改进灰色关联分析法在淠河水环境质量评价中的应用

Application of Improved Grey Correlation Analysis on Water Environmental Quality Assessment of Pihe River

灰色关联分析法是通过计算评价因子的实测浓度与各级水质标准的关联度,以确定水环境质量的级别。应用改进的灰色关联分析法对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,克服了传统灰关联分析法的不足,使评价结果更为合理和可行。结果表明: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,各监测断面水质较清洁。2007年度,新安渡口断面在丰水期、平水期、枯水期的水质依次属于Ⅱ、Ⅱ、Ⅰ级,水质较清洁,水期对水质影响不大。

Through calculating the correlation degree of measured concentration of evaluation factors with water quality standards at all levels, the gray correlation analysis method was used to determine the grades of water environmental quality according to the size of correlation degree. By using the improved grey correlation analysis method, the water quality of Pihe River in Liuan City in 2007 was 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 evaluation results more reasonable and feasible. The results show that the water quality in the sections of Yaogangzui Bridge and Dadiangang is I -grade,that in the sections of Guanghua Factory Ferry and Xinan Ferry is Ⅰ-grade in 2007. The water in each section is clean. In 2007, the water quality in the section of Xinan Ferry in flood season,usual discharge season and dry season is Ⅱ-grade, Ⅱ -grade and Ⅰ -grade respectively. The water quality was clean and was slightly influenced by water period.