| Non-point source pollution of Wujiang River watershed in Guizhou Province, SW China |
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| 作者姓名： | Congguo TANG Congqiang LIU |
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| 作者单位： | [1]State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China [2]Graduate School, Chinese Academy of Sciences, Beijing 100049, China |
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| 摘 要： |
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| 关 键 词： | 非点源污染 河流 水体污染 GIS 栅格模型 |
Non-point source pollution of Wujiang River watershed in Guizhou Province, SW China |
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| Congguo TANG Congqiang LIU.Non-point source pollution of Wujiang River watershed in Guizhou Province, SW China[J].Chinese Journal of Geochemistry,2006,25(B08):141-142. |
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| Abstract: | The amount of pollution from non-point sources flowing in the streams of the Wujiang River watershed in Guizhou Province, SW China, is estimated by a GIS-based method using rainfall, surface runoff and land use data. A grid of cells, 100 m in size, is laid over the landscape. For each cell, mean annual surface runoff is estimated from rainfall and percent land use, and expected pollutant concentration is estimated from land use. The product of surface runoff and concentration gives expected pollutant loading from that cell. These loadings are accumulated going downstream to give expected annual pollutant loadings in streams and rivers. By dividing these accumulated loadings by the similarly accumulated mean annual surface runoff, the expected pollutant concentration from non-point sources is determined for each location in a stream or river. Observed pollutant concentrations in the watershed are averaged at each sample point and compared to the expected concentrations at the same locations determined from the grid cell model. In general, annual non-point source nutrient loadings in the Wujiang River watershed are seen to be predominantly from the agricultural and meadow areas. |
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| Keywords: | non-point source pollution watershed grid model loading GIS |
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