Modeling of surface flow and infiltration branching characteristics due to snow melting and rainfall considering snow cover and vegetation change

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K14026
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Geotechnical engineering
• Research Institution: Hokkaido University
• Principal Investigator: ISHIKAWA Tatsuya 北海道大学, 公共政策学連携研究部, 教授 (60359479)
• Co-Investigator(Kenkyū-buntansha): 森井 俊廣 新潟大学, 自然科学系, 教授 (30231640) ; 所 哲也 苫小牧工業高等専門学校, 創造工学科, 准教授 (40610457)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 地盤工学 / 自然災害 / 土砂災害 / 土壌学 / 植物

Outline of Final Research Achievements

In Hokkaido, fluctuations in the water retention and infiltration characteristics of soil ground due to the seasonal variation of land use and weather condition are extremely large throughout the year, so there is a possibility that it may enhance the occurrence of sediment-related disasters at torrential downpours caused by climate change. This study proposed a quantification method of the infiltration rate of rainfall / snow melting water, which can be a criterion for the occurrence of sediment-related disasters, from the viewpoints of snow cover / vegetation, rainfall intensity / snow melting rate, soil property, water content of the ground and frozen state. In addition, this study developed a coupled slope stability analysis for snowy cold regions by incorporating a newly proposed mathematical model for the infiltration characteristics of surface flow in the case where snow cover and vegetation are considered as an element in numerical analysis.

Free Research Field

地盤工学