| Since 2013,the compilation of flood risk map in key areas has been completed successively in China.Flood simulation is the basis of flood risk map.The commonly used in two-dimensional flood simulation software at home and abroad is basically based on the hydrodynamic model,which has the disadvantages of high data requirements and long calculation time,and cannot meet the demand of real-time flood control.In order to improve the problem that the traditional real-time two-dimensional flood simulation cannot carry out fast calculation,this paper takes the dynamic flood risk analysis project of Huntai Hutong as the background,and takes the flood control protection area of Huntai Hutong as the research area to carry out the relevant research of dynamic flood simulation based on CADDIES model.Firstly,the principle of the model and the process of building the model are described,and then the model evaluation indexes are selected to compare the simulation results of CADDIES and HEC-RAS model.The application characteristics of CADDIES model,the influence of parameters on the model results and the calculation efficiency of the model are analyzed.And then,the multi-scenario scheme is set to simulate,and the flood evolution process of each scenario and the road to flood are analyzed.Finally,the corresponding flood risk management system is developed based on the model to provide practical application support.The main research results of this paper are as follows:(1)Based on CADDIES model and HEC-RAS model,two-dimensional flood routing simulation is carried out by using a 50-year and a 100-year flood.The simulation results show that CADDIES model has better flood inundation prediction ability as a whole,but because CADDIES model ignores inertia term and momentum conservation,compared with the hydrodynamic model,the simulation results are slightly different in the case of breaks from high terrain.At the same time,roughness has a great influence on some scenes of CADDIES model,such as the scene of upstream breaks of Huntai Hutong,but has little influence on the two downstream breaks,because the water transfer rules of CADDIES model are not completely subject to Manning formula and critical flow equation.The selection of grid resolution has a great influence on the simulation results of CADDIES model,using highprecision grid with the help of parallel computing technology,the accuracy of the model can be ensured,and the computing efficiency can be greatly improved,which is suitable for dynamic flood simulation.(2)According to different flood combination schemes and different break combinations,a total of 24 dike break scenarios were created for flood simulation calculation.The simulation results show that the flood along the terrain generally evolves from north to south and from east to west,until the downstream Sanchakou area,which is blocked by embankments on the left bank of the Hunhe River and the right bank of the Prince River,is forming a high water depth zone downstream.As the flood magnitude continues to increase,the inundation range increases,and the disaster situation increases.The effect of the road is added by raising the terrain.The simulation results show that the road has a significant blocking effect on the flood evolution.(3)Research and development of flood risk management system based on the model.The system is built by combining geographic information platform,data resource pool and model service platform.It includes real-time and historical design flood simulation calculation,static flood risk map management and system management functions.It provides technical support for real-time flood prevention and disaster reduction decision-making. |
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