基于耦合水动力模型的广州市东濠涌流域洪涝模拟

东濠涌流域位于广州市中心城区越秀区内,调研分析流域内积水点淹没成因与利用数值模拟方法研究该城市流域洪涝过程并获得一定可靠性和精度的洪涝水情信息,可为相关部门抢险救灾决策提供理论参考和科学依据。根据城市洪涝过程的水文水力学方法原理,以SWMM作为一维模型基础,采用动态链接库文件(DLL)方法耦合二维水动力模型,通过侧向、正向和垂向的连接构建耦合水动力模型,以东濠涌流域为研究区域构建基于耦合水动力模型的东濠涌流域洪涝模型并选用两场实测降雨对模型进行模拟分析。结果表明:模型在一维排水系统的排水能力与二维地表积水的模拟均具有较好的精度和可靠性。该耦合水动力模型在东濠涌流域的应用进一步证明了耦合模型连接算法的合理性和可行性,对城市洪涝模拟分析有较好的应用价值。

Flood simulation of Donghaochong Basin in Guangzhou City based on coupled hydrodynamic model

Donghaochong Basin is located in Yuexiu District, the centre of Guangzhou City. Through investigation and analysis of the causes of inundation at water points in the river basin and the use of numerical modeling, this paper studied urban basin flood process and obtained flood information with certain reliability and accuracy, providing theoretical reference and scientific basis for decision making concerning disaster relief by related departments. According to the principles of hydrologic hydraulics about the process of urban flood, the SWMM was taken as one-dimensional (1D) model, the two-dimensional (2D) hydrodynamic model was coupled through DLL, and the coupled hydrodynamic model was constructed through the connection of horizontal and vertical direction. The flood model of Donghaochong Basin based on the coupled hydrodynamic model was constructed. Two measured rainfall events were simulated and analyzed, and it turned out that the flood model had good accuracy and reliability in the simulation of 1D drainage system and 2D surface waterlogging. The application of the coupled hydrodynamic model in Donghaochong Basin further proved the rationality and feasibility of the coupling model connection algorithm, showing great application value in urban flood simulation and analysis.