【摘要】 为了模拟复杂河网中分洪后水流在较大平面范围内的流动情况,在考虑河床、进出口和动边界等复杂边界条件下,建立了二维洪水演进数学模型,并采用交替方向隐式(ADI)法进行离散和求解.结合流域实时洪水调度仿真系统的总体框架和调用,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、历时等演进过程的二维洪水演进数值仿真系统.该系统对永定河分洪区进行了二维洪水实时演进模拟,并结合大清河实测资料进行了模型合理性分析,结果表明,该系统能够适应复杂的边界条件,可为复杂河网实时洪水预报计算和实时洪水调度提供支持.更多还原

【Abstract】 Based on the complex conditions on riverbed, inlet, outlet and mobile-boundary,a 2D flood routing model to simulate flow behaviors of flood in a large area coverage in the complex river network was proposed.The model was calculated by using the alternate direction implicit (ADI) method. A corresponding simulation system of the 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 Yongding River and its detention basins, and reasonable agreement was found between the measured data and the calculated data of Daqing River. These results demonstrated that the system can be applied to complication topography conditions and flood forecast in time in the complex river network. It will offer necessary support to real time flood regulation.更多还原