运河杭州段水质状况变化趋势研究

Research on Trends of Water Quality of Hangzhou Section of Grand Canal

对近6年来,运河杭州段沿程5个断面的常规水质监测数据进行整理、分析,通过计算各段面的水质综合污染指数和几项重要水质指标的比值,得出在监测的5个断面中,水质综合污染指数呈下降趋势,溶解氧呈上升趋势,氨氮等污染物的污染减轻趋势显著,说明经过近几年对运河实施截污纳管、引水入河、控制面源、整治两岸环境等一系列综合整治措施,使整体水环境负荷明显改善,单位溶解氧负担的污染物减少,水体自净能力在得到恢复和增强,总体水质趋于稳定。

This paper reviewed and analyzed the common monitoring data of five sections along Hangzhou section of the Grand Canal during past six years. Through analyzing the change of water quality comprehensive pollution index and the change of several important indexes of water quality, it is concluded that the water quality comprehensive pollution index is on a declining curve and the concentration of dissolved oxygen is on the rise. Pollutants like ammonia nitrogen reduce obviously. These results show that after comprehensive improvement during recent years, for example, stopping pollutant, introducing water, controlling area source, the organic pollution in Hangzhou Section of Grand Canal reduced obviously, because the unit dissolved oxygen loading of pollutant has reduced, water self - purification ability has regained and improved, and the water quality tends to become stable.