适用于多指标的水环境质量评价的普适指数公式

在适当设定水质指标的“基准”值情况下,用相对于“基准”值的指标相对值替换对数形式的指数公式中的水质指标值,采用遗传算法优化不同指标的指数公式中的参数,得到对多项指标通用的水质普适指数公式;并用折衷型激励功效函数将单项指标的指数加权为综合指数。公式的正确性已被用于多处水质评价检验所证实。该公式形式简单,易于计算,使用方便;具有客观性、可比性和通用性。

A universal index formula of water quality evaluation suited to multi-parameter

Based on the hypothesis of the "base value" of the water quality parameter a universal index formula suited to the multi-parameter is presented. The monitoring values of the parameters in the water quality index formula with the logarithm function form are replaced by their relative values and the optimum for the coefficients of the different indices in the formula is carried out using the genetic algorithms. The comprehensive index of the water quality can be calculated with the aid of the compromise active function weighted for each index. The formula is verified by using this method to assess the water quality states of many spots. The results show that it possesses the simplicity for the calculation, generality, comparability and objectivity.