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 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

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Vol14 No.9: 1712-1727

Title】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

Author】HU Gui-sheng 1; CHEN Ning-sheng 1*; TANOLIJaved Iqbal 1, 2; LIU Mei 1; LIU Rong-Kun3; CHEN Kun-Ting 1

Addresses】1 Key Lab of Mountain Hazards and Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 2 Department of Earth Sciences, COMSATS Institute of Information Technology, Abbottabad 22060, Pakistan; 3 School of Environment and Natural Resources, The Ohio State University, Columbus, OH, 43210, USA

Corresponding author】chennsh@imde.ac.cn

Citation】Hu GS, Chen NS, Tanoli JI, et al. (2017) 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. Journal of Mountain Science 14(9). https://doi.org/10.1007/s11629-017-4375-1

DOI】https://doi.org/10.1007/s11629-017-4375-1

Abstract】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 km2, of which 26,800 km2 falls within the high susceptibility area, with 60,900 km2 in medium and 79,800 km2 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.

Keywords】Hydropower stations; Debris flow susceptibility; Earthquake; Drought; Geological Information System(GIS); Upper Yangtze River