Urban Waterlogging Area Planning Based on Computer and GIS Technology

Urban flood disaster caused by heavy rain is the main natural disaster faced by cities, which not only seriously affects the traffic of cities, but also threatens the life and property safety of urban residents. Research on urban inundated area planning can effectively deal with the loss caused by urban flood disaster. In this study, one-dimensional and two-dimensional coupled hydrodynamic simulation model of urban area was established by using computer and GIS technology, and the rainfall return period of 5-year, 10-year, 20-year and 50-year was selected for simulation study. The simulation results were planned and displayed by GIS. The main conclusions are as follows: the coupling model of one-dimensional and two-dimensional hydrodynamics can be used to model the rainfall confluence process in urban areas. The combination of computer technology and GIS technology can provide scientific basis and technical support for urban flood control and drainage and inundation area planning, and the simulation results can be shown accurately and vividly. With the increase of rainfall recurrence period, the inundation range and the number of inundation risk points in the study area increased, and the inundation range in the same risk area expanded. Together, this modeling and evaluation method can help city management committees assess the potential risk of urban waterlogging, particularly in areas with high risk of waterlogging under extreme rainfall that may occur in the future.