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Bank collapse forecast of Jiuwanxi collapse accumulation in Three Gorges Reservoir area and its influence on surge

YU Wenpeng;HUO Zhitao;WANG Shimei;TENG Shuai;College of Civil Engineering and Architecture,China Three Gorges University;Monitoring Center of Three Gorges Geological Hazards of China Institute Geo-Environmental Monitoring;  
After the Three Gorges Reservoir impounded,the reservoir-related collapse accumulation's front would form new collapse,which will cause the surge in the reservoir. In order to scientifically forecast the influence of bank collapse on collapse accumulation stability and accumulation collapse on surge disasters,taking Jiuwanxi collapse accumulation as an example and based on the engineering geological investigation,we identify its bank collapse types and characteristics,analyze the bank collapse range of the collapse accumulation by applying bank slope structure prediction method,and calculate the collapse accumulation's movement velocity before and after bank collapse with the improved slices method,forecast the initial surge height before and after bank collapse by applying Panjiazheng method and the surge climbing height on the opposite bank. The research indicates that the impoundment of Three Gorges Reservoir will increase bank collapse risk of Jiuwanxi collapse accumulation,however,the initial surge height and climbing height on the opposite bank caused by accumulation collapse will decrease after bank collapse,and the harm of the surge disasters could be reduced.
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