The Impact Of Urban Land-Use Spatial Patterns On Inland River Water Quality

Urban land-use change in the way that a large number of underlying surface permeability into impervious surface hardening, has a significant impact on water environment, the impact of land use change on water environment has become the frontier and hot spots in the field of global change research. Throughout the existing research mainly adopts the land classification standard, from large scale space perspective, with the aid of RS and GIS technology to obtain the quantitative index of land-use and analysis of the correlation with water quality, in the research on selection and index of the scale of the differences with the existing urban land classification methods, makes the research results hard to guide the construction of urban planning directly. Therefore, based on urban land classification methods and standards discussed urban land use pattern on water environment influence the mechanism of action, for improving the city planning and control technical methods and means, to control and manage non-point source pollution, improve urban river water quality has great realistic significance.In this paper, taking the five inland river in Hangzhou City center as the research object, choose urban roads and green space closely related to the water quality within the range of300meters on both sides of the inland river, Establish rate of greenbelt connectivity, waterfront green space average width, traffic density of road network, traffic road area ratio and other total10quantity structure and layout structure of land use pattern index, potassium permanganate index (CODMn), total nitrogen (TN), ammonia (NH3-N), total phosphorus (TP) and heavy metal lead (Pb) five water quality index. Analyze the relationship between land-use index and water quality index by SPSS and then establish the regression analysis model, reveal the influential theory and key mechanism of urban land-use on inland rivers water quality. This article main content is as follows:(1) The two kinds of land use types, urban road and green space, have distinct influence on the water quality of inland-river. Urban road negative influence for water is mainly manifested in traffic road area proportion index have positive correlation between Pb and CODMn; The positive effect of urban green space for the water quality is mainly in greenbelt connectivity of CODMn, as well as the waterfront green space average width of NH3-N、TN and TP reduction effect.(2) Optimization of land use pattern can effectively improve and control the water quality. Improve the green land comprehensive connectivity can efficiently reduce the pollution, green space layout optimization for the improvement of water quality than simple rise in number of green space; The average width of the waterfront green space increases can effectively reduce the water content of TN, NH3-N and TP, when the width up to20meters, can make the water quality indicators meet class IV water standard; Decrease traffic roads area can effectively reduce water pollution, by increasing the life road, increase the density of road network, promote slow traffic and public transport, change the way of residents to curb water pollution of the environment of the problems of car travel.(3) It is necessary to control and manage non-point source pollution, improve urban inland river water quality through some comprehensive measures of perfecting road traffic structure, reduce the number of traffic road area, change the way of residents, improving drainage patterns, enhancing the green space connectivity, setting reasonably green belt width and so on in the urban planning organization and management.