蓄滞洪区洪水演进一、二维数值仿真及其在洼淀联合调度中的应用

Research on 1D and 2D numerical simulation of flood routing and its application of combined-regulation in detention basin

为了实现蓄滞洪区内各洼淀实时洪水调度,考虑到蓄滞洪区内复杂河网与洼淀交错的情况,建立了河道、滞洪区联合计算的一、二维衔接洪水演进数学模型,在考虑铁路、公路、堤防及桥涵等阻水建筑物等复杂边界条件下,采用有限体积法进行离散和求解。结合蓄滞洪区实时洪水调度仿真系统的总体框架,建立了模拟洪水在蓄滞洪区内任意位置的水位、流速、淹没水深、历时等演进过程的一、二维洪水演进数值仿真系统。结合大清河实测资料对东淀滞洪区洪水演进进行了模型验证,结果基本吻合,并应用该系统对大清河滞洪区五洼联合调度方案进行了实时模拟,分析了洼淀联合调度下出现的倒淀现象,对不同方案进行了比较分析,实现了实时的洪水调度分析。

Based on the overlapped conditions on complex river network and basin,a 1D and 2D flood routing model which is based on water-resistance structure of railways,roads,embankment and mobile boundary to realize timely flood regulation in basins of the detention basin was proposed.The model was calculated by using the finite volume method（FVM）.A corresponding simulation system of the 1D and 2D flood routing model was set up in consideration of the total frame of flood optimization regulation.Any position＇s water level,flow speed,water height and submerged time can be acquired from it.The system was used in Dongdian Basin,and reasonable agreement was found between the measured data and the calculated data of Daqing River.The system was also used to simulate the program of five basins combined-regulation in Daqing River Basin,and to analyze the return basin phenomenon,comparing different cases.