基于MIKE耦合模型的西苕溪洪水演进及风险分析

Flood Routing and Risk Analysis in Xitiaoxi River Based on MIKE Coupling Model

为了评估浙江省安吉县西苕溪流域洪水风险,选取西苕溪干流长潭以下至长兴界之间河段作为研究区域。研究基于河道实测断面资料和2 m×2 m高精度DEM,构建了集MIKE 11、MIKE 21、MIKE FLOOD为一体的洪水淹没演进计算模型。利用水文学方法给定各个计算方案对应的模型边界条件,计算了不同量级洪水下的淹没水深、范围、历时等风险要素。经验证及合理性分析,该模型概化方法和参数选用合理,成果满足精度要求,从而能为研究区防洪减灾、风险管理提供技术支撑。

In order to evaluate the flood risk of Xitiaoxi Watershed in Anji County,Zhejiang Province,the main stream between Changtan and Changxing is taken as study area. A flood routing model integrating MIKE 11,MIKE 21 and MIKE FLOOD is established based on the measured river section data and high-precision DEM of 2 m×2 m. The boundary conditions corresponding to each computation scheme are given by hydrological methods respectively. Afterwards,the risk elements such as submerged depth,range and duration are calculated under the floods with different magnitudes. The verification and rationality analysis show that the generalization method and parameters of model are rational,and the accuracy of results can meet requirements. The model can provide technical support for the flood control and disaster reduction and risk management in study area.