Debris Flow Risk Zoning based on Numerical Simulation and GIS

M. Ding, Q. Wang, C. Wu, G. Li, and X. Ma (PRC)


Numerical simulation; Geographic Information System (GIS); debris flow; risk zoning; Shengou valley


Numerical simulation of debris flow is an important method for predicting debris flow inundation region, making debris flow risk zoning and aiding the design of debris flow control works. Shengou valley, a typical debris flow valley located in Dongchuan, Yunnan province along Xiaojiang River, is selected as a case study to develop numerical simulation with the help of ArcGIS 9.0 software. The numerical simulation based on the particle model of debris flow is developed and obtained the distribution of maximum velocity, flowdepth, momentum and kinetic energy with 50 years returning period in Shengou valley. According to the ultimate bearing capacities of different structures under impacting, the risk classification standard is determined and the Dongchuan city is divided into three risk zones. The results of numerical simulation of debris flow basically accords with the field investigation in Shengou valley. So the numerical simulation based on the particle model of debris flow can be applied in many related domains, especially for landuse and urban development planning.

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