季节性Kendall检验分析湘江长沙段水质变化趋势

季节性Kendall检验是一种广泛应用于河流水质变化趋势分析的非参数检验。以湘江长沙段三汊矶断面2001—2011年水质监测结果为样本,运用季节性Kendall检验分析湘江长沙段水质变化趋势及影响因素,结果表明:氨氮浓度呈显著上升趋势,总磷浓度呈高度显著上升趋势,总镉、总砷浓度呈高度显著下降趋势,湘江长沙段水质主要受城市生活、工业和农业面源污染物排放的影响,河水流量对水质的影响相对较小。

The Seasonal Kendall Inspection in Water Quality Variation Trend Analysis at Changsha Section of Xiang River

Seasonal Kendall inspection is a non-parametric inspection which is widely used for analyzing river water quality Variation trend. This article takes the water quality monitoring result of Sanchaji cross section at Changsha section of Xiang River in 2001 to 2011 as example, using seasonal Kendall inspection to analyze the trend and reason of water quality change at Changsha section of Xiang River, the result shows that: the ammonia nitrogen concentration has an obvious increase trend, total phosphorus concentration has a very marked increase trend and the concentration of total cadmium and total arsenic have very marked drop trend, the water quality at Changsha section of Xiang River is mainly affected by pullutant discharge of urban life, industry and agricultural non-point source,while river flow has relatively low impact on water quality.