北部湾经济区河流水质评价研究

根据2004-2009年水质监测数据，计算北部湾经济区南流江水质指标的污染分担率，选取高锰酸盐指数、总磷、溶解氧、氨氮作为主要水质评价因子，采用单因子指数评价方法、综合污染指数评价方法、综合水质标识指数评价方法和水质指数评价方法进行南流江水质评价，分析了四种河流水质评价方法的特点及其适用性，并进行了水质污染特点及其影响因素分析，秩相关系数评价方法显示主要污染因子变化趋势不显著。

An Assessment of River Water Quality in the Beibu Gulf Economic Zone

The share ratio of water pollution of Nanliu River in Beibu Gulf Economic Zone is calculated using the water quality data between 2004 and 2009.The permanganate index,total phosphorus,solute oxygen and ammonia nitrogen are selected as the main factors of water quality evaluation,and the single factor index assessment method,comprehensive pollution index assessment method,comprehensive water quality indicator index assessment method and water quality index assessment method are used to evaluate the water quality of the Nanliu River.Then the characteristics of the assessment methods above are analyzed.The water quality index assessment method is convenient and effective,and it can compare the pollution degree of the same water quality classification,also indicate the chief pollution factor in the river.