Boundary refine of hydrogeological conceptional model of a groundwater contaminated site in Xinxiang city based on the hydrochemistry and isotope evidence
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摘要: 构建合理的水文地质概念模型对于地下水数值模拟至关重要，概念模型如果确定不合理，整个数值模拟将毫无意义。通常水文地质调查可以大致确定水文地质概念模型，然而对于一些不易被发现的补给源，通过水文地质调查也无法确定。水化学和同位素特征对地下水的补给源及水流路径有很好的指示作用，可以根据这些信息对水文地质概念模型进行细化。文章通过对研究区地下水取样，分析地下水水化学和同位素特征，确定出研究区内不易识别的地下水补给源及顶层黏土-粉质黏土的透水性，最终细化了水文地质概念模型边界条件。这对于后期得到正确的地下水流和溶质运移模拟结果具有重要意义。Abstract: Constructing a rational conceptual model of hydrogeology is very important for the numerical simulation of groundwater. If the conceptual model is not reasonable, the whole numerical simulation will be meaningless. Generally, the conceptual model of hydrogeology can be roughly determined by hydrogeological investigation. However, it cannot be determined by the hydrogeological investigation for some recharge sources which are not easy to be found. The water chemistry and isotope characteristics are good indicators for the groundwater recharge and the flow path. Based on these characteristics, the hydrogeological conceptual model can be refined. In this paper, groundwater sampling and isotopic characteristics of groundwater in the study area were analyzed. Then the concealed groundwater source was identified, and the permeability of the top silty clay layer was determined. On the basis of the above results, the boundary conditions of the conceptual model of hydrogeology were refined. This is of great significance to get the correct simulation results of groundwater flow and solute transport in the later stage.
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