六安市淠河水质时空变异研究

应用改进的灰色关联分析法对2001~2007年六安市淠河水质进行全面评价与分析,不仅采用"中心化"方法进行数列的无量纲化处理,还运用点到区间距离法计算关联系数,克服了传统灰色关联分析法的不足,使评价结果更为合理和可行。结果表明,2001年水质级别为Ⅲ类,轻度污染;2002年和2004年的水质较清洁,水质级别为Ⅱ类,其中2002年比2004年的水质好;2003年、2005年和2006年的水质清洁,水质级别均为Ⅰ类,其中2003年比2005年、2006年的水质好;2007年水质级别为Ⅲ类,轻度污染。2001~2007年水质均能达规划目标,2001~2006年水质逐渐变好,但2007年水质有反弹趋势。2007年度,窑岗嘴大桥和大店岗断面的水质均为Ⅰ类,光华厂渡口和新安渡口断面的水质级别均为Ⅱ类,各断面水质较清洁。同时在2007年度,枯水期、丰水期、平水期淠河水质依次属于Ⅰ、Ⅱ、Ⅲ级,总体水质较清洁,但平水期水质受轻度污染。

Research on the Temporal and Spatial Variation of Water Quality of Pi River in Luan City

By using the improved grey correlation analysis method,the water quality of Pi River in Luan City during 2001-2007 were roundly evaluated and analyzed.Centralization method was used to make the non-dimensional treatment of series.The point-to-interval distance method was used to calculate the correlation coefficient.It overcame the deficiencies of the traditional grey correlation analysis method to make the evaluation results more reasonable and feasible.The results showed that the water quality of Pi River in 2001 wasⅢ-grade,belonging to slight pollution.The water quality in 2002 and 2004 was cleaner,belonging to Ⅱ-grade.The water quality in 2002 was better than that in 2004.The water quality in 2003,2005 and 2006 was clean,belonging to Ⅰ-grade.And the water quality in 2003 was better than that in 2005 and 2006.The water quality in 2007 was Ⅲ-grade,belonging to slight pollution.The water quality of Pi River during 2001-2007 could reach its planning targets.The water quality was gradually improved from 2001 to 2006,but it had a rebound trend in 2007.In 2007,the water quality in the sections of Yaogangzui Bridge and Dadiangang were Ⅰ-grade,that in the sections of Guanghua Factory Ferry and Xinan Ferry were Ⅱ-grade.The water quality in each section was cleaner.In 2007,the water quality of Pi River in dry season,flood season and usual discharge season were Ⅰ-grade,Ⅱ-grade and Ⅲ-grade respectively.The overall water quality was cleaner.But the water of Pi River in usual discharge season was slightly polluted.