再生水补水人工湖水域聚类划分及水质指标时空分布特征

Water fields cluster division and water quality indexes spatial and temporal distribution characteristics of an artificial lake complmented by reclaimed water

以天津临港生态湿地公园人工湖水质和水文的调查数据为依据,运用相关性分析和聚类分析将研究水体划分为3类水域。研究了不同聚类水域水温、DO、p H、氮磷营养元素以及Chla的时空分布特征。结果显示,DO、硝态氮、TN、TP与流速呈显著正相关,水温、SS与流速呈显著负相关。Chla与水深呈显著正相关,TN、硝态氮与水深呈显著负相关。断面宽度与所有理化指标均没有显著相关性。3种水域在监测期间N/P比(TN/TP)显示湖泊正在从氮营养元素限制型(N/P<7)向适宜藻类生长的营养类型过渡。富营养化评价显示,再生水为补水的临港人工湖在监测期间水质已处于中度富营养,主要贡献因子为COD和TP。

Based on the water quality and hydrological features data of an artificial lake in Tianjin Harbor Ecological Wetland Park,the targeted lake was clustered into three water fields by using various multivariate statistical techniques including correlation analysis and cluster analysis. The spatial and temporal distribution of water temperature,DO,p H,nitrogen,phosphorus and Chla in the clustered water were studied. Correlation analysis showed that DO,nitrate nitrogen,TN,TP and flow velocity were positively correlated,while water temperature,SS and flow velocity were negatively correlated,respectively. Chla was positively related with water depth,whereas TN,nitrate nitrogen were negatively related with water depth. However,there was no significant correlation between physicochemical indexes and section width. During the survey,the rate of total nitrogen to total phosphorus（ TN/TP） was transforming from nitrogen limitation state（ N/P 7） to eutrophication state. In addition,a eutrophication risk assessment method showed that the targeted lake which was selected reclaimed water as a supplement was already in middle eutrophication,the main factors which influenced water quality were COD and TP.