季节性Kendall检验法在滦河干流水质分析中的应用

应用季节性Kendall检验法分析滦河水质变化趋势，并进行污染源识别。结果表明：滦河干流CODMn和NH3-N 2个指标的浓度、污染物输送率及流量调节浓度均没有明显变化；通过流量调节后上下游各站点浓度变化趋势趋于一致，同一站点CODMn和NH3-N的变化趋势也较一致，流量调节浓度趋势分析能够更好地反映水质变化趋势。5个监测站点中只有三道河子和乌龙矶2个断面的CODMn浓度出现小幅上升；5个监测站点NH3-N输送率均未出现上升趋势，三道河子、乌龙矶和滦县3个监测站点CODMn输送率呈现上升趋势。郭家屯监测站点以上CODMn和NH3-N主要受面源污染影响；郭家屯以下的4个监测站点受点源和面源污染的双重影响，以点源为主。总体上，滦河干流水质有所好转，污染源中含氮有机物浓度在不断降低或稳定不变，有机污染物总量呈增长趋势。指出郭家屯监测站点以上要积极推进水土保持工作，减少水土流失造成的面源污染；滦河下游要加强对点源污染的治理。

Application of seasonal Kendall test method to analysis of water quality in main stream of Luanhe River

The seasonal Kendall test method was used to analyze the change trend of water quality in the Luanhe River and identify the pollution source .The results show that the concentrations , pollutant transport rates , and flow control concentrations of COD Mn and NH3-N do not display a significant change trend in the main stream of the Luanhe River .The change trends of concentrations upstream and downstream of the sites were consistent , and the same-site CODMn and NH3-N change trends were also consistent after flow control .Flow control concentration analysis can better reflect the change trend of water quality .Of the five monitoring stations , two stations , the Sandaohezi and Wulongji stations ,had a slightly rising trend in COD Mn concentration .The NH3-N transport rate showed no rising trend at any of the five monitoring stations .The CODMn transport rate showed a rising trend at the Sandaohezi , Wulongji, and Luanxian stations .CODMn and NH3-N above the Guojiatun Station were mainly affected by non-point source pollution.CODMn and NH3-N at the other four stations were affected by both point source pollution and non -point source pollution , with the point source pollution being dominant .As a whole , the water quality in the main stream of the Luanhe River has improved , the concentration of nitrogen organic matter in the pollution source is decreasing or remains unchanged , and the total amount of organic pollutant shows an increasing trend .Soil and water conservation must be enhanced to reduce the non-point source pollution caused by soil and water losses above the Guojiatun Station.The point source pollution in the lower reaches of the Luanhe River should be controlled .