基于MIKE FLOOD耦合模型的新建城区防洪排涝模拟研究

Research on the Flood Control and Drainage in Newly Built Urban Area Based on MIKE FlOOD Coupling Model

为有效应对城区暴雨洪涝灾害,基于MIKE FLOOD平台,将MIKE11、MIKE21和MIKE URBAN模型耦合,构建了城区内涝耦合模型。选取新建城区东山湖产业园进行模拟。由于产业园新区无实测水文资料,采用管道流量自检验法验证了所构建的模型的合理性,模拟结果与实际情况较吻合。结果表明,在遭遇强降水时,区内出现多个溢流点,道路出现不同程度积水,部分管道处于有压流状态,检查井也多数发生溢流,无法满足排水需求。针对园区防洪排涝存在的问题,提出内涝防治方案,以MIKE FLOOD为基础,实现低影响开发(Low Impact Development,LID)措施组合布设。措施实施后,园区内地表淹没面积减少,积水深度普遍降低,积水点出现积水的时间推迟且积水总历时减小,管道排水口流量峰值明显减小,排水流量峰值的出现延迟。研究为园区防灾减灾工作提供技术支撑,也为类似城区的建设提供参考。

To effectively deal with the rainstorm and flood disaster in urban areas,a waterlogging model of flood control and drainage is built based on MIKE FLOOD platform,coupling MIKE11,MIKE21 and Mike Urban.Dongshan Lake Industrial Park,a newly built urban area,is selected for simulation.Since there is no survey hydrological data in the park,pipeline flow self-test method is used to analyze the rationality of the simulation results.The results show that the simulation results are in good agreement with the actual situation.According to the simulation results of the model,when there is heavy rainfall,there are multiple overflow points in the study area.The roads in the area also have waterlogging by different degrees,some of pipelines are in a state of pressure flow and many inspection wells overflow,resulting in overloading and inability to meet drainage requirements.Aiming at the problems existing in the park,the waterlogging prevention and control scheme is put forward.Based on Mike Flood,simulation is carried out under the combination layout of low-impact development(LID)measures.After the implementation of the measures,the surface inundation area of the study area is reduced,the depth of ponding is generally reduced,the time of ponding at each ponding point is delayed and the total duration of ponding is reduced;the peak flow at the pipe outlet is significantly reduced,and the peak flow of drainage is delayed.This study provides technical support for disaster prevention in the park and serves as a reference for the construction of similar urban areas.