鄱阳湖湖区三站点水质评价及其变化特征研究

应用模糊综合定量评价法对鄱阳湖星子站、都昌站、棠荫站区域的水质进行了评价,以3个指标(氨氮、高锰酸盐指数、总磷)作为评价因子,建立评价矩阵,计算出因子权重,得出特征指数,最后评价出水质级别,该方法能够得到其它方法难以达到的客观性和综合性。水质监测数据和评价结果表明:2003-2008年鄱阳湖3站点水质状况尚属良好,大部分时期在Ⅱ、Ⅲ类水平,但也有部分时段超标;在劣于Ⅱ类水的情况下,3个站点所在区域枯水期水质均比丰水期和平水期差。

Water quality assessment and its changing characteristics research for the three stations in Poyang Lake

The water quality assessment of Xingzi,Duchang and Tangyin stations in Poyang Lake has been evaluated by using the fuzzy comprehensive evaluation method.The three evaluation factors as ammonia nitrogen,permanganate and totoal phosphorus were selected for the evaluating indicators.The paper also set up the assessing matrix,calculated the weights of factors and obtained the characteristics index and finally evaluated the grades of water quality.This method can achieved objectivity and comprehensiveness that other methods can’t.Water quality monitoring data and evaluation results showed that water quality of three stations in Poyang Lake was still good from 2003 to 2008.Most of time the water qualtiy was in class Ⅱ,Ⅲ level,but there were excessive in part times.In the case of worse than class Ⅱ,the water quality of three stations was worse during the dry water period than the rich water period and average water period.