Debris flow susceptibility analysis based on the combined impacts of antecedent earthquakes and droughts： a case study for cascade hydropower stations in the upper Yangtze River, China

作     者：HU Gui-sheng CHEN Ning-sheng TANOLI Javed Iqbal LIU Mei LIU Rong-Kun CHEN Kun-Ting 

作者机构：Key Lab of Mountain Hazards and Surface Processes Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China Department of Earth Sciences COMSATS Institute of Information Technology Abbottabad 22060 Pakistan School of Environment and Natural Resources The Ohio State University Columbus OH 43210 USA 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2017年第14卷第9期

页      面：1712-1727页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 0837[工学-安全科学与工程] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 41661134012 and 41501012) the Taiwan Youth Visiting Scholar Fellowship of Chinese Academy of Sciences (Grant No. 2015TW2ZB0001) 

主　　题：Hydropower stations Debris flow susceptibility Earthquake Drought Geological Information System(GIS) Upper Yangtze River 

摘      要：The upper Yangtze River region is one of the most frequent debris flow areas in China. The study area contains a cascade of six large hydropower stations located along the river with total capacity of more than 70 million kilowatts. The purpose of the study was to determine potential and dynamic differences in debris flow susceptibility and intensity with regard to seasonal monsoon events. We analyzed this region s debris flow history by examining the effective peak acceleration of antecedent earthquakes,the impacts of antecedent droughts, the combined effects of earthquakes and droughts, with regard to topography, precipitation, and loose solid material conditions. Based on these factors, we developed a debris flow susceptibility map. Results indicate that the entire debris flow susceptibility area is 167,500 km^2, of which 26,800 km^2 falls within the high susceptibility area, with 60,900 km^2 in medium and 79,800 km^2 are in low susceptibility areas. Three of the six large hydropower stations are located within the areas with high risk of debris flows. The synthetic zonation map of debris flow susceptibility for the study area corresponds with both the investigation data and actual distribution of debris flows. The results of debris flow susceptibility provide base-line data for mitigating, assessing, controlling and monitoring of debris flows hazards.