综合水质标识指数法在鄱阳湖水质评价中的应用

Application of comprehensive water quality identification index in water quality evaluation of Poyang Lake

针对单因子和综合指数污染指数法进行水质评价的缺陷,应用综合水质标识指数法,采用2011年平水期的实测水质资料,对鄱阳湖综合水质进行评价。评价结果表明,鄱阳湖区各取样区综合水质指标均达到水环境功能目标,但都存在单项指标劣于水环境功能区的对应目标;五河入湖口区综合水质级别空间差异明显,饶河和赣江入湖口水质不容乐观;鄱阳湖周边环境对各入湖水系入湖前水质影响程度具有明显空间差异特征。

In the light of the defect of single factor pollution index and comprehensive pollution index in water quality evalua- tion, the comprehensive water quality identification index is used to evaluate the water quality of Poyang Lake by using the meas- ured water quality data in common water period of 2011. The evaluation results show that the all water quality in various sampling areas of Poyang Lake reaches the goal of water environmental function, the comprehensive water quality is satisfactory, but indi- vidual water quality index for various sampling areas can not meet the requirement of water function zone ; the comprehensive wa- ter classifications at the inlets of 5 main rivers entering the lake have obvious difference, the water qualities of Raohe and Gangjiang rivers are not optimistic; the influence degree of the surrounding environment of Poyang Lake on water quality of river system entering the lake has obvious spatial difference.