Study On Urban Green System Pattern Based On Sponge Effect

In China,the problem of urban stormwater problem is becoming more and more serious.It is necessary to construct the urban sponge system,which can reduce the urban flood disaster and utilize the rainwater resources.Urban green system is an essential component in the process of constructing urban sponge system.From the domestic reality,this paper mainly studies the following two aspects:one is increasing the storage efficiency of sponge system through the improvement of green space system,the other one is realizing a better management of stormwater by increasing the storage efficiency of sponge system through improving the pattern of green space system.The main research results are as follows:(1)Urban green space system realizes the sponge effect in reducing the stormwater runoff,delaying the stormwater runoff and increasing the storage of stormwater runoff.How to give full play to the sponge effect of urban green space system is of great significance to the construction of the sponge city;(2)To strengthen the city based on the effect of the sponge,The pattern of urban green space system can be divided into the types of green space type factor,green scale factor and green structure factor.According to the different sponge effect of different types of green space type,the multi-level strategy is optimized.Therefore,it can effectively control the runoff in a wider range of urban areas;(3)In the case of the fixed urban green space rate,the distribution and structure of the green space not only affect the spatial pattern of the green space,but also have a positive correlation with the sponge effect.In this paper,the optimization of urban green space system is to improve the efficiency of the urban sponge system on a larger scale;(4)According to the actual situation of Jianye District of Nanjing,The 5 most closely related landscape indices,including the Class Area,the Patch Density,the Landscape Divison Index,the Connect and the Cohesion is selected.Through qualitative and quantitative research,the different index's meaning of the pattern of stormwater storage significance is determined,then the possibility of waterlogging in the study area from landscape pattern is evaluated.So the pattern of urban green space system is optimized which is based on the sponge effect.The formation of the water exchange catchment corridor is takeing shape in city water-green system.It is also an effective strategy to solve the problem of rain and flood safety in Nanjing.The green space system in contemporary cities not only has the effect of greening,it is also an important part of the construction of the sponge city.Under the condition of a certain scale of green space,the structure type of green space can be adjusted effectively.It is one of the important components of the sponge city construction to realize the overall planning of sponge city.