Research On The Shallow Groundwater Functional Zoning Of Kunming City Based On GIS And AHP

On the basis of thorough and comprehensive analysis of detailed collection and measured data data,the quantitative e valuation of shallow groundwater resources in Kunming is carried out.Combined with three functions of shallow groundwater,resource function,ecological function and geological environment fu nction,the evaluation index of shallow groundwater function in Kunming is selected and the expert scoring method is combi ned.The results and the analytic hierarchy model calculate the weight of each layer factor index,extract and establish the GIS spatial data layer of each element,use the spatial analysis technology,carry on the grid division and assignment,and calculate the grid space of the shallow groundwater in the Kunming area based on the grid space analysis and calcula tion of the weighted addition model.The progress and research results are as follows:(1)According to the three leading functions of groundwater resource function,ecological function and geological environ ment function,the index of regenerative,regulatory,availability and occupancy of four attributes is selected,and the e cological functions of water environment maintenance,landscape environment maintenance,land environment association and vegetation environment maintenance are composed of four attributes.Index,one attribute of shallow groundwater system decay is the function index of geological environment.Finally,the index of each index factor is selected,and the index system of evaluating the function of shallow groundwate r function evaluation in Kunming is constructed.(2)Based on the expert scoring method,the contrast matrix is constructed by the analytic hierarchy process(AHP),and the index weight of each element is obtained.The weighted arithmetic average synthetic model is adopted.According to the total objective and the total demand of the shallow groundwater function zoning in Kunming,the classific ation system of the comprehensive function evaluation and evaluation results is formed.(3)Based on the GIS spatial analysis technology,the 0.5km × 0.5km grid unit is dissected in the Kunming city.On the basis of the evaluation and grid calculation of the three functional criteria of shallow groundwater resources,eco logy and geological environment in Kunming,the intensity values of the functional factors of resources,ecology and geolo gical environment in the grid units are added.According to the space grid calculation based on the weighted addition model,the overall function of the grid units is obtained,and the overall function zoning of shallow groundwater in the Kunming region is completed,and thecharacter istics of the two level functional zone of shallow groundwater in Kunming are preliminarily analyzed.