2022 Fiscal Year Final Research Report

Expansion of comprehensive evaluation for driftwoods disaster risk considering climate change effects

Research Project

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Project/Area Number	19H00812
Research Category	Grant-in-Aid for Scientific Research (A)
Allocation Type	Single-year Grants
Section	一般
Review Section	Medium-sized Section 25:Social systems engineering, safety engineering, disaster prevention engineering, and related fields
Research Institution	Kyushu University
Principal Investigator	Yano Shinichiro 九州大学, 工学研究院, 教授 (80274489)
Co-Investigator(Kenkyū-buntansha)	笠間清伸九州大学, 工学研究院, 教授 (10315111) 二瓶泰雄東京理科大学, 理工学部土木工学科, 教授 (60262268) 水野秀明九州大学, 農学研究院, 准教授 (80356104) 浅井光輝九州大学, 工学研究院, 准教授 (90411230)
Project Period (FY)	2019-04-01 – 2023-03-31
Keywords	流木 / 洪水 / リスク評価 / 斜面崩壊 / 豪雨 / 気候変動 / 3Dプリンタ
Outline of Final Research Achievements	Although remarkable flood with sediments and driftwoods occurred in three rivers of Uchikawa, Shinkawa, and the Gofukutani Rivers of the Abukuma River contributory as a result of the driftwood disaster field suvey by the East Japan typhoon in 2019. In the July 2020 heavyrain event, two rivers, that is, the Kuma River and Chikugo River, showed heavy driftwood disaster, also. Logistic model analysys, which has been developed by Shogaki et al (2016), was applied these two disaster and other twe events (Northern Kyushu Heavyrain in 2017, and West Japan Heaverain in 2018). It is shown that trend of driftwood generation depends on rainfall pattern and geological characteristics. Effects of specific weight and existence of a ramus are clarified from hidraulic experiment on driftwoods accumlation on a brige by using 3D printing driftwood model.
Free Research Field	河川工学
Academic Significance and Societal Importance of the Research Achievements	気候変動の進行に伴い増大が懸念される大規模豪雨災害において同時生起が起こりうる流木災害について，流域一貫した総合管理を可能にするための流木災害リスク評価モデルのベースモデルを構築した．これにより，河川の治水計画（河川整備方針や河川整備計画）において流木災害リスクを考慮することが可能になった．これより，L1レベル対策としてのハード整備とL2レベルのリスクに対するソフト対策を明確に区分して治水計画中に組みこめる様になることが期待され，より実効性の高い治水政策へ寄与できる．