桃溪水库水质监测与评价

Monitoring and Evaluation on Water Quality of Taoxi Reservoir

本研究选取桃溪水库2013-2018年常规水质监测数据,利用单因子评价法、单项污染指数法、综合污染指数法和综合营养状态指数法等对桃溪水库的水质状况、变化趋势及水体的富营养化程度进行了分析与评价。结果表明,桃溪水库水质等级整体处于Ⅱ～Ⅲ类,处于中营养化水平;COD_(Mn)、BOD_5、TN、TP和chla等水质指标浓度呈现年度周期性变化,且水质有变差的趋势;水体绝大多数月份的TN/TP比值大于13,属于磷限制水体。

The routine water quality monitoring data of Taoxi Reservoir during 2013-2016 were selected, and the methods of single factor evaluation, single pollution index, comprehensive pollution indices and comprehensive trophic status indices were employed for the analyzation and evaluation of water quality status, change trend and eutrophication degree for Taoxi Reservoir. The results showed that the water quality of Taoxi Reservoir, as a whole, met the Ⅱ~Ⅲ grade of Environmental quality standards for surface water and was in the middle eutrophication level;the annual cyclical changes about water concentrations such as CODMn, BOD5, TN, TP and chla were found and the water quality has a tendency to deteriorate;the TN/TP ratios were greater than 13 in most months indicated it was phosphorus-restricted water.