Rapid erosion mechanism of debris flow and development of numerical simulation method based on particles method

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K16375
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: Forest Research and Management Organization
• Principal Investigator: SUZUKI Takuro 国立研究開発法人森林研究・整備機構, 森林総合研究所, 主任研究員 等 (60535524)
• Research Collaborator: HOTTA norifumi
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 土石流 / 粒子法 / 不飽和浸透 / 侵食過程

Outline of Final Research Achievements

The influence of unsaturated infiltration process on debris flow was clarified by channel experiment. Debris flow repeatedly stops and remigrates under low gradient conditions. On the other hand, in the steep gradient condition, the debris flow stopped once and flowed out with the subsequent flow. The calculation method to reproduce such phenomena was developed by introducing the unsaturated infiltration model into the existing particles method model of debris flow. It is shown that the experimental results can be reproduced using the developed method.

Free Research Field

山地防災学

Academic Significance and Societal Importance of the Research Achievements

不飽和浸透過程を伴う土石流の数値計算手法はこれまでにほとんどなく，先進的なモデルである。また，土石流が侵食発達によって急激に規模が増大するメカニズムは未解明であった。この手法を用いることでこのような複雑な現象が再現可能となったことは学術的に意義は大きい。また，土石流規模の予測精度が高まり，効率的な土石流対策が可能となることが期待され，社会的意義も大きいと言える。