改进的加拿大水质指数方程在丹江口水库水质评价中的应用

为研究加拿大水质指数(CWQI)方程在我国水源地水质评价中的适用性,选取丹江口水库库区及入库支流19个站点的水质监测数据为评价对象,采用改进前后的加拿大水质指数方程和我国水质指数法对监测数据进行对比了分析。结果表明,丹江口水库库区水质状况较好,能满足饮用水水源地安全的要求;少数入库支流水质状况较差,主要污染指标集中在粪大肠菌群、总氮、氨氮、总磷、溶解氧等;改进的加拿大水质指数方程较原方法能更加全面地反映样本的水质状况,与我国水质指数法得到的评价结果更加吻合,适用性较好。

Application of Improved Canadian Water Quality Index Equation in Water Quality Assessment of Danjiangkou Reservoir

In order to study the applicability of Canadian water quality index (CWQI) equation in source water quality evaluation in China, choosing water quality monitoring data of 19 sites in Danjiangkou Reservoir and the tributaries as assessment object, original Canadian water quality index equation, improved CWQI and Chinese water quality index method are used to analyze monitoring data. The results show that the status of water quality in Danjiangkou Reservoir is good to satisfy the requirements of source water drinking safety; a few tributaries are in poor water quality, the main pollution indicators are fecal coliforms, total nitrogen, ammonia nitrogen, total phosphorus, dissolved oxygen, etc. In comparison with the original Canadian water quality index equation, improved method can reflect the water quality status more comprehensively and be consistent with the method of Chinese water quality index method, which has good applicability.