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[1]LIN Xiaosong,CUI Mengrui,MOU Fengyun,et al.Assessment of Hazard of Flash Flood Disaster in Wushan County Based on Multi-Scenarios[J].Research of Soil and Water Conservation,2018,25(06):370-376.

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Assessment of Hazard of Flash Flood Disaster in Wushan County Based on Multi-Scenarios

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 06 Page number: 370-376 Column: Public date: 2018-10-26

Title:: Assessment of Hazard of Flash Flood Disaster in Wushan County Based on Multi-Scenarios

Author(s):: LIN Xiaosong¹, CUI Mengrui¹, MOU Fengyun¹, YU Qing², XU Zhou¹; 1. College of Architecture and Urban Planning, Chongqing Jiaotong University, Chongqing 400074, China;
2. College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China

Keywords:: environmental hydraulics; hazard assessment; scenario simulation; flash flood disaster; Wushan County

CLC:: P426.616;P954

DOI:: -

Abstract:: Taking Wushan County of Chongqing as the research area, we constructed static and dynamic hazard assessment index for flash flood disaster. Based on the five conditions of precipitation (50 mm, 100 mm, 150 mm, 200 mm and 250 mm in 48 hours), we took the land use and soil type factors into account and simulated the cumulative amount of surface runoff in the study area. We calculated the flash flood disaster hazard index value of each evaluation unit in the research area by using the spatial superposition method, and classified the risk of flash flood disaster into four levels of high hazard, medium hazard, low hazard and basic security based on the threshold value. The results showed that mountain flash flood disasters in Wushan County were dominated by low risk and medium risk areas, but areas with the medium and high risks were relatively large, up to 39% of the total area. while the precipitation increased from 50 mm to 250 mm within 48 hours, the area with basic security was basically unchanged, the area with low risk slightly reduced, the area with medium risk reduced by 10.425 1 km², the area with high risk significantly increased by 13.727 5 km². On the township scale, there were 10 townships which contained medium and high risk areas accounting for 40% of the total area. The towns which held relatively high risk indices were mainly located in the south and west of the study area. On the administrative village scale, the results of the evaluation were in good agreement with the distribution of historical disasters, while the risk index value more than 1.7 of the total number of villages accounted for 54.11%. The results from different scales and multi-scenarios reflected the hazards distribution of mountain torrents in Wushan County, which could provide the scientific basis for the prevention and control of mountain torrential disasters in the research area and had some guiding significances.

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