杭州市余杭地表水水质调查研究

On the Surface Water Quality in Yuhang,Hangzhou

本研究在余杭区地表水中设置12个监测断面,且对其水质进行监测,并采用单因子评价法和内梅罗污染指数评价法对地表水环境进行评价.结果表明,余杭区地表水质中总磷为最主要污染因子,但2014—2016年间总磷指数上塘河保障桥从5.700降至1.055,三义村也从5.450降至2.205,水质提升明显.内梅罗污染指数评价结果表明,除北苕溪四岭水库外各断面均受到不同程度的污染,且2014年较为严重,上塘河两河流断面综合污染指数均大于4,但在2015年污染指数最高的上塘河保障桥断面已降至2.073,到2016年所有断面水质均有改善,监测点的河水环境综合污染指数(PI p值)维持在0.669—1.469之间,多为轻度污染.总体来看,3年期间各河流断面水质均明显改善.

Twelve monitoring sections were set up in the surface water of Yuhang District in this study,and the water quality was monitored.The single-factor evaluation method and the Nemerowan pollution index evaluation method were used to evaluate the surface water environment.The results showed that total phosphorus was the most important pollutant factors.From 2014 to 2016,the total phosphorus index of the Shangtang River Safeguard Bridge decreased from 5.700 to 1.055,and that of Sanyi Village decreased from 5.450 to 2.205,the water quality obviously improved.The results of the Nemerow pollution index evaluation showed that all sections,except the North Tiaoxi Siling Reservoir,were polluted to varying degrees,and were relatively serious in 2014.The comprehensive pollution index of the two rivers in Shangtang River was greater than 4,however,the pollution index of the Shangtang River Safeguard Bridge,where was the most polluted section in 2015,reduced to 2.073,and the water quality of all sections improved in 2016.The PI p values of the monitoring sites remained at 0.669—1.469,mostly mild pollution.Overall,the water quality of each river section had improved significantly during the three years.