基于点到区间距离的水质灰色关联评价方法改进及其应用

Application of an Improved Grey Relation Analysis Method Based a Distance of a Point to an Area for Water Quality Evaluation

结合水质标准是区间而非点的特点,采用基于点到区间距离的灰色关联分析法对水质进行评价;并结合水质标准区间不均匀的特点,对关联系数的计算方法进行改进,避免了传统水质灰色关联评价方法中选取典型值时存在主观性的缺陷。这种方法计算简单,物理意义明确。将其应用于郑州市伊洛河区地表水水质评价中,并与其它方法进行了比较。

Given that the water quality standards is not a point but an area,an improved grey relation analysis method based a distance of a point to an area was adopted to evaluate water quality.An improved method of calculating correlation coefficient was proposed because of the uneven interval of water quality standards,avoiding the defect that subjectivity was existed in the procedure of selecting typical value representing each quality level in traditional ones.This method is simple and physically univocal.A comparison with existing varies of methods through an example in Zhengzhou shows that this method is available.