| With the rapid development of urbanization and the frequent occurrence of short-duration rainstorms,urban waterlogging disasters have become an important factor affecting my country’s economic development and social stability;high-efficiency and high-precision urban stormwater models are an important technical means to accurately and effectively solve urban waterlogging disasters.In recent years,urban stormwater models have been the focus of research by scholars at home and abroad.Urban stormwater models based on different algorithms emerge in an endless stream.However,most models have trade-offs between simulation accuracy and computational efficiency,failing to achieve efficient and highprecision urban stormwater process simulation.The GAST 2D Hydrology and Hydrodynamics Module and the S WMM Pipe Network Convergence Module use the dynamic wave method to solve the 1D and 2D Saint-Venant equations respectively,and the GAST 2D Hydrology and Hydrodynamics module introduces GPU acceleration technology to solve the problem of low computational efficiency of the 2D model.Therefore,in this paper,the two are coupled to establish a coupled numerical model of urban surface runoff and pipe network drainage process based on the dynamic wave method,which verifies the accuracy and reliability of the coupled model,and the optimization study of the urban underground pipe network dredging scheme is carried out by using the coupling model.The main results and conclusions are as follows:(1)The coupling principle,coupling form and coupling realization method of GAST twodimensional hydrology and hydrodynamics module and SWMM pipe network confluence module are studied.After establishing the spatial topological relationship between the nodes of the pipe network and the surface grid,the weir flow formula and the orifice flow formula are used to calculate the water flow interactively,and the water flow interactive calculation is carried out at each time step.Based on the GAST model on the Visual Studio 2013 platform,the model coupling is completed by calling the SWMM model dynamic link library(dll file).(2)An ideal example is used to verify the accuracy and reliability of the coupled model,and then two actual urban rainwater process examples are simulated for model application,and the surface waterlogging and pipeline network drainage process are analyzed.Compared with the simulation results of other scholars,the average relative errors of pipe flow and node water depth are 2.19%and 1.72%.Simulation and application of an actual example in the northwest of Xingqing District,Yinchuan City,under the same measured rainfall conditions,the relative errors of the measured and simulated water depth and water area are 2.94%and 3.13%,and the discharge flow process is consistent with the actual physical process.The simulation and application of the actual example of the drainage zone of Nancheng Road in Guyuan City,Under the conditions of two measured rainfalls,the measured and simulated Nash efficiency coefficients of the discharge flow process of the pipe network are 0.85 and 0.52,both of which meet the standard.Water location is the same.It shows that the coupling numerical model of urban surface runoff and pipe network drainage process based on the dynamic wave method established in this paper has high accuracy and reliability.(3)Using the established coupling model,the optimization study of the urban underground pipe network dredging scheme is carried out.Taking Tianfuheyuan Community in Fengxi New Town,Shaanxi Province as an example,a set of dredging scheme to quickly restore the drainage capacity of the pipe network is proposed.The simulation test results show that the scheme cleans a small number of key dredging pipes,and the drainage capacity of the pipe network has been basically restored;while ensuring the rapid recovery of the drainage capacity of the pipe network,the workload and expenditure of the municipal pipe network dredging have been greatly reduced. |
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