Risk assessment of rainstorm waterlogging based on numerical simulation in Shenzhen Minzhi District
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Abstract:
Based on SWMM model and two-dimensional hydrodynamic model,a hydrodynamic coupling model for urban rainwater and flood was established in Shenzhen Minzhi District.The model was validated using historical data.The results showed that the model had good accuracy and reliability.The urban rainflood model was used to simulate and analyze the waterlogging situation in the Minzhi District.According to hazard factors and the affected area,risk assessment index system was established in the study area.ArcGIS technology and analytic hierarchy process method was used to evaluate the risk of waterlogging disaster in Minzhi District.The result of waterlogging risk assessment showed that the risk of waterlogging disasters in the cities was mainly affected by inundation.The high risk region were mainly located in downstream area of Minzhi River inside Minqiang Community,Minzhi Community and Xinniu Community,while the low risk area were mainly distributed in Minle Community,Mintai Community and Daling Community away from Minzhi River.
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