岳城水库水质富营养化评价

Water Quality Eutrophication Evaluation in Yuecheng Reservoir

岳城水库作为华北地区重要饮用水源地,水库的富营养化程度直接体现水质的好坏,但随着数年连续干旱、蓄水量逐步减少的情况,岳城水库面临水质富营养化的压力也越来越大.采用模糊综合评价法和综合营养状态指数法对水库2001—2010年的富营养化程度进行分析对比,模糊综合评价法的结果是水库水质的富营养化程度在中富营养和富营养之间,综合营养状态指数法的结果为水库水质属于中营养,2种方法评判结果的总体变化趋势基本相同,均表明水库的富营养化程度在逐渐好转.水库的富营养化主要是由氮引起的,因此急需对上游和周边的氮污染源进行治理.

Yueeheng Reservoir is an important source of drinking water in North China. The eutrophication degree directly reflects the water quality of the reservoir, but with the continuous drought and gradually reducing water storage capacity, the eutrophication pres- sure is increasing in Yuecheng Reservoir. In this paper, the fuzzy comprehensive evaluation method and comprehensive nutrition state index method are used to analyze the eutrophication degree of the reservoir from 2001 to 2010. And the result of the fuzzy comprehen- sive evaluation method are that the eutrophication degree is between middle eutrophication and eutrophication; the results of the com- prehensive nutrition state index method is that the reservoir has reached mesotrophy; and the overall trend of the results of the two methods is substantially identical. Both indicate that the degree of eutrophication in the reservoir is gradually improved. According to the results of analysis, the eutrophication of reservoir is mainly eaused by nitrogen, so it is urgent to control the upstream and surround- ing nitrogen pollution sources.