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Submersion simulation in a typical debris flow watershed of Jianzhuangchuan catchment, Loess Plateau
- Peng, Jianbing, Huo, Aidi, Cheng, Yuxiang, Dang, Jian, Wei, Hong, Wang, Xiaofan, Li, Chongyi
- Environmental earth sciences 2017 v.76 no.13 pp. 462
- basins, disasters, floods, hydrologic models, mass movement, mathematical models, rain, surveys, villages, watersheds, China
- 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.