Submersion simulation in a typical debris flow watershed of Jianzhuangchuan catchment,Loess Plateau |
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| Authors: | Jianbing Peng Aidi Huo Yuxiang Cheng Jian Dang Hong Wei Xiaofan Wang Chongyi Li |
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| Institution: | 1.College of Geology Engineering and Geomatics,Chang’an University,Xi’an,China;2.School of Environmental Science and Engineering,Chang’an University,Xi’an,China;3.Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region (Chang’an University),Ministry of Education,Xi’an,China |
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| Abstract: | Debris flow is one of the most serious and frequent geological disasters that occur in the Loess Plateau. The outbreak of a debris flow is sudden, ferocious, swift, and destructive. The characteristics and mechanism of debris flow were explored in this study via survey, numerical simulation, and simulation analysis in a Loess Plateau area (Huangling County, Shaanxi Province, China). Numerical models and formulas corresponding to the occurrence and movement mechanism were established based on the HEC-RAS, HEC-GeoRAS, and SWAT results. The range of debris flow deposition was determined through capturing the debris flow free surface. A hydrological model and critical rainfall threshold were determined in order to provide technical support for debris flow forecasting in the Loess Plateau. The results suggest that 10-year floods do not submerge any portion of the basin. One village area was affected by the 100-year flood (total area of 0.648 km2) while four villages areas were submerged by the 1000-year flood (total area of 1.39 km2). The method presented here may provide a reliable scientific basis for mitigating loss due to debris flow hazards. |
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