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農学部 森林緑地環境科学科 |
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准教授 |
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Gomez C., Hotta N., Shinohara Y., Park J.H., Tsunetaka H., Zhang M., Bradak B., Sri Hadmoko D., Budi Wibowo S., Daikai R., Yoshida M.
Journal of Applied Geophysics 209 2023年2月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Journal of Applied Geophysics
Volcanic gullies develop U-shape cross-profiles due to the lahars that shape them after eruptive events. Over time, the processes of sediment-transfer change and the erosion of sub-vertical walls become a leading process. It results in debris-cones at their foot. However, the processes that generate these landforms is still unclear. Indeed, the surface is the one of a cone or a “steep debris-fan”, but are these diffusive landforms starting through progressive regressive-erosion of the wall, or do they follow an original collapse? This we do not know, and as the material is poorly-sorted with a mixture of unconsolidated fine sands to large clasts, digging a trench is not possible as it destroys the material structure. Therefore, the present contribution aims to define the development mechanisms of the side-wall debris-cones using Ground Penetrating Radar imaging, working in the Tansandani Gully at Unzen Volcano (Japan). The GPR used in the study is a Mala Ramac Pro-Ex mounted with a 500 MHz shielded antenna. The GPR signal penetrated up to 4–5 m depth and the velocity was homogeneous on average through the different material layers and at the different location, although at depth variations occurred. The structure of the units in the radargrams present units' parallel to the surface for the first 40 to 60 cm, with underneath the presence of more irregular prograding units, with eventually underneath a set of units that are structureless and often rich in blocks. The two lower structureless-units are not always present and one of the debris-cone only showed a set of rough subparallel units. This differences are the result of the debris-cones being generated by (1) at first a wall collapse or by rapid water-borne processes creating (2) bulk prograding units, which have to be put in place during a heavy-rainfall event. Finally, near the surface, the (3) thin subparallel units are most probably post-rainfall deposition, resulting from gravity process in dry-material. This can be inferred because there is no evidence of erosion or remobilization in layers and the process has been observed in the field. For the observed debris-cones, their formation is dominated by a wall collapse, which is then recovered by finer-grained units deposited sub-horizontally to the surface.
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The Role of Citrus Groves in Rainfall-Triggered Landslide Hazards in Uwajima, Japan 査読あり 国際共著
Lusiana N., Shinohara Y.
Water (Switzerland) 14 ( 13 ) 2022年7月
担当区分：責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Water (Switzerland)
Landslides often cause deaths and severe economic losses. In general, forests play an important role in reducing landslide probability because of the stabilizing effect of the tree roots. Although fruit groves consist of trees, which are similar to forests, practical land management, such as the frequent trampling of fields by laborers and compression of the terrain, may cause such land to become prone to landslides compared with forests. Fruit groves are widely distributed in hilly regions, but few studies have examined their role in landslide initiation. This study aims at filling this gap evaluating the predisposing and triggering conditions for rainfall-triggering landslides in part of Uwajima City, Japan. A large number of landslides occurred due to a heavy rainfall event in July 2018, where citrus groves occupied about 50% of the study area. In this study, we combined geodata with a regression model to assess the landslide hazard of fruit groves in hilly regions. We developed maps for five conditioning factors: slope gradient, slope aspect, normalized difference vegetation index (NDVI), land use, and geology. Based on these five maps and a landslide inventory map, we found that the landslide area density in citrus groves was larger than in forests for the categories of slope gradient, slope aspect, NDVI, and geology. Ten logistic regression models along with different rainfall indices (i.e., 1-h, 3-h, 12-h, 24-h maximum rainfall and total rainfall) and different land use (forests or citrus groves) in addition to the other four conditioning factors were produced. The result revealed that “citrus grove” was a significant factor with a positive coefficient for all models, whereas “forest” was a negative coefficient. These results suggest that citrus groves have a higher probability of landslide initiation than forests in this study area. Similar studies targeting different sites with various types of fruit groves and several rainfall events are crucial to generalize the analysis of landslide hazard in fruit groves.
DOI： 10.3390/w14132113
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Iwasaki K., Nanko K., Nakata Y., Masaka K., Shinohara Y., Nitta K., Mizunaga H.
Ecological Engineering 180 2022年7月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Ecological Engineering
Coastal forests are critical for protecting those living near the sea from wind, blown sand, salt spray, and tsunami. However, the sustainability of the coastal forest ecosystem is threatened by coastal erosion. To reveal the impact of erosion on coastal forest growth, we focused on the changes in coastal topography caused by port construction. The coastline has been advancing at the near side of a constructed port from the estuary (east) and retreating at the opposite (west) side since the 1980s in Ishikari, Japan. We conducted a transect survey, stem analysis, salt adhesion observation, and remote sensing analysis using airborne laser imaging detection and ranging data as well as an unmanned aerial vehicle. Results showed that the basal-area–weighted mean tree height in the east side was higher than that in the west side in 2019 and has increased by 2.82 m over the last 17 years. The tree height growth rate after the 2000s decreased in the west side, whereas the vigorous growth rate in the east side was maintained. The recent deposition of blown sand on the embryo dune was also detected on the east side. In contrast, the foredune was eroded, and the canopy height growth was inhibited toward several hundreds of meters inland from the seaward forest edge on the west side. The foredune erosion expanded from the point where the vegetation was destroyed, indicating the relevance of foredune vegetation in mitigating it. During winter, salt adhesion was higher in the eroded area, inhibiting canopy height growth. The most useful topographic variable to explain the spatial variability of the canopy height growth was the relative change in the cross-sectional area of the beach and dune upwind of the forest. These findings highlight the importance of monitoring vertical topographic changes in beach and foredune to evaluate the impact of coastal erosion on forest growth through airborne salt stress.
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Shinohara Y., Kume T.
Science of the Total Environment 827 154392 - 154392 2022年6月
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Science of the Total Environment
Landslides are natural hazards that cause severe damage and human losses. Japan has succeeded in reducing the number of landslide fatalities and is one of the few countries with long-term databases of landslide fatalities. In this study, we identified the factors that contributed to the decrease in fatalities associated with rainfall-triggered landslides in Japan between 1945 and 2019. We examined trends in landslide fatalities and six factors for Periods I, II, III, IV, and V—each period spans 15 years of the study period—and for Periods I–II, II–III, III–IV, and IV–V. We examined the trends in the number of landslides (NL) and in the ratio between the number of fatalities (NF) and the number of landslides (NF/NL), and considered fatalities as the product of the number of landslides and the probability of fatalities. The number of fatalities decreased continuously between Periods I and IV; the rate of the decrease declined over time. During Period I–II, NF/NL decreased, whereas NL remained unchanged. Decreases in the average number of household members, changes in building structure, and increases in the number of people evacuated may have contributed to the decrease in NF/NL. During Periods II–III and III–IV, NL also decreased. During Period II–III, the area of mature forests increased slowly. During Period III–IV, the implementation of structural measures (i.e., hard measures) was aggressively pursued. The factors that contributed to the decrease in landslide fatalities changed with time, suggesting that measures for reducing landslide fatalities changed according to the degree of maturity of the nation. Furthermore, we identified increases in rainfall and NL in Period V, which might indicate a future increase in landslide fatalities.
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Jeong S., Kume T., Shinohara Y., Farahnak M., Otsuki K.
Forests 13 ( 5 ) 2022年5月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Forests
Interception loss (IL) by the forest canopy removes a substantial quantity of rainwater within forested ecosystems. The large-scale unmanaged Japanese coniferous plantations with high stand density (SD) in Japan raise concerns about an additional increasing IL as a result of a new influential factor of dead branches under canopies. Thus, evaluating the usage of IL estimation models is vital to regulating the water and environment in such coniferous plantations. This study aimed to examine the applicability of the reformulated Gash analytical model (RGAM) to unmanaged coniferous plantations with high SD laden with dead branches. We established two plots (P1 and P2) laden with dead branches under the same SD of 2250 stems ha−1 but with different numbers of dead branches (56 vs. 47 branches per tree) in an unmanaged Japanese coniferous plantation. Results demonstrated that a large difference was found in canopy storage capacity (S) in P1 and P2 (3.94 vs. 3.25 mm), which was influenced by the different number of dead branches; therefore, the IL ratio to gross rainfall differed considerably (32.7% in P1 and 26.7% in P2) regardless of the SD being the same. The difference in S enables the RGAM to reflect the influence of dead branch structures on IL, leading to an acceptable RGAM performance for both P1 and P2 (“fair” IL relative errors: −20.2% vs. −16.1%) in the present study of unmanaged coniferous plantations with high SD laden with dead branches.
DOI： 10.3390/f13050657
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森林水文学入門
篠原慶規（ 担当： 分担執筆 , 範囲: 蒸発散）
朝倉書店 2022年9月
記述言語：日本語 著書種別：教科書・概説・概論
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森林学の百科事典
篠原 慶規（ 担当： 共著）
丸善出版 2021年1月
総ページ数：694 担当ページ：災害防止と保安林（第13章 森林と災害） 記述言語：日本語 著書種別：事典・辞書
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The necessity of sensor calibration for the precise measurement of water fluxes in forest ecosystems. IN Forest-Water Interactions
Shin'ichi Iida, Takanori Shimizu, Yoshinori Shinohara, Shin'ichi Takeuchi, Tomo'omi Kumagai（ 担当： 共著）
Springer Nature 2020年2月
総ページ数：643 担当ページ：519-536 記述言語：英語 著書種別：学術書
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The July 2020 Rainfall-Induced Sediment Disasters in Kumamoto Prefecture, Japan
JITOUSONO Takashi, SHINOHARA Yoshinori, SHIMIZU Osamu, TAGATA Satoshi, TERAMOTO Yukiyoshi, TORITA Eiji, NAGATANI Naomasa, NAKANO Koji, NISHIWAKI Ayato, HIRAKAWA Yasuyuki, FUKUZUKA Kozaburou, IGURA Mari, MIZUNO Hideaki, UE Hirotaka, OHISHI Hiroyuki, KAKIMOTO Tsuyoshi, KITOU Ken-ichi, KOGA Syozo, SAKAI Yusuke, SAKASHIMA Toshihiko
砂防学会英文誌 13 ( 4 ) 93 - 100 2021年4月
記述言語：英語 掲載種別：記事・総説・解説・論説等（学術雑誌） 出版者・発行元：公益社団法人 砂防学会
On July 4, 2020, heavy rainfall was observed in the southern part of Kumamoto Prefecture and the northern part of Kagoshima Prefecture. Due to heavy rainfall, floods and sediment disasters such as collapses and debris flows occurred predominantly in the Kuma River basin of Kumamoto Prefecture. We conducted field investigations at four sites in Ashikita Town and Tsunagi Town, Kumamoto Prefecture, where collapses and debris flows caused deaths. We also conducted field investigations in the Kawauchi River branch of the Kuma River, where vast amounts of sediment discharge caused damage to houses. The objectives of these investigations were to clarify the situation and mechanism of the disasters and to propose procedures to recover from the disasters. This report briefly summarizes the results of these investigations.
DOI： 10.13101/ijece.13.93
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地頭薗 隆, 篠原 慶規, 清水 収, 田方 智, 寺本 行芳, 鳥田 英司, 永谷 直昌, 中濃 耕司, 西脇 彩人, 平川 泰之, 福塚 康三郎, 伊倉 万理, 水野 秀明, 植 弘隆, 大石 博之, 垣本 毅, 木藤 賢一, 古賀 省三, 坂井 佑介, 坂島 俊彦
砂防学会誌 73 ( 4 ) 41 - 50 2020年
記述言語：日本語 掲載種別：速報，短報，研究ノート等（学術雑誌） 出版者・発行元：公益社団法人 砂防学会
On July 4, 2020, heavy rainfall was observed in the southern part of Kumamoto prefecture and the northern part of Kagoshima prefecture. Due to the heavy rainfall, floods and sediment disasters such as landslides and debris flows were occurred especially in the Kuma River basin of Kumamoto prefecture. We conducted field investigations at four sites in Ashikita-town and Tsunagi-town, Kumamoto prefecture, where landslides and/or debris flows caused deaths. We also conducted field investigations in the Kawauchi River branch of the Kuma River where huge amounts of sediment discharge caused damage to houses. The objectives of these investigations were to clarify the situation and mechanism of the disasters and to propose procedures to recover from the disasters. This report briefly summarizes the results in these investigations.
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大規模土砂移動に伴う災害の特徴整理と影響範囲の予測および対策に向けた課題 査読あり
今泉 文寿，堤 大三，中谷 加奈，権田 豊，逢坂 興宏，福山 泰治郎，宮田 秀介，篠原 慶規，水野 秀明，原田 紹臣，水野 正樹
砂防学会誌 70 ( 1 ) 20 - 30 2017年5月
記述言語：日本語 掲載種別：記事・総説・解説・論説等（学術雑誌）
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篠原 慶規
水文・水資源学会誌 30 ( 2 ) 126 - 126 2017年
記述言語：日本語 掲載種別：記事・総説・解説・論説等（学術雑誌） 出版者・発行元：水文・水資源学会
 本書は，小川滋先生が九州大学を2005年に退職された際，企画された2冊のうちの1冊である．「環境と生物」を基本テーマに，森林と水との関わり，森林の環境保全機能について網羅的に解説している。本書が取り扱うトピックスに興味を持った学生や，周辺分野の研究者が，基本的な知識，考え方を得るためにうってつけの書である．
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モウソウチク林の拡大が林地の公益的機能に与える影響:―総合的理解に向けて―
篠原 慶規, 久米 朋宣, 市橋 隆自, 小松 光, 大槻 恭一
日本森林学会誌 96 ( 6 ) 351 - 361 2014年
記述言語：日本語 掲載種別：記事・総説・解説・論説等（大学・研究所紀要） 出版者・発行元：日本森林学会
本研究では，既往の研究を整理することで，モウソウチク林拡大の実態，現存量を把握すると共に，モウソウチク林の拡大が，林地の水土保全に関する公益的機能を低下させる可能性について検証した。モウソウチク林の面積拡大は数多くの研究により報告されており，年間拡大率の平均は 1.03 ha/(ha year)であった。また，隣接する場所が開けている方が，開けていない場所と比較し，モウソウチク林の拡大速度が大きいことが示唆された。モウソウチク林の地上部現存量は，62.6～224.3 t/ha であり，その最大値はスギ林・ヒノキ林の最大値よりも小さいと予想された。一方，地下部現存量は研究例が少なく，今後のさらなる研究が必要である。林地の水土保全に関する公益的機能について既往の研究成果を取りまとめたところ，これまでの推察に反して，モウソウチク林は，他の森林タイプと比較し，洪水，渇水，表層崩壊，表面侵食のリスクが低いことが示唆された。しかし，この結論は十分な計測例に基づくものではない。今後，様々な林分条件，気象条件のモウソウチク林で数多くの計測が行われ，上記の結論を再検討することが望まれる。
DOI： 10.4005/jjfs.96.351
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令和4年台風第14 号による宮崎県の山地災害の特徴
篠原慶規，清水収
日本森林学会大会 2023年3月26日
開催年月日： 2023年3月25日 - 2023年3月27日
記述言語：日本語 会議種別：口頭発表（一般）
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海岸林における立木の成長は海岸線の進退に影響される —石狩海岸における港湾建設後の成長量変化—
岩崎健太・南光一樹・中田康隆・真坂一彦・篠原慶規・新田響平・水永博己
日本海岸林学会大会 2022年10月22日
開催年月日： 2022年10月
記述言語：日本語 会議種別：口頭発表（一般）
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The effect of Topographical changes on debris flow reduction at Mt. Unzen
Park JH, Shinohara Y, Hotta N, Gomez C
砂防学会研究発表会 2022年5月11日
開催年月日： 2022年5月
記述言語：英語 会議種別：口頭発表（一般）
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降雨による土砂災害発生件数の都道府県別の変動要因の解明
篠原慶規，渡邊優太
砂防学会研究発表会 2022年5月
開催年月日： 2022年5月
記述言語：日本語 会議種別：口頭発表（一般）
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Comparison of the occurrences of landslides between orange groves and forests on landslides induced by the heavy rainfall in 2018 in Uwajima City, Japan
Lusiana N, Shinohara Y
砂防学会研究発表会 2022年5月11日
開催年月日： 2022年5月
記述言語：英語 会議種別：口頭発表（一般）
科研費（文科省・学振・厚労省）獲得実績 【 表示 ／ 非表示 】
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土砂災害による死者数の時空間変動要因の解明
研究課題/領域番号：21K04590 2021年04月 - 2024年03月
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(C)
担当区分：研究代表者
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森林から河川へ流出する炭素量は吸収量に対してどの程度の割合なのか？
研究課題/領域番号：21H02238 2021年04月 - 2024年03月
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(B)
高木 正博、
担当区分：研究分担者
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地上計測とドローンを用いた高時空間分解能の森林蒸散量の推定
研究課題/領域番号：18K14492 2018年 - 2021年03月
科学研究費補助金 若手研究(B)
担当区分：研究代表者
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表層崩壊の危険性を評価する上で土壌水分の空間的不均一性は考慮する必要があるのか？
研究課題/領域番号：25850109 2013年04月 - 2016年03月
科学研究費補助金 若手研究(B)
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地球温暖化が森林蒸発散量,二酸化炭素固定量に与える影響の予測
研究課題/領域番号：08J07292 2008年04月 - 2011年03月
科学研究費補助金 特別研究員奨励費
その他競争的資金獲得実績 【 表示 ／ 非表示 】
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熱赤外カメラを用いた斜面崩壊時の湧水発生状況の把握
2018年04月 - 2019年03月
砂防学会 若手助成
担当区分：研究代表者 資金種別：競争的資金
受託研究受入実績 【 表示 ／ 非表示 】
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令和４年度火山噴火後の土砂流出継続期間の検討
2022年05月 - 2023年03月
国土交通省 九州地方整備局 一般受託研究
担当区分：研究代表者 受託研究区分：一般受託研究
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土石流発生域の地形的特徴を考慮した土砂生産モデルの構築
2020年05月 - 2021年03月
国土交通省九州地方整備局 一般受託研究
担当区分：研究代表者 受託研究区分：一般受託研究
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GCOM-C 陸圏プロダクトとしての全球蒸発散指数推定アルゴリズムの開発
2021年06月 - 2022年03月
国立研究開発法人宇宙航空研究開発機構 学内共同研究
担当区分：研究分担者 共同研究区分：国内共同研究