洱海流域北部入湖河流污染特征分析

Analysis of Water Pollution Characteristics of Inflowing Rivers into North of Erhai Lake Basin

罗时江在洱海北部三条重要入湖河流中受污染程度最高,是北部入湖河流控制与治理的重点。该文采用综合水质标识指数评价法来研究罗时江流域内不同时期的污染特征变化。结果表明全年罗时江水体中总氮和总磷的标识指数都维持在较高水平,整个流域受来自农业面源的营养盐污染严重。在不同季节,罗时江受各项污染指标的污染程度是不同的。夏季罗时江水体中有机污染水平最高,综合评定罗时江重点的污染时段为春季和夏季。

As the most seriously contaminated fiver among three rivers in the northern Erhai Lake watershed, Luoshi River is key point of pollution governance. Comprehensive water quality identification index is used to study the changes of pollution characteris- tics in the Luoshi River watershed in different periods. The results show that the identification index of total nitrogen ON） and total phosphorus （TP） always remains at a high level during the whole year, and the entire fiver basin is seriously polluted by nutrient from agricultural non-point source pollution. In different seasons, the contaminated situation of Luoshi River is different. In summer, the organic pollution （COD） is particularly serious. In spring and summer it is more seriously polluted according to comprehensive water quality identification index.