Prediction of Debris Flow Runoff Process Based on Hydrological Model： a Case Study at Shenxi Gully,Regarding a Long-Term Impact by Wenchuan Earthquake

• Published in: 东华大学学报（英文版） Vol. 34; no. 3; pp. 398 - 404
• Main Author: 王钧 潘华利 欧国强 宫清华 魏新峰
• Format: Journal Article
• Language: English
• Published: Guangzhou Institute of Geography,Guangzhou 510070,China 30.06.2017; Guangdong Open Laboratory of Geospatial Information Technology and Application,Guangzhou 510070,China%Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China%China Petroleum Pipeline Engineering Co.,Ltd.,Langfang 065000,China
• Subjects: hazard inducing environment; debris flow runoff process; Wenchuan earthquake; hydrological simulation
• ISSN: 1672-5220

Debris flow runoff process is one of key parameters for the design of emergency measures and control engineering. The Shenxi gully in Dujiangyan region,located in the meizoseismal areas of Wenchuan earthquake,was selected as the study area. Based on the research of hazard inducing environment,a soil conservation service（ SCS） hydrological model was used to simulate the process of water flow,and then the debris flow runoff process was calculated using the empirical formula combining the results from the SCS hydrological model. Taking the debris flow event occurred on July 9th,2013 as an example,the peak discharges of water flow and debris flow were calculated as 162. 12 and 689. 22 m3/s,with error of 6. 03% compared to the measured values. The debris flow confluence process lasted 1. 8h, which was similar with the actual result. The proposed methodology can be applied to predict the debris flow runoff process in quake-hit areas of the Wenchuan earthquake and is of great importance for debris flow mitigation.