Research On The Construction Of Sponge City In Zhengzhou Based On The Change Of Land Use Type

With the acceleration of urbanization process,which make the area of city expand around and change the land use structure.To some extent,the change of urban land use affects the city's ecological storage and it's control capacity.The concept of Sponge City advocates that urban development and construction should respect and protect the nature.At the same time,it was put forward to make sure the urban hydrological cycle characteristics are maintained before exploited,and to reduce the damage to the natural ecology in urban construction.The aim of Sponge City is to maintain the normal ecological storage capacity of the city and to improve the sustainability of the urban.This paper takes Zhengzhou as the studied area to analyze the change characteristics of land use and their effects on the urban storage capacity in Zhengzhou since 1988.It has been found that the area of urban cavernous bodies and the natural storage capacity in Zhengzhou has been continuously decreasing.The change of river system can reflect the change of land use type of Zhengzhou.In the meantime,the influence of river system on storage capacity can be quantified by several indexes.In this paper,I analyzed the change of river system and its influence in Zhengzhou.It is concluded that the change of river system in Zhengzhou which reduced the natural storage capacity of river.On this basis,the paper puts forward some methods to build the Sponge City for Zhengzhou which involved to improve the sustainability of the city and to upgrade the storage capacity of the river.Low impact development measures also be put forward to develop the different kinds of city's land resources.The main content of the article can be divided into three parts:The first part of this article states the concept,essence and construction way of sponge city,as well as the relationship between the sponge city and low impact development,the sponge city and change of land use type and.In addition,This article not only discussed the theory research and practice of sponge city at home and abroad,but also combined with the influence of urban land use type change on the city's hydrological process and storage capacity.The second part of this paper is about to analysis the characteristics and influence of land use type of Zhengzhou.Through the interpretation of remote sensing image data,I established the land use classification system which based on the impervious surface.The results showed that the impervious surface area and specific gravity of Zhengzhou have increased year by year in recent years,the vegetation cover surfaces climbed up and then declined,and the water and other types of land have been reduced.It is also found that the land use degree in Zhengzhou is in a high level,which indicates that the land use is greatly affected by human activities.The analysis of river structure is mainly reflected by river length,water area,river network density,surface water rate and water system connectivity.In recent years,the river water system in Zhengzhou is still disappearing,which is not conducive to the normal regulation of urban waterlogging.The third part of the article is the construction strategy of sponge city in Zhengzhou.The paper puts forward some methods to build the Sponge City for Zhengzhou which involved to improve the sustainability of the city and to upgrade the storage capacity of the river.Low impact development measures also be put forward to develop the different kinds of city's land resources.First of all,we should protect the existing ecological sponge bodies,repair the damaged sponge parts and construct a new one in Zhengzhou.At the same time to upgrade the urban drainage network and build an efficient drainage system.Besides,we can also improve the waste water treatment rate and the water use ratio and so on.Then,to protect the existing water systems and the river's biodiversity,increase the ratio of water surface and the water storage space of the River and improve the connectivity of urban water to construct the water network.Finally,the paper puts forward the low impact development measures from the different use of the land resources,which refer to the land of residential and commercial,road and traffic land and the green space.