Research on surface water environment planning of urban forest conservation in Jiufeng of Wuhan

Conservation of Urban Forest Site in Jiufeng is constructed as an ecotourism function urban forest conservation combining mountain and vegetation resource around. According to fieldwork, the conservation is located in the outskirts of the city where non-point pollution is dominant. In order to master the source intensity and its distribution, data from Quickbird remote sensing in 2004 and field collection are adopted to establish the environment database including data layers of districts, land use, map, soil map, DEM, water and road systems, soil property and economy. Traditional quantitative analysis of non-point pollution intensity has encountered with the following difficulties： （1） Large area of vegetation landscape reconstruction will create tremendous ecological benefits, but calculation of pollution decrease brought by reconstruction is difficult to achieve. （2） In conservation reconstruction will be implemented in the residential are step by step, i.e., of moving, repairing and centralization, which is a complex project with wide time span, leading to inaccurate prediction. （3） Construction of the conservation will speed up the development of local tourism, thus if a single society index is chosen to predict the pollution intensity, the development trend of the region could not be figured out completely. Consequently acreage of different planning land use is counted and models of urban and rural areas respectively help to compute unit pollution load. In the urban area, the pollution load of the same land use is regarded as the function of population density, clean frequency and precipitation, while in the rural area, SCS model, universal soil loss equation （USLE） and pollution transfer model are applied to compute unit pollution load of TN and TP. The results of total pollution load are TN 179.706 kg/a and TP 33.814 kg/a. For impracticability of routine planning measures, the project applies measures of distribution controlling against water erosion and soil loss and concentrated-dispersive controlling to lighten non-point pollution brought by living sewage.

Research on surface water environment planning of urban forest conservation in Jiufeng of Wuhan