渝河(隆德段)洪水数值模拟研究

Study of Urban Flood Numerical Simulation in Yu River(Longde County)

本文以渝河流域(隆德段)洪水为研究对象,通过建立一维二维水动力耦合模型对渝河流域的洪水水深、流速进行模拟,同时广泛收集该流域洪水资料,计算洪水在不同水位的淹没面积,根据不同时刻洪水的淹没情况绘制洪水淹没图,直观呈现洪水的发展过程,据此进行不同频率条件下的渝河流域洪水演进及流量过程的动态演示.模拟结果表明:一维、二维水动力学模型主要解决的水流问题侧重点不同,将两种模型进行耦合可以避免单一模型对空间分辨率要求较高的问题,提高了单一模型的计算精度,能够较为客观评估河道洪水风险,可为河道防汛预警决策提供技术支撑.

The study takes the flood in the Yu River Basin(Longde section)as the research object,by establishing a one-dimensional and two-dimensional hydrodynamic coupling model to simulate the flood depth and flow rate of the Yu River Basin.At the same time flood data in the basin is collected to calculate the submerged area of the flood at different water levels.According to the inundation situation of the flood at different times,the flood inundation diagram is drawn to visually show the development process of the flood.In this way,the dynamic demonstration of the flood evolution and flow process of the Yu River Basin under different frequency conditions is carried out.The final simulation results show that the one-dimensional and two-dimensional hydrodynamic models mainly focus on different water flow problems.Coupling the two models can avoid the problem of higher spatial resolution when using a single model,and improve the single model.The accuracy of the calculation can objectively assess the risk of river flood villages,and can provide technical support for river flood control early warning decision-making.