Comprehensive Evaluation Method and Fuzzy Mathematics Method of Comparative Study

摘要

The serious waste and less utilization of water resource,the problem of low utilization rate in our country is always the bottleneck in the development of society in twenty-first Century.Rational water resources quality evaluation,the water quality classification,selection of reasonable,accurate method of determining the groundwater quality is precondition of improving water resources utilization.To make an accurate assessment of groundwater quality,the choice of evaluation methods is critical.Selecting total hardness,chloride,sulfate,nitrate,iron,potassium permanganate index six important evaluation factors,using the comprehensive evaluation method and fuzzy mathematics method evaluates water quality status of representative four wells in certain region respectively.The results show that: two kinds of methods can meet the precision requirement,comprehensive evaluation method boundary is very strict,not considering each sample ions composition,extremal function too obvious.But the method of fuzzy mathematics comprehensive considering wells' each ion composition,eliminating extreme qualitative effect,the evaluation results is more objective.From human health perspective,the single index exceed the standard is not conducive to health,drinking water quality evaluation must consider the extreme value problem.