| In this paper,the Yinzhou District of Ningbo City is used as the research area to construct the urban rainstorm inversion simulation model based on the FloodArea model.The mathematical statistics method is used to calculate the rainfall rainfall distribution under different return periods.According to the constructed urban storm intrusion simulation model,the research area is reproduced differently.The simulation of the internal conditions under the period of rainfall was carried out,and conducted applied research on the model,the urban intrinsic analysis system of Yinzhou District of Ningbo City was designed.According to the forecast rainfall,the urban waterlogging is simulated to achieve the purpose of forecasting and warning..The major research of this paper are as follows:(1)A simulation model of urban storms based on the FloodArea model was constructed.The GIS spatial analysis technology is used to modify the DEM.The surface roughness and runoff coefficients are calculated according to the Manning coefficient empirical data and the LCM model,so that the model is more suitable for the underlying surface of the study area.The SWMM model is used to simulate the pipe network displacement participation model in the study area.Computing to improve the applicability of the model in the city.The model was validated by two typical rainfall processes and validation data.The results show that the model has good simulation results and reliability.(2)Based on the historical rainfall data of Yinzhou Station,the optimal function was used to calculate the rainfall and rainfall patterns in the rainfall return period of the study area..Comparing the sampling results of the maximum sampling and the super-threshold peak for the rainfall extreme value,the super-threshold peak sequence method is selected to obtain the rainfall extreme value sample sequence,and the 46 probability density distribution functions are used to fit the extreme value sample sequence respectively.The goodness-of-fit test method selects the optimal fitting function of different time series of extreme duration rainfall samples to calculate the rainfall under different storm frequency.According to the rainfall characteristics of the study area,the stepless average method was used to estimate the rainfall pattern under the 24-hour rainfall return period.(3)Based on the constructed urban storm simulation model,the rainfall process of the 10,30,50 and 100 years of the study area was simulated,and the simulation results were analyzed from time scale and spatial scale.The construction department and the disaster prevention department make technical support for making decisions.(4)According to the business needs of Ningbo Yinzhou District Meteorological Bureau,the urban in-situ analysis system of Yinzhou District was designed to automate and semi-automatically simulate the historical and forecast rainfall data,and the simulation results were dynamically displayed in the 3D scene,Aim to achieve the purpose of forecasting and warning,so that users can perceive the future period in advance.The process of change in the city during the time is easy to make preventive measures. |
