阳澄湖入湖河道水质变化及污染物通量分析

Analysis of water quality change and pollutant flux of river channels into Yangcheng Lake

分析阳澄湖主要入湖河道的近几年的水质状况,找出水质较差的几条河流以及主要的污染物指标,计算其入湖污染物通量,并进行趋势分析;比较分析外围进入准保护区的污染物通量和准保护区直接入湖的污染物通量的大小,找出污染物来源的主要区域及各河道各项污染物通量比重。结果表明:阳澄湖主要入湖河道水质无恶化趋势,基本维持在原有水平;阳澄湖西湖的主要入湖河道中,污染物通量主要来自里塘河;近5年准保护区直接入湖的总污染物通量大于外围入准保护区的总污染物通量;准保护区内NH3-N通量的年均增长率最大,是主要污染指标。

The status of water quality of the main river channels into Yangcheng Lake in recent years was analyzed. Several rivers with inferior water quality were found out, and the main pollutant indices were determined. Tendency analysis was conducted through calculation of the pollutant flux into the lake. The areas of major pollutant sources and the proportions of pollutant fluxes of the river channels were determined by comparing the pollutant fluxes of peripheral access to the quasi-protection areas and those of the quasi-protection areas directly into the lake. The results show that the water quality of major river channels into the lake levels off and there is no tendency of deterioration. Moreover, the pollutant flux of the western part of the lake mainly comes from the Litang River, and in the past five years the total pollutant flux of the quasi-protected areas directly into the lake has been greater than that of peripheral access to the quasi-protected areas, where the average annual growth rate of NH3-N, which is the main pollution index, is the highest of all the pollutants.