自动监控系统在太湖流域水质变化预警中的作用

以2011年太湖流域水质自动监控系统捕捉到的水质异常数据为基础,对太湖流域水质异常预警的特征进行分析。结果表明,太湖流域水质异常预警具有明显的时空变化特征,水质异常频次较高的断面多位于丹阳、武进、宜兴交界处,且以泥炭河、漕桥河、中干河等河流为主。流域水质异常预警主要发生在枯水期,导致水质异常的主要污染指标以氨氮、总磷为主。典型河流水质预警情况分析表明,流域水质变化具有明显的上下游响应关系。水质变化与水文气象、工厂生产周期等外界因素的关系较明显。

The Role of Automatic Monitoring System in Early Warning for Taihu Basin Water Quality Change

On basis of the uncommon data from water quality automatic monitoring system in Taihu basin, the feature of uncommon water quality early warning is analyzed. The results show that there is an obvious variation for its spatial and temporal distribution. Most sites with high frequency of uncommon water quality locate at the boundaries of Dayang, Wujin and Yixing and mainly along Nitanhe River, Coqiaohe River and Zhongganhe River. Uncommon water quality accidents often occur in low water period.Ammonia nitrogen and total phosphorous are the main pollution index. The early warnings in a typical river indicate that there is a significant relationship between the sites on upper stream and lower ones. The change of water quality is also related to the hydrographical meteorology and the work period of factories.