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[1]XIE Jun,WANG Ming,LIU Kai.Material Migration Patterns of Basin After Earthquake Under Extreme Rainfall -A Case Study on Hongxi Basin of Sichuan Province[J].Research of Soil and Water Conservation,2019,26(01):1-7.

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Material Migration Patterns of Basin After Earthquake Under Extreme Rainfall -A Case Study on Hongxi Basin of Sichuan Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 01 Page number: 1-7 Column: Public date: 2019-02-28

Title:: Material Migration Patterns of Basin After Earthquake Under Extreme Rainfall -A Case Study on Hongxi Basin of Sichuan Province

Author(s):: XIE Jun^1,3, WANG Ming^1,3, LIU Kai^2,3; 1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;
2. Key Laboratory of Environment Change and Natural Disaster, ministry of Education, Beijing Normal University, Beijing 100875, China;
3. Academy of Disaster Reduction and Emergency Management, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China

Keywords:: sediment yield; extreme rainfall; CAESAR-lisflood; basin; erosion; deposition

CLC:: TV142;P333.4

DOI:: -

Abstract:: Landslides triggered by Wenchuan earthquake generated a large amount of loose material. Driven by extreme rainfall events, the loose material moving into the downstream channel led to riverbed aggrading, the river channel wider, and formed the new flood risk to the residents along the low-lying river channel. This study was based on the data of extreme rainfall and gradual increases of rainfall intensity and frequency from the scenario without extreme rainfall to generate six rainfall scenarios in 2013 in Hongxi Basin in Sichuan Province. And the sediment yield and material migration rules were simulated by using the two-dimensional hydrodynamic surface landscape evolution model-CAESAR-lisflood. The results showed that with the increase of rainfall intensity, the increase of sediment yield at the basin outlet and the total sediment in the catchment was non-linear, and distinct mutation phenomenon of cumulative sediment yield occurred near the extreme precipitation events; there are obvious differences of the severity and influence range of erosion and deposition under variable rainfall scenarios; damaged vegetation after the earthquake had a great influence on the movement and spatial distribution pattern of material, the soil erosion degree difference between the upper basin with less landslide and the downstream areas with serious landslide disaster was obvious.

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