以灰色系统理论为基础，把灰色关联度分析方法和单因子污染指数法相结合，构造了一种适合于评价地下水质量的灰色模型。
Based on the grey system theory, a grey assessment model of groundwater quality is built by combining the method of grey relational grade analysis and the method of single factor contaminant index.
地下水脆弱性评价方法主要有三类：迭置指数法，过程数学模拟法和统计方法。
There are three major classes of groundwater vulnerability assessment methods: overlay and index methods, methods employing process-based simulation models and statistical methods.
据综合污染指数计算分析，洞庭湖区域浅层地下水分为重度、中度、轻度和非污染4个等级。
Based on the calculation and analysis of comprehensive index-polluted, shallow-seated groundwater in Dongtinghu district can be divided into 4 classes of serious, middle, lower and no pollution.
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