湖泊富营养化评价的S型曲线通用表示式

在适当设定富营养化指标的“本底”值情况下 ,当指标值用对应于“本底”值的相对值表示时 ,可采用 S型曲线描述湖泊富营养化发展程度 ,从而公式中的参数可视为与指标特性无关 ,采用遗传算法对公式中的参数优化 ,得到对多项指标通用的富营养化程度的指数计算公式 ,并用广义对比因子赋权新方法计算富营养化综合指数。该评价方法物理意义明确 ,计算简单 ,使用方便 ,具有可比性和通用性

An universal formula of evaluation of lake eutrophication based on S-type curve

Based on the hypothesis of "background valucs" for eutrophication indexes, an universal formula of Stype curve, in which parameters are independ of the characters of indexes, was presented for the eutrophic state of lake, as the relative values of indexes were used instead of their monitoring values Optimum for parameters in formula was carried out using genetic algorithm to derive an universal formula of evaluation of lake eutrophication suited to multiindex The comprehensive index of lake eutrophication can be calculated in the aid of the general contrast weightting for the partial indexes The results show the clearness of physical meaning, simplicity, generality, comparison and practicality of this method