针对华阳河湖群水质变化的问题,基于典型站点水位和水质实测资料,同时运用Spearman法分析华阳河湖群水位在空间、时间变化上对水质指标的影响趋势以及水位、水质的相关性。结果表明:空间变化上,受长江来水水质影响,华阳河湖群总体呈现西部水质较差、东部水质较好的分布特征;年际变化上,在2015—2018年间,龙感湖、黄湖、泊湖、大官湖水质存在一定程度的波动,且2018年龙感湖、黄湖、泊湖水质较差;年内变化上,各湖泊污染物浓度指标总体表现出枯水期大于丰水期的特征;相关性上,华阳河湖群水位变化与TN、TP、COD浓度均呈负相关,其平均相关系数分别约为-0.43,-0.41,-0.09,但绝对值均＜0.5。研究结果可为今后华阳河流域的水环境综合治理提供参考。

According to measured data of water level and water quality at typical sites of Huayang River and Lake Group, we analyzed the influences of spatial and temporal changes of water level on water quality indicators and the correlation between water level and water quality using the Spearman method. Results demonstrated that affected by the incoming water quality of the Yangtze River, the water quality of Huyang River and Lake Group was inferior in the west while superior in the east. In interannual scale, the water quality of Longgan Lake, Huanghu Lake, Bohu Lake and Daguan Lake fluctuated from 2015 to 2018, and particularly in 2018, the water quality of Longgan Lake, Huanghu Lake and Bohu Lake were inferior; in annual scale, the pollutant concentration index of each lake was larger in dry season than that in wet season. In addition, water level fluctuation is negatively correlated with the concentration of TN, TP and COD. The average correlation coefficient is about -0.43, -0.41, -0.09, respectively, and the absolute values are all smaller than 0.5.