应用于地下水质评价的模糊综合评判法及其优化

Optimization and application of fuzzy comprehensive evaluation method in groundwater quality evaluation

模糊综合评判法步骤较多,计算复杂,可选方法、参数较多,需要根据具体的情况进行优化。文章根据《地下水质量标准》(GB/T 14848-2017)对隶属度函数进行优化。优化后的隶属度函数增加了第5级标准值,并改变了分段函数分级阈值,解决了原有隶属度函数在4、5类水质缺少过度,且物理意义不明确,函数递增递减范围与隶属度的定义不匹配的问题。将改进后的方法应用于华北地区某地28个检测点的水质评价中。并与改进前的综合模糊评价法和其他地下水质评价方法结果相比较,结果表明,改进后的综合模糊评判法能够更加客观的反映地下水综合质量状况。

Fuzzy comprehensive evaluation method has relatively more steps,complex calculation,optional methods and more parameters,it needs to be optimized according to the specific situation.In this paper,the weighting matrix is established by using the over standard method,and the multiplication and summation operator is selected to calculate.The membership function is optimized according to the groundwater quality standard(GB/T 14848-2017).Membership function is optimized by fifth grades standard value,and change the piecewise function grading threshold,the membership function of the lack of excessive water quality in 4,5,and the physical meaning is not clear,define the scope and function of increment and decrease of membership does not match the problem.The improved method was applied to the water quality assessment of 28 inspection sites in north china District.Compared with the improved fuzzy comprehensive evaluation method and other groundwater quality assessment methods,the results show that the improved fuzzy comprehensive evaluation can reflect the comprehensive quality of groundwater objectively.