佛山市高明区洪水风险水动力模型构建及预警

Flood risk hydrodynamic model building and early warning in Gaoming District,Foshan City

佛山市高明区河流众多,暴雨、洪灾频发。采用一维和二维动态耦合水动力学数值方法构建溃堤洪水模型,分析高明区西江不同河段、不同标准洪水发生时,堤防溃口后流量、水位变化过程。在50,100,200年一遇洪水下,溃口流量最大值为2635,3137,3850m^(3)/s,随着保护区淹没水位增加,溃口流量逐渐降低。在溃决发生70~80h后,保护区内淹没水位与外江水位齐平,当区内淹没水位超过外江水位时,洪水由保护区内通过溃口流向河道,根据研究成果制定监测预警方案。

There are many rivers in Gaoming District,Foshan City,with frequent rainstorms and floods.Using one-and two-dimensional dynamic coupling hydrodynamic numerical method to construct the levee burst flood model.The paper analyzes the occurrence of different flood standards in different reaches of Xijiang River in Gaoming district,and the flow rate and water level change process after the levee burst.In the case of a 50,100,200-year flood,the maximum value of the burst discharge is 2635,3137,3850m^(3)/s.As the flood level of the reserve increases,the flow rate of the breach gradually decreased,and 70~80 hours after the outburst,the submerged water level in the protected area is flush with the water level of the river outside!When the submerged water level in the area exceeds the water level of the outer river!The flood flows from the protected area to the river channel through the ulceration.A monitoring and early warning scheme is formulated according to the research results.