Analysis of driving factors for water quality in water supply area of South-to-North Water Transfer Project in Jiangsu Province
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Abstract:
In order to determine the key factors affecting the water quality of the water supply area of the South-to-North Water Transfer Project in Jiangsu Province,the water quality driving forces of the water supply area of the South-to-North Water Transfer Project in Jiangsu Province were studied.Based on the regional characteristics of the South-to-North Water Transfer Project in Jiangsu Province,and in view of the effectiveness of water pollution control,the level of economic and social development,the scale of industrial development,the carrying capacity of water resources,the scale of typical pollutants discharge,the investment in water pollution control and the policy of ecological environment were considered and 24 independent variable characterization indexes were established.Based on step-wise regression analysis method,the optimal regression equation of water quality driving factors showed that water consumption in domestic service industry and COD regional discharge had the most significant impact on water quality.Likewise,water use efficiency in irrigation canal system and investment in regional water pollution control among the positive driving factors had the greatest impact on water quality.Moreover,targeted water quality improvement measures were proposed to classify and quantify the pollutant discharge equivalent and its long-term management responsibility for forcing local governments to increase investment in water pollution control.In addition,to promote the agricultural water saving by raising water prices for reducing the agricultural pollutants discharge;to optimize water pollution control policies that strictly prohibited the direct discharge of sewage from domestic service industry;and to strengthen internal source governance for controlling siltation pollution diffusion were also suggested.
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