前者主要是被污染地下水中阴离子替代组成含水层介质骨架的矿物晶格中阴离子，生成新的矿物相的过程。
The metasomatic process is mostly the substitution of anions in the crystal lattice of minerals making up the matrix of aquifers by anions from polluted groundwater to form new mineral facies.
前言：介绍了DR AST IC模型的七个评价因子：地下水埋深、含水层净补给量、含水层介质类型、土壤类型、地形坡度、包气带介质i的影响和含水层的导水系数。
The paper introduces seven factor of DRASTIC model: Depth of water table, Net recharge, Aquifer media, Soil media, Topography, Impact of Vadose Zone and Hydraulic Conductivity.
该模型能反映漏斗中心水位的动态特性，且不要求均衡区承压含水层为各项同性的均匀透水介质；
The model can reflect the dynamic characteristics of the water stage at the cone center, and it does not require artesian aquifers in balance regions to be of homogeneous media.
研究结果表明：对于成层介质中的渗流计算，可用等效的各向同性的均质含水层代替不同透水性介质组成的层状岩土层。
The results show that the equivalent isotropic homogeneous aquifer can substitute the layers consisted of different water-permeable media for seepage flow calculation in the layered media.
研究结果表明：对于成层介质中的渗流计算，可用等效的各向同性的均质含水层代替不同透水性介质组成的层状岩土层。
The results show that the equivalent isotropic homogeneous aquifer can substitute the layers consisted of different water-permeable media for seepage flow calculation in the layered media.
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