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Numerical analysis of landslide-generated debris flow on July 3, 2021 in Izu Mountain area, Shizuoka County, Japan

Journal of Mountain Science 2022年第6期19卷 1738-1747页

作者： SUN Tong SUN Dong-ya WANG Xie-kang MA Qiang GOURBESVILLE Philippe NOHARA Daisuke State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu 610065China China Institute of Water Resources and Hydropower Research Beijing 100038China Universite Cote d'Azur Nice 06903France Sustainable Society Laboratory KAJIMA Technical Research Institute Kyoto University 6110011Japan

With the increasing of extreme rainfall frequency, landslides accompanied by mudslides often lead to serious casualties and property damage. On 3rd July 2021, a debris flow occurred in Izu Mountain area, Shizuoka County, Japan, and then resulted in 26 deaths and 131 houses destroyed, where houses were mainly built along the banks of the creek. In order to analyse the landslide state and distribution, a two-dimensional debris flow dynamic model(Massflow) was selected to simulate the process of the landslide-generated debris flow. When the model results are considered together with remote sensing images, the volume distribution of the unstable landslide is also able to be determined. The results show that(1) the affected areas are mainly concentrated at the outfall of the gully and on both sides of the streets.(2) The pore pressure ratio is an important factor affecting the damage range of this debris flow.(3) The increase of the pore pressure ratio in the landslide make the movement distance of debris flow increase significantly.

关键词： Izu Mountain Landslide Debris flow Numerical simulation pore pressure ratio

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