2010-2011水文年浙江省环太湖河道水质水量及污染物通量

Water quality,quantity and pollutant fluxes variations of the rivers surrounding Lake Taihu in Zhejiang Province during hydrological year of 2010-2011

根据2010-2011水文年浙江省环太湖河道水质水量同步监测资料,分析了进出太湖的水量、水质及污染物通量的时空变化.监测期内,浙江省入湖水量为22.890×108m3,出湖水量为31.576×108m3,环湖河道水质总体上保持稳定,主要污染物指标基本处于Ⅱ～Ⅲ类标准.污染物通量的估算结果表明,环湖河道的高锰酸盐指数、氨氮、总磷和总氮通量均以出湖为主,入湖污染物通量的减少主要源于入太湖河流倒流流量的增加.

Based on the synchronous water quality and quantity monitoring of the rivers surrounding Lake Taihu in Zhejiang Prov- ince during hydrological year of 2010 -2011, we have made a thorough analysis over the temporal and spatial variations of water quantity, quality and pollutant fluxes of the rivers connected to the Lake Taihu with the jurisdiction of Zhejiang Province. In the whole hydrological year, total inflowing water was 22. 890 × 10^8 m3 , and total outflowing water was 31. 576 × 10^8 m3 , water quality of the rivers was regular and steady, indexes of main pollutants were categorized into National Grade II -III. The estimation of pollutant fluxes has shown that the CODM,, ammonia nitrogen, total phosphorus and total nitrogen outfluxes were more than influxes. The decline of pollutants influxes is mainly due to the increases of countercurrent flow of rivers flowing into the Lake Taihu.