基于因子分析定权法的丹江口水库水体营养度综合评价

General Evaluation on Water Mass Trophic Status of Danjiangkou Reservoir Based on Weighting Method with Factor Analysis Method

指标权重值的确定是多指标水质评价法实际应用中的关键问题。针对模糊评价等方法中权重值确定所具有的主观性,提出了基于因子分析定权的水质综合评价法及富营养化指数的概念,并将其应用于南水北调中线工程水源地-丹江口水库水体营养度的综合评价。结果表明,丹江口库区的污染物类型可以分为两类;丹江口库区水体营养度全年时段内均处于中营养化水平,但是,不同采样点、不同季节时的水体富营养化指数的差异还是较大的。总体来看,丹江口库区中,小太平洋水质最好,陶岔水质次之,大石桥水质最差。

Determining of indexes＇ weight values is a key problem to apply multi -index water quality assessment method. To resolve subjective shortages of determining weight values with fuzzy assessment method, etc, a general water quality assessment method namely weighting method with factor analysis and a eutrophication index concept are presented and applied to evaluate water mass trophic status of Danjiang reservoir area in Danjiangkou reservoir, which is partial water source area for Middle Line Project of Transferring Water form South to North. The results show that contamination can be classified into two types; the status in Danjiang reservoir area is middle - trophic through a year, but the statuses between different sampling sites are relatively remarkable with different seasons. Generally speaking, water quality of Xiaotaiping is best, that of Taocha is secondly best, that of Dashiqiao is worst.