浅析大沽河流域水质状况及变化趋势

大沽河流域监测数据显示:2012年,大沽河干流水质良好,功能区达标率为100%,多数断面综合污染指数呈丰水期枯水期平水期。大沽河主要支流水质总体为轻度污染,主要污染指标为五日生化需氧量、化学需氧量、氟化物,功能区达标率为68.8%,从污染较重河流(桃源河、云溪河、洙河下游)不同水期综合污染指数来看,桃源河和洙河下游呈丰水期﹥平水期﹥枯水期;云溪河由于贯穿胶州城区,受农业面源、降水因素影响较小,呈枯水期﹥丰水期﹥平水期。2006—2012年,大沽河干流水质基本保持稳定,主要支流水质呈改善趋势。

Analysis of Development Trend and Status of Water Quality of Dagu River

The monitoring data of water quality of Dagu River showed that the water quality of the mainstream of Dagu River in 2012 was generally good,and the compliance rate of functional zone was 100%,the comprehensive pollution index of most monitoring sections had the trend for wet season 〉dry season 〉normal season.The water quality of the main branches of Dagu River was at the light pollution level,and the pollutants were biochemical oxy-gen demand,chemical oxygen demand,fluoride.The compliance rate of functional zone was 68.8%,and from the comprehensive index of different water period for the rivers which were heavily polluted,Taoyuan River and the downstream of Zhu River had the pollution trend for wet season〉normal season〉dry season.Yunxi River flowed through the city area of Jiaozhou,which was lightly influenced by agricultural area-source pollution and precipita-tion,and had the trend for dry season 〉wet season〉season.From 2006 to 2012,the water quality of mainstream of Dagu River was kept steadily,and the water quality of the main branches of Dagu River has been improving.