Faculty of Agriculture Department of Forest and Environmental Sciences


Associate Professor

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Degree 【 display / non-display

  • 博士(農学) ( 2001.3   東京大学 )

  • 修士(農学) ( 1998.3   東京大学 )

  • 学士(農学) ( 1996.3   東京大学 )

Research Areas 【 display / non-display

  • Life Science / Forest science


Papers 【 display / non-display

  • A study of relationship between mosaic-pattern forest and infrastructure in Morotsuka Village. Reviewed


    Kyushu Journal of Foest Research   73   5 - 10   2020.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Forest road planning using precision geographic data under climate change Reviewed

    Mika YOSHIDA, Rin SAKURAI and Hideo SAKAI

    International Journal of Forest Engineering   30   219 - 227   2018.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    Frequent heavy rainfall is suspected to cause failures on spur roads especially those constructed by earthworks . It is essential to construct robust, cost-efficient and well-maintained road networks to react to uncertain events. Laser imaging detection and ranging technology (LiDAR) can measure the topography. By constructing spur roads based on the watercourse map estimated from the digital elevation model taken by LiDAR, the change of watercourses could be followed by using LiDAR after construction and spur road failures were surveyed to evaluate the road planning process. The route was selected to avoid watercourses using stable points such as natural bench. The roads crossing the watercourses were protected from surface runoff by dispersal drainage systems. The route and dispersal drainage systems effectively prevented runoff from soil erosion from a cut slope. The height of the cut slope and the stability of the natural slope were key for routing and selecting drainage systems. Spur roads with functional dispersal drainage systems at appropriate places are expected to improve the ability of water conservation in mountainous forests, which could contribute to keeping them as the “green infrastructure” and adapting to climate change.

    DOI: 10.1080/14942119.2018.1498687

  • Productivity of loaders and forwarders in Japanese forestry operation conditions Reviewed

    Simon Berg, Mika Yoshida, Rin Sakurai and Hideo Sakai

    Journal of Forest Research   23 ( 3 )   149 - 155   2018.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    The harvesting costs in Japan need to be reduced to increase the wood supply. Detailed information about machine productivity facilitates the identification of the most cost-effective machines. Therefore, an IWAFUJI GS-65LJV grapple (GS65), two IWAFUJI GS-90LJV grapples (GS90), an IHI F801 forwarder (F801) and a Morooka MST800VDL forwarder (MST800) were studied at a thinning (site 1). A GS90, a KETO 150 Eco processor (KETO150) and a Morooka MST1500VDL forwarder (MST1500) were also studied in a clear-cutting (site 2). The difference between the GS65’s and the GS90’s unloading time at site 1 was insignificant. The GS65’s loading time was significantly faster than the GS90’s loading time at site 1, but the conditions were different. It is, therefore, likely that the GS65 is preferable to use as it is less expensive. The loaded assortment decided whether the GS90 or the KETO150 was more productive at site 2. The GS90 is preferable to use as it is less expensive. The F801 was faster than the MST800 and MST1500 and is, therefore, more productive except on short forwarding distances as it is slightly more time-consuming to load. Larger Japanese forwarders and grapple loaders like the GS65, GS90, F801, MST800 and MST1500 seemed to be more productive than smaller forwarders and grapple loaders.

    DOI: 10.1080/13416979.2018.1469208

  • Comparison of productivity and cost depending on slope when forwarding short length logs with small Japanese forwarders Reviewed

    Simon Berg, Mika Yoshida, Rin Sakurai, Hideo Sakai

    International Journal of Forest Engineering   28 ( 3 )   176 - 185   2017.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    Demand for forest biomass is growing in Japan, which makes cost-effective harvesting operations important. Information about the cost and productivity of machines helps in selecting the most cost-effective machines. However, there are some limitations in the available information about forwarders with > 3 t load capacity in Japanese conditions. An IHI F801 (F801) and an IWAFUJI U-5CG (U5) forwarder were investigated in a thinning with 0–73% slope. The F801 was found to have significantly higher speed than the U5, but no significant difference was found for loading and unloading time. The speed decreased slightly with increased slope, this decrease was more evident for the U5 than for the F801. Loading and unloading time (s/log) decreased with increasing number of logs per crane cycle. Time consumption per m3 was 25–32% higher for the U5 than for the F801. However, the cost per hour was about 31–32% higher for the F801 than for the U5, resulting in a cost per m3 that was 1.9–5.8% lower for the U5. This situation indicates that the U5 is more cost-effective than the F801, in Japanese conditions. It also seems that larger self-loading forwarders like the F801 and U5 are more cost-effective than smaller forwarders and forwarders loaded with loaders. However, the F801 could become more cost-effective than the U5 if changes in salary cost, scheduled hours, maintenance rate, and/or utilization rate occur. These facts are particularly important to consider if the F801 would be used overseas.

    DOI: 10.1080/14942119.2017.1358550

  • The Optimum Slash Pile Size for Grinding Operations: Grapple Excavator and Horizontal Grinder Operations Model Based on a Sierra Nevada, California Survey Reviewed

    Takuyuki YOSHIOKA, Rin SAKURAI, Shohei KAMEYAMA, Koki INOUE, and Bruce R HARTSOUGH

    Forests   8   442 - 452   2017.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    The processing of woody biomass waste piles for use as fuel instead of burning them was investigated. At each landing of slash pile location, a 132 kW grapple excavator was used to transfer the waste piles into a 522 kW horizontal grinder. Economies of scale could be expected when grinding a larger pile, although the efficiency of the loading operation might be diminished. Here, three piles were ground and the operations were time-studied: Small (20 m long × 15 m wide × 4 m high), Medium (30 × 24 × 4 m), and Large (35 × 30 × 4 m) piles. Grinding the Medium pile was found to be the most productive at 30.65 bone dry tons per productive machine hour without delay (BDT/PMH0), thereby suggesting that there might be an optimum size of slash pile for a grinding operation. Modeling of the excavator and grinder operations was also examined, and the constructed simulation model was observed to well-replicate the actual operations. Based on the modeling, the productivity of grinding at a landing area of 710 m2 of slash pile location was estimated to be 31.24 BDT/PMH0, which was the most productive rate.

    DOI: 10.3390/f8110442

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Books 【 display / non-display

  • Forest civil engineering

    ( Role: Joint author ,  Chapter 3)

    Asakura Publishing Co., Ltd.  2021.4 

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    Language:Japanese Book type:Textbook, survey, introduction

    CiNii Books

  • The complex system of agriculture and forestry in TAKACHIHO-GO and SHIIBA-YAMA

    FUJIKAKE Ichiro, OOCHI Shunsuke, NISHI Kazumori, ASHIDA Yuusuke, INOUE Kako, KONDO Tomohiro, SAKURAI Rin, TAKESHITA Shin'ichi and NISHIWAKI Aya( Role: Joint author)


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    Total pages:88   Responsible for pages:46-49   Language:Japanese

  • 高性能林業機械による間伐作業方法

    今冨裕樹・井上後期・小野耕平・鹿島 潤・小林洋司・櫻井 倫・鈴木秀典・辻井辰雄・仁多見俊夫・毛綱昌弘・山口浩和・吉田智佳史( Role: Joint author ,  p. 60-63, 68-73, 80-81)

    林業機械化協会  2002.4 

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    Language:Japanese Book type:General book, introductory book for general audience

MISC 【 display / non-display

  • Report on the sixth seminar of “Availability estimation and harvesting system of unused woody materials”

    Rin SAKURAI and Kazuhiro ARUGA

    The Journal of Japan Forest Engineering Society   38 ( 3 )   158 - 161   2023.9

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • The optimization of forest road network considering the movement of harvesting site to upcountry area. Invited


    Shinrin Kagaku   81   46 - 49   2017.11

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (other)   Publisher:The Japanese Forest Society  

    DOI: 10.11519/jjsk.81.0_46

Presentations 【 display / non-display

  • A case study of clearcut cable yarding with grapple carriage

    SAKURAI Rin and OHCHI Shunsuke

    The 30th conference of Japan Forest Engineering Society  2023.11.11 

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    Event date: 2023.11.11

    Language:Japanese   Presentation type:Oral presentation (general)  

  • Woody biomass power generation in Miyazaki pref. Invited

    SAKURAI, Rin

    1st woody biomass reserch meeting in 2023  2023.6.23 

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    Event date: 2023.6.23

    Language:Japanese   Presentation type:Oral presentation (general)  

  • The effect of area for forest road planning

    KANEMARU Ayaka and SAKURAI Rin

    The 29th Conference of Japan Forest Engineering Society  (Tsukuba City, Ibaraki Prefecture)  2022.10.1  The Japan Forest Engineering Society

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    Event date: 2022.10.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tsukuba City, Ibaraki Prefecture   Country:Japan  

  • The relationship between complexity of terrain and forest road network in Northwest area of Miyazaki Prefecture.


    The 28th Conference of Japan Forest Engineering Society  (Matsuyama city, Ehime Prefecutre)  2021.11.27  The Japan Forest Engineering Society

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    Event date: 2021.11.27

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Matsuyama city, Ehime Prefecutre   Country:Japan  

  • 高精度DEMによる林道の表面浸食予測

    櫻井 倫,假屋雅敬

    第76回 九州森林学会大会研究発表会  (オンライン)  九州森林学会

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    Event date: 2020.10.26 - 2020.10.31

    Language:Japanese   Presentation type:Oral presentation (general)  



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Available Technology 【 display / non-display