| The process of urbanization makes the city’s population and scale expanding constantly, but the urban flood disaster is increasing, causing huge economic losses and social impact. This is because the city has changed the underlying surface conditions, and increased the frequency of occurrence of heavy rain, while the backward aging urban drainage pipe drainage system can not meet the requirements. In order to enhance the understanding of the formation mechanism of urban rainwater, and prevent potential flood risk, simulation analysis of build rainwater model is very necessary. Stormwater model involves many parameters, sensitivity analysis and calibration of model parameters need to be carried out in order to improve accuracy of the model.Taking the area around the jinan yingxiongshan mountain road as the study area, a dual SWMM drainage system model is constructed using GIS, and sensitivity analysis and calibration of model parameters is carried out. The main results are as follows:1. Discuss the research status of urban stormwater model in domestic and foreign, and introduce the various methods of model parameter sensitivity analysis and parameter calibration.2. Construct a dual drainage system model. Based on DEM of Jinan, using GIS make hydrological analysis and data extraction and using inp.Pins tools make GIS and SWMM data coupling, which improves the accuracy and efficiency of the model building.3. Sensitivity analysis of SWMM model parameters based on mutual information.Two sensitivity analysis methods of mutual information and partial correlation analysis are compared. An example is presented to demonstrate the applicability of these two methods.4. Parameter calibration using automatic and manual methods. Automatic calibration of SWMM model parameters is carried out using artificial neural network method, and then manual calibration of model parameters is carried out based on trial and error method.5. Analysis the dual drainage system model response results. Based on the last artificial rate, analysis the road and the pipeline response of SWMM model.Accurate location of the water area of the area, depth and duration, and analyze their causes. |
