
Language：English Publishing type：Research paper (scientific journal)
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Soil amendment by sediment from water storage reservoir as a restoration technique in secondary treated wastewater irrigated area at El Hajeb region Reviewed
S. Mtibaa, M. Irie, M. Ksibi, H. Trabelsi, O. Hentati 他2名
Journal of Arid Land Studies 22 ( 1 ) 315 - 318 2012.6
Language：English Publishing type：Research paper (scientific journal)
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Characterization of Humic Substances in Sediment on Joumine Reservoir in Tunisia
KAWACHI,Atsushi;YAMADA,Parida;IRIE,Mitsuteru;ISODA,Hiroko
Journal of arid land studies 22 ( 1 ) 49 - 52 2012.6
Language：Japanese Publishing type：Research paper (scientific journal)
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Soil Amendment by Sediment from Water Storage Reservoir as a Restoration Technique in Secondary Treated Wastewater Irrigated Area at El Hajeb Region (Sfax-Tunisia)
MTIBAA,Slim;IRIE,Mitsuteru;HENTATI,Olfa;TRABELSI,Habib;KALLEL,Monem;KSIBI,Mohamed;ISODA,Hiroko
Journal of arid land studies 22 ( 1 ) 315 - 318 2012.6
Language：Japanese Publishing type：Research paper (scientific journal)
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Sedimentation Trend and Behavior of Turbid Water in the Reservoir
IRIE,Mitsuteru;KAWACHI,Atsushi;TARHOUNI,Jamila;GHRABI,Ahmad;ISODA,Hiroko
Journal of arid land studies 22 ( 1 ) 91 - 94 2012.6
Language：Japanese Publishing type：Research paper (scientific journal)
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モーリタニアにおける農業生産力向上の可能性について Reviewed
入江光輝, B. Ould Afmed, 安部征雄, 八幡暁彦
沙漠研究 21 ( 4 ) 143 - 154 2012.3
Language：English Publishing type：Research paper (scientific journal)
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Development of sedimentation and characteristics of sediment on the reservoir in Tunisia
Irie, M.;Kawachi, A.;Tarhouni, J.;Ghrabi, A.
Journal of Japan Society of Civil Engineers, Ser. B1 67 ( 4 ) 163-168 2012.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Civil Engineering
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Strength evaluation of construction bricks made from reservoir sediment and its economical feasibility for sustainable water resource management
Mitsuteru, Irie;Jamila, Tarhouni
The 2nd Algeria-Japan Academic Symposium 2012.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Metal uptake by Bromus ramosus in soil amended by sediment from water storage reservoir: Implications for remediation
Mtibaa, S.;Irie, M.;Ksibi, M.
The 11th Tunisian Japanese Symposium on Science, Society and Technology 2012.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Interpolation of depth data measured continuously by sounding sonar and estimation of sedimentation in reservoirs
Nsiri, I.;Irie, M.;Tarhouni, J.
The 11th Tunisian Japanese Symposium on Science, Society and Technology 2012.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Exploitation of Reservoir Sediment to Construction Brick Industry for Sustainable Water Resource Management
Mitsuteru, IRIE;Ines, NSIRI;Sana, BOUGUERRA;Atsushi, KAWACHI;Jamila, TARHOUNI
The 1st Morocco-Japan Symposium -Sustainable Society through Advanced Science- 2012.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Economical potentiel of exploitation of reservoir sediment to the production of construction brick
Bouguerra, S.;Irie, M.;Tarhouni, J.
The 11th Tunisian Japanese Symposium on Science, Society and Technology 2012.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Feasibility of Exploitation of the Sediment in the Reservoirs for the Sustainability of Surface Water Resource in Tunisia
Mitsuteru,IRIE;Kenichi,KASHIWAGI;Kiyokazu,UJIIE;Ines,NSIRI;Sana,BOUGUERRA;Jamila,TARHOUNI
PROCEEDINGS OF ENVIRONMENTAL AND SANITARY ENGINEERING RESEARCH 68 ( 6 ) II_41 - II_46 2012
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
Sedimentation occupies the storage capacity of reservoirs and reduces the amount of available surface water resource. The countermeasure to the sedimentation is required especially in arid land where the land erosion is very severe due to low vegetation in the catchment area, and even fine particles are deposited because of the low water rotation of the reservoirs under the climatic condition of clear difference between rainy season and drought season. However, it has not been carried out because the conventional technologies against the sedimentation, such as dredging or bypass for sediment inflow, are quite costly. The authors proposed the exploitation idea which can valorize the sediment and will financially assist the cost of dredging or other countermeasures to the sedimentation. One of the exploitation ways is producing construction bricks. Sediment in Tunisian reservoirs is fine and sticky clay or silt, so there is a potential of the material for producing ceramics. In this study, the current situation of the production of the construction bricks in Tunisia was surveyed; price of raw material, a wholesale price, market price, processing cost and material flow. This inform
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Development of sedimentation and characteristics of sediment on the reservoir in Tunisia Reviewed
M. Irie, A. Kawachi, J. Tarhouni, A. Ghrabi
Journal of Japan Society of Civil Engineering, Ser. B1 67 ( 4 ) 163 - 168 2011.3
Language：English Publishing type：Research paper (scientific journal)
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Preliminary survey on comprehensive biomass production plan utilizing sago palm resource in East Sepik Province, Papua New Guinea Reviewed
30) Irie M., Okawara R., Abe Y.
Sago Palm 18 ( 1 ) 19 - 27 2010.10
Language：English Publishing type：Research paper (scientific journal)
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Biomarkers of pollution in soils irrigated with wastewater in Tunisia Reviewed
Ben Fredj F., Irie M., Han J., Charef A, Ghrabi A. and Isoda H.
WIT Transactions on Ecology and the environment 5 435 - 446 2010.10
Language：English Publishing type：Research paper (scientific journal)
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現地に自生する雑草を活用したオンサイトバイオマス発電によるバイオ燃料生産の高効率化 Reviewed
入江 光輝， 大川原 良次， 荒巻 俊也，安部征雄
沙漠研究 20 ( 2 ) 109 - 117 2010.9
Language：Japanese Publishing type：Research paper (scientific journal)
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Preliminary Survey on a Comprehensive Biomass Production Plan Utilizing Sago Palm Resources in East Sepik Province, Papua New Guinea
IRIE,Mitsuteru;OKAWARA,Ryoji;MURANAKA,Akihiro;HIROTA,Makoto;ABE,Yukuo
Sago palm 18 ( 1 ) 19 - 27 2010.7
Language：Japanese Publishing type：Research paper (scientific journal)
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STRESS RESPONSE OF HEAVY METAL MIXTURE PRESENT IN WASTEWATER AND LEACHATE ON HEAT-SHOCK PROTEIN 47-TRANSFECTED CELLS
Ben, Fredj Fahmi;Irie, Mitsuteru;Han, Junkyu;Yamada, Parida;Limam, Atef;Ghrabi, Ahmed;Morio, Takahiro;Isoda, Hiroko
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 29 ( 7 ) 1637 - 1647 2010.7
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：SETAC PRESS
DOI： 10.1002/etc.178
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Preliminary survey on comprehensive biomass production plan utilizing sago palm resource in East Sepik Province, Papua New Guinea Reviewed
Mitsuteru, Irie;Ryoji, Okawara;Akihiro, Muranaka;Makoto, Hirota;Yukuo, Abe
Sago Palm 18 ( 1 ) 19-27 2010.6
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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Biomarkers of pollution in soils irrigated with wastewater in Tunisia
F., Ben Fredj;M., Irie;J., Han;A., Charef;A., Ghrabi;H., Isoda
WIT Transactions on Ecology and the Environment 140 2010.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：WIT Press
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Environmental risk assessment of water resources in arid and semi-arid lands using bioassays systems Reviewed
Ben Fredj F., Irie M., Han J, Yamada P., Limam A.
Journal of Arid Land Studies 19 ( 1 ) 261 - 264 2009.12
Language：English Publishing type：Research paper (scientific journal)
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Feasibility of wild grass exploitation for bio fuel production Reviewed
Irie M., Okawara R., Abe Y.
Journal of Arid Land Studies 19 ( 1 ) 9 - 12 2009.12
Language：English Publishing type：Research paper (scientific journal)
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Study on hydrological conditions for the conservation of nesting habitat of red-crowned crane in Xianghai Wetlands, China Reviewed
He C., Ishikawa T., Sheng L. and Irie M.
Hydrological Processes 23 612 - 622 2009.10
Language：English Publishing type：Research paper (scientific journal)
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Environmental risk assessment of water resources in arid and semi-arid lands using bioassays systems
Ben, Fredj F.;Irie, M.;Han, J;Yamada, P.;Limam, A.;Ghrabi, A.;Isoda, H.
Journal of Arid Land Studies 19 ( 1 ) 261-264 2009.6
Language：Japanese Publishing type：Research paper (scientific journal)
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Advanced Processing of Useful Food Material for the Establishment of a Regional Development Model in Arid Areas
KASHIWAGI, Kenichi;ISODA, Hiroko;HAN, Junkyu;IRIE, Mitsuteru;NABETANI, Hiroshi;NAKAJIMA, Mitsutoshi
Journal of arid land studies 19 ( 1 ) 375 - 378 2009.6
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本沙漠学会
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Agricultural development for bio fuel production in Papua New Guinea
Mitsuteru, Irie
Proceedings of the 6th International Symposium on Sustainable Sanitation 54-57 2009.3
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Water Resource and Reuse in Tunisia
IRIE,Mitsuteru;ABE,Yukuo;ISODA,Hiroko
Journal of arid land studies 18 ( 4 ) 171 - 175 2009.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本沙漠学会
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He C., Ishikawa T., Sheng L., Irie M.
Hydrological Processes 23 ( 4 ) 612 - 622 2009.2
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Hydrological Processes
The hydrological condition of the Xianghai National Natural Reserve (XNNR) in China was studied in relation to the conservation of the breeding habitat of the Red-crowned crane, an endangered waterfowl species. In recent years, the condition of the cranes' habitat in XNNR has deteriorated due to shrinking of the wetlands caused by the increase of uncontrolled intake of river water. Because XNNR is located in a remote rural area, the condition of the cranes' habitat was not surveyed in detail, therefore, basic information about the wetlands such as, topographic and hydrological data were not fully available. As a result, a large amount of time is required to frame a detailed plan for the allocation of water resources for the conservation of the cranes. In order to progress, the 'precautionary approach' must be applied even without full scientific certainty (The Ramsar Convention on Wetlands, Resolution VIII.1, 2002), based on the information available at present, and in order to reach an agreement among stakeholders. For this purpose, the study took the following four steps. Firstly, field observations conducted over a period of seven years clarified that reed communities surrounded by a shallow water body were the favourable conditions for nesting. Secondly, Landsat-TM data analysis showed that the number of nests became stable when the reed area developed to some extent, and also that the reed area has a high correlation with the total water area in the XNNR. Thirdly, the variation of the total water area over 20 years were estimated from 143 analog images of Landsat data and its correlations with some basic hydrological factors were obtained by regression analyses. The final step involved combining the above mentioned results, which was then used to develop a practical guideline for the use of river water by the local community that is balanced with the conservation of the Red-crowned cranes. Copyright © 2008 John Wiley & Sons, Ltd.
DOI： 10.1002/hyp.7189
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Field research on domestic wastewater from a slum in Bandung City Reviewed
Ushijima K., Irie M., Sintawardani N., Triastuti J. and Ishikawa T.
Journal of Hydroscience and Hydraulic Engineering 26 129 - 140 2008.10
Language：English Publishing type：Research paper (scientific journal)
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バンドン市のスラム地区における屎尿コンポスト収集輸送システムの検討 Reviewed
牛島健, 入江光輝, Neni SINTAWARDANI, Jovita TURIASTUTI, 石川忠晴
環境工学論文集 44 505 - 511 2007.6
Language：Japanese Publishing type：Research paper (scientific journal)
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Promotive effects of pentakeep-v containing 5-aminolevulinic acid and trace elements on crops
Tanaka, T.;Watanabe, K.;WatanabeS.;Tanaka, T.;Takeuchi, Y.;Irie, M.;Abe, Y
8th TJASSST 2007, Kantaoui forum 10 2007.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Practical model of sustainable sanitation system for urban slum in Bandung
Ushijima, K.;Irie, M.;Sintawardani, N.;Triastuti, J.;Ishikawa, T.
Proceedings of the 5th International Symposium on Sustainable Sanitation 179-188 2007.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Design of Discharge from Horizontal well; Khattara
Irie, M
8th TJASSST 2007, Kantaoui forum 45 2007.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Characterization of Albizzia Sawdust from Bio-toilet and its utilization for Jatropha planting
Triastuti, J.;Sintawardani, N.;Irie, M.;Terasawa, M.
Proceedings of the 5th International Symposium on Sustainable Sanitation 7-14 2007.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Acceptability of dry toilet technology in Indonesia as an effort to improve sanitation condition
Sintawardani, N.;Triastuti, J.;Ishikawa, T.;Irie, M.
Proceedings of the 5th International Symposium on Sustainable Sanitation 189-194 2007.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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A Relationship between Tidal Current and Movement of Zoeal Larvae of crabs just after Releasing in Amparu Tidal Lagoon, Ishigaki Island, Okinawa, Japan
Kawachi, A.;Irie, M.;Ishikawa, T.
Proceeding of ISWS 2007 505-520 2007.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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中国吉林省・向海湿地における丹頂鶴営巣の水文的条件について Reviewed
何春光，石川忠晴，入江光輝，盛連喜, 王升忠
水工学論文集 50 1129 - 1134 2006.3
Language：Japanese Publishing type：Research paper (scientific journal)
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バンドン市のスラム地区における生活排水の現地調査 Reviewed
牛島健，入江光輝，Neni SINTAWARDANI，Jovita TURIASTUTI，石川忠晴
水工学論文集 50 1075 - 1080 2006.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Trial design of bio-toilet for vast reduction of expenses
Kitamura, H.;Irie, M.;Ushijima, K.;Ishikawa, T.;;Takahashi.M
Proceedings of the 4th International Symposium on Sustainable Sanitation 330-339 2006.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Estimation of bio-toilet application effect on kampong area in Bandung and case study on maintenance planning following present garbage collection system
Irie, M.;Ushijima, K.;Sintawardani, N.;Triastuti, J.;;Ishikawa, T.
Proceedings of the 4th International Symposium on Sustainable Sanitation 245-255 2006.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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A field study on the exchange of plant leaves between AMPARU Tidal Flat and the sea
Kawachi, A.;Irie, M.;;T., Ishikawa
Proceedings of the 15th APD of IAHR 995-1002 2006.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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石垣島アンパル干潟に優占して生息する数種類のカニの生息環境について Reviewed
入江光輝，河内敦，石神卓美，石川忠晴
環境システム論文集 33 55 - 62 2005.10
Language：Japanese Publishing type：Research paper (scientific journal)
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石垣島アンパル干潟における巣穴数計測によるカニ類の生息分布の評価と考察 Reviewed
石神卓美， 入江光輝， 石川忠晴
水工学論文集 49 1489 - 1494 2005.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Study on Habitat of Crabs on Amparu Tidal Lagoon
Irie, M.;Kawachi, A.;T., Ishikawa
Abstract of XXXI IAHR Cong. 2005 1994-2002 2005.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Feasibility of introducing the bio-toilet to decrease t he water pollution in an open canal-A case study in Kiaracondong slum area in Bandung City-
Sintawardani, N.;Irie, M.;Triastuti, J.;Ishikawa, T.;M., Affendi
Future of Urban Wastewater System-Decentralization and Reuse, Proc. of the Int. Water Assoc. Conf. 2005, Xian 101-110 2005.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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Dynamics of Suspended Sediment in A Tidal Lagoon During Flood
Akamatsu, Y.;Irie, M.;T., Ishikawa
Abstract of XXXI IAHR Cong. 2005 2162-2171 2005.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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A Preliminary Experiment On The Use of Sawdust Toilet At Ordinary Home In Japan
Ushijima, K.;Irie, M.;T., Ishikawa
Future of Urban Wastewater System-Decentralization and Reuse, Proc. of the Int. Water Assoc. Conf. 2005, Xian 71-78 2005.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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浮体型曳航器の試作とテスト
入江光輝，石川忠晴
水工学論文集 48 751 - 756 2004.3
Language：Japanese Publishing type：Research paper (scientific journal)
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利根川感潮域における乱流と底泥の巻き上げに関する現地観測 Reviewed
清水健司， 入江光輝， 石川忠晴
水工学論文集 48 769 - 774 2004.3
Language：Japanese Publishing type：Research paper (scientific journal)
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北上川融雪出水による追波湾の低塩分化について Reviewed
石川忠晴， 工藤健太郎， 坂井洋平， 入江光輝， 李炫錫
水工学論文集 48 1225 - 1230 2004.3
Language：Japanese Publishing type：Research paper (scientific journal)
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A field study on near-bottom turbulence and resuspension of fine sediment in Tone River Estuary
Shimizu, K.;Ishikawa, T.;M., Irie
Proc. 13th congress the APD/IAHR 2004.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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生活に使用されている井戸の水位変動記録に基づく地盤透水係数の鉛直分布の推定 Reviewed
入江光輝，関口由起江，石川忠晴
水文水資源学会誌 12 470 - 480 1999.10
Language：Japanese Publishing type：Research paper (scientific journal)
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水平飽和浸透と鉛直不飽和浸透を可変境界で接合した疑似二次元浸透流計算について Reviewed
入江光輝，鈴木伴征，石川忠晴
水工学論文集 43 181 - 186 1999.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Restoration of Hydrological Cycle in the Izumi River Basin in Yokohama
Ishikawa, T.;Irie, M.;Terashima, T.;Ozawa, K.;M., Imbe
Proc. of 8th Int. Conf., Urban Storm Grainage, Sydney 530-537 1999.1
Language：Japanese Publishing type：Research paper (international conference proceedings)
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鉛直不飽和浸透流計算における飽和・不飽和域の接合に関する数学的処理について Reviewed
鈴木伴征，入江光輝，石川忠晴
土木学会論文集 593 11 - 19 1998.5
Language：Japanese Publishing type：Research paper (scientific journal)
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洪水採水用簡易採水装置の試作とテスト Reviewed
入江光輝，若岡圭子，小澤啓明，石川忠晴
水工学論文集 40 1145 - 1149 1996.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Trial Production and Test of a New Equipment for Sampling Flood Water in Small Urban. Rivers
Irie, M.;Ozawa, H.;Wakaoka, K.;;T., Ishikawa
Proc. of 10th Congress of the APD-IAHR 1 244-251 1996.1
Language：Japanese Publishing type：Research paper (international conference proceedings)