Study On The Planning Strategy Of Rain Flood System Based On Urban Hydrological Simulation

Nowadays,the expansion of urban scale makes the hydrological characteristics and the causes of floods change.With the development of urbanization in depth,the urban flood disaster will become more frequent.Urban hydrological effects,especially the rainfall runoff patterns and coping techniques in urban areas,have become a new hotspot.In the field of planning and design,more and more engineering projects are guided by model software.It is the trend of the future research and application to use the computer to calculate the urban rainfall and flood process by selecting the appropriate hydrological simulation software.This study is based on Infoworks ICM simulation software,the simulation software in the main plate,the parameter of the model under the corresponding plate is simulated and analyzed,research on the relationship between the corresponding parameters influence on rainfall runoff characteristics.In addition,on the basis of a Jingdezhen Drainage District situation,in different return periods are simulated to assess the operation ability and the status of urban stormwater system waterlogging risk area,according to the evaluation result made the transformation plan in detail,and verify the reliability and validity of the reconstruction scheme.The following conclusions are drawn:(1)Discussing the changing trend of rainfall and runoff,runoff parameter parameter parameter influence on runoff characteristics,at the same time,based on the parameters of the local sensitivity analysis,the degree of influence of corresponding parameters on the characteristics of rainfall runoff.The analysis results show that the total amount of runoff generated by impact from large to small in turn is Hordon fixed parameters,runoff coefficient,initial loss value,Manning coefficient,surface slope,pipeline Manning coefficient;impact on the dynamic reserves of the peak from large to small in turn is fixed,the flow coefficient and the Hordon parameter,initial loss value,Manning surface the pipeline coefficient,the Manning coefficient,the slope of the ground.(2)With a Jingdezhen Drainage District present situation,established the city rainwater system model,and the return period under the simulated operation of city rainwater system under different rainfall,the load ability of stormwater system is analyzed.In addition,under different periods of rainfall recurrence and outer river water level recurrence period,the range of water accumulation and waterlogging in target area is simulated and analyzed,and the reasons for corresponding water accumulation or waterlogging are analyzed and classified.(3)According to the results of simulation analysis,put forward three kinds of transformation of the new scheme: to expand the scale of the transformation of the traditional grey facilities construction plan,using sponge City technical measures,construction scheme of grey set and grey green extension supplemented with reconstruction scheme compatible.And the return period of each scheme were simulated in different rainfall,analyzes the load capacity and the transformation plan plan to reproduce the period of rain flood system in the rainfall on the city water and the improvement effect of waterlogging.Analysis found that the three scheme,the return period of drainage capacity has a certain degree of improvement,but the traditional improved flood embankment construction scale and can not effectively solve urban waterlogging intrusion problems,the need for the expansion of the river section specifications or river diversions and other non-traditional measures.(4)In this study,the influence of each parameter change on runoff characteristics was simulated,and the influence of multiple factors on runoff characteristics was not analyzed on the basis of single parameter change.The influence of the change of parameters on runoff characteristics is not comprehensive.In addition,when the target area is simulated,the terrain data accuracy can not exactly reflect the actual topography of the study area.At the same time,the regional study of urban waterlogging analysis,the measured data to obtain a certain degree of difficulty,the outer river flood water level and flood the fixed value,did not use dynamic data to simulate the flood peak transit.In summary,the simulation results will lead to some deviations,and the accuracy of model basic data needs to be improved.