基于Kendall检验法的湟水水质变化趋势分析
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摘要
根据湟水流域2008—2017年实测水质资料,运用季节性肯德尔(Kendall)检验法对选取的代表性水质站点进行水质趋势变化分析、污染物输送率趋势变化分析和流量校准污染物浓度趋势分析,结果表明:研究区域水体污染物浓度存在动态变化,COD_(Mn)和NH_3-N以上升趋势站点居多,COD_(Mn)呈上升趋势的站点主要集中在湟水流域中游,NH_3-N呈上升趋势的站点主要集中在湟水流域中下游,TP以下降趋势站点居多,主要集中在湟水流域上游和中游,Cr~(6+)在湟水流域下游基本呈现下降趋势。经分析流量与浓度的相关性得出,水体污染物的COD_(Mn)主要来源于非点源污染,TP主要来源于点源污染。
Based on the measured water quality data of Huangshui River basin from 2008 to 2017, this paper used seasonal Kendall test method to analyze the trend change of water quality, the trend change of pollutant transport rate and the trend of pollutant concentration in flow calibration at selected representative water quality stations. The results show that the trend of COD_(Mn) and NH_3-N is mainly in the middle reaches of the Huangshui River basin. The trend of NH_3-N is mainly in the middle and lower reaches of the basin. The trend of NH_3-N is mainly in the upstream and middle reaches of the basin. The trend of decline is mainly in the upstream and middle reaches of the basin. Cr~(6+) is basically in the downstream of the basin. There is a downward trend. By analyzing the correlation between flow rate and concentration, it is concluded that COD_(Mn) of water pollutants mainly comes from non-point sources, while TP mainly comes from point sources.
Based on the measured water quality data of Huangshui River basin from 2008 to 2017, this paper used seasonal Kendall test method to analyze the trend change of water quality, the trend change of pollutant transport rate and the trend of pollutant concentration in flow calibration at selected representative water quality stations. The results show that the trend of COD_(Mn) and NH_3-N is mainly in the middle reaches of the Huangshui River basin. The trend of NH_3-N is mainly in the middle and lower reaches of the basin. The trend of NH_3-N is mainly in the upstream and middle reaches of the basin. The trend of decline is mainly in the upstream and middle reaches of the basin. Cr~(6+) is basically in the downstream of the basin. There is a downward trend. By analyzing the correlation between flow rate and concentration, it is concluded that COD_(Mn) of water pollutants mainly comes from non-point sources, while TP mainly comes from point sources.
引文
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