Analysis and dynamic simulation of urban rainstorm waterlogging

As global climates continuous to deteriorate, urban typhoons, rainstorms and other natural disasters increase in frequency. Urban flood control and disaster mitigation issues, which are related to the people's safety and property and the implement of the sustainable development, have become increasingly noteworthy. And with the rapid expansion of urbanization, these problems will be more obvious in the future. So it is crucial to study the problem of urban rainstorm waterlogging. In this paper, the study area is located in Shenzhen City in China, and the storm sewer model (Storm Water Management Model (SWMM)) was used to calculate relative data of the urban rainstorm. The methods of subcatchment partitions were studied. GIS technology was not only used to manage massive amounts of data, such as meteorological data, GIS data and pipeline data, but also used to obtain parameters for the model. Remote Sensing (RS) technology was applied in the land utilization classification and identifying water feature. The water depth in pipeline was calculated, the depth of the waterlogged area and the time that waterlogging lasted under different rainfall frequencies were calculated. The characteristics and the process of rainstorm water on the ground and in the pipeline were also analyzed. Lastly, the methods of integrating GIS and SWMM were studied, and a 3D dynamic simulation for the process of rainstorm waterlogging realized. The results show that the application of GIS and RS technology in the process of calculating can extremely improve the efficiency of calculation and the precision of its results. The 3D dynamic simulation realized by integrating GIS technology and SWMM offers a kind of prediction method with more direct-viewing and effective characteristics, which can be applied to establish flood-mitigation measures.