Research On Simulation And Visualization Of Urban Greenland Sponge System

With the development of urbanization,the problem of urban stormwater and water shortage become more and more serious.Greenland sponge system can combine traditional drainage system with green irrigation system,prevent flood disaster and supply groundwater safely.How to construct the green sponge system according to different greenbelt types and how to choose accurate calculation method to reflect the characteristics of urban stormwater have become the subjects that need to be studied intensively.According to the relationship between urban greenland and the underlying surface,three main types of urban greenland as road square green space,building surrounding green space and city park green space are studied.Based on the characteristics of different types of greenland,traditional drainage method is deeply analysed.And on the basis of meeting the landscape function of greenland,the construction of the sponge system is carried out.The rapid development of simulation and visualization technology provides a new technical support for the construction of more scientific,intuitive and systematic urban green space sponge system.This paper reviewed the study and progress of simulation and visualization of the green sponge system in foreign and domestic in brief,and studied the construction and simulation and visualization of sponge system.After deep analysis and comparison of domestic and foreign stormwater model,SWMM is chosen as the simulation software of this study,and the characteristics of this model and the simulation mechanism are deeply analyzed.In the paper,the advantages and disadvantages of the application in the simulation of green sponge system and key parameters needed to be suitable calibrated are discussed in some detail.In the paper,the research area is generalized bases on practical cases according to the characteristics of runoff and drainage under different cases,and the hydrological process of green sponge system is simulated by using the hydrologic model,which can be used to guide and verify the design scheme of the green sponge system.Hydrological characteristics of three types of green land are analyzed and simulated,and the results show that the construction of green sponge system can not only ease the contradiction between supply and demand of city water resource,but also decrease the city runoff,reduce peak flow and stormwater disaster greatly and realize the resource of rainwater utilization,which has created great economic and social benefits.Among them,the road green square sponge system mainly solves the problem of road surface rainfall runoff and the greenland around the building mainly solves the stormwater runoff in the roads and squares areas.However the controlling runoff abilities of these two types greenland would be in a sharp decline with the rainfall intensity increase.City park greenland can solve impervious surface runoff inside of the small park and is capable of receiving exogenous rain,whose runoff controlling ability would be slowly weakened with the increase of rainfall intensity,which cause its great potential in reducing regional flood areas.In the last part,simulated results are presented in visualization methods and the visualization of the monitoring data in the process of the construction of the green sponge system is discussed.Furthermore,the development of the integrated platform of green sponge system is discussed.Combining quantitative and qualitative methods is an important method to realize scientific design of sponge city.Through the process of simulation and visualization,it is helpful to avoid mistakes in judgment,provide support for the relevant decision-making,and also can enhance the expressiveness of the design works.