FIELD INVESTIGATION AND DYNAMIC ANALYSIS FOR DEBRIS FLOW IN WEIJIA GULLY OF BEICHUAN COUNTY (CHINA) AFTER THE WENCHUAN EARTHQUAKE — IJEGE
 
 
You are here: Focus and scope Issues from 2005 to 2018 5th International Conference on Debris-Flow Hazards "Mitigation, Mechanics, Prediction and Assessment" Topic 1 - Debris-flow Occurrence and Initiation FIELD INVESTIGATION AND DYNAMIC ANALYSIS FOR DEBRIS FLOW IN WEIJIA GULLY OF BEICHUAN COUNTY (CHINA) AFTER THE WENCHUAN EARTHQUAKE
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FIELD INVESTIGATION AND DYNAMIC ANALYSIS FOR DEBRIS FLOW IN WEIJIA GULLY OF BEICHUAN COUNTY (CHINA) AFTER THE WENCHUAN EARTHQUAKE



Abstract:
A great amount of mountain hazards were triggered by the Wenchuan earthquake, such as rock falls, avalanches, landslides, debris flows and dammed lakes. Heavy rain on 24th September 2008 initiated debris flows in Weijia Gully of Beichuan County, which resulted in serious damage to infrastructures and lifelines. In this paper, the debris flow was investigated and analyzed. The results show that solid loose materials, microtopography and rainfall are the main reason for the event. The total loose mass generated by the collapse and landslides reaches about 2.69×105 m3, which provides abundance material. The conditions of the surface water infiltration, runoff and flow concentration are changed by strong surface disturbance and large-scale destructive vegetation damage, which is beneficial to the formation of the erosion and flood peak. The rainfall was 272.7 mm from 23 to 24 September, 2008 in the study area, and the maximum rain reached 41 mm one hour. Velocity, peak discharge, sediment discharge and impulsive force were calculated. The results were compared with investigation, which provide reference for the design of debris flow protection.

Authors:
Xiaojun Zhou - Institute of Mountain Hazards and Environment / Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of Sciences, Chengdu 610041, China
Peng Cui - Institute of Mountain Hazards and Environment / Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of Sciences, Chengdu 610041, China
Jianqiang Zhang - Institute of Mountain Hazards and Environment / Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of Sciences, Chengdu 610041, China
Keywords
Wenchuan earthquake, debris flow, field investigation, dynamic characteristics.
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