江南运河苏浙边界十年水质评价

Ten-year water quality assessment of Jiangnan Canal at the Su-Zhe boundary

引入目标差值率，对密切值法进行改进，详细阐述其原理和计算步骤；将其应用于江南运河苏浙边界1997～2006年的水质评价，并参照地表水环境质量Ⅱ-Ⅴ类水标准，对污染程度进行了排序。结果表明，江南运河苏浙边界十年水质均未达到Ⅲ类水标准，其中1997—1999年、2001—2002年的水质标准维持在Ⅲ～Ⅳ类之间，2000年、2003～2006年的水质维持在Ⅳ～Ⅴ类水之间。

The osculation value method was improved by introducing a target dispersion rate. Its principle and calculation steps are described in this paper. The method was applied to water quality assessment of the Jiangnan Canal, at Su-Zhe boundary, for the years 1997 to 2006, and an order of the contamination degree was given according to the Ⅱ-Ⅴ water standard of the Surface Water Environment Quality Standard. The results show that the water quality of the Jiangnan Canal at the Su-Zhe boundary was entirely below the Ⅲ water standard from 1997 to 2006. From 1997 to 1999 and from 2001 to 2002, the water maintained a Ⅲ-Ⅳ quality standard. In 2000 and from 2003 to 2006, the water maintained a Ⅳ-Ⅴ quality standard.