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重金属污染场地电阻率法检测数值模拟及反演研究
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摘要
本文对重金属污染场地的电阻率法检测技术进行了研究,建立了相应的探测模型;通过求解稳恒电流场,分析了重金属污染场地在不同污染程度、不同污染深度和不同地质条件下的电阻率法探测效果。结合地下水运移模型、溶质运移模型和稳恒电流场建立了污染场地的实时监测模型,并通过数值计算方法求解了该模型下电阻率在不同时刻的探测结果,为基于电阻率法的污染场地监测方案设计和结果解释提供了有益的参考。在此基础上,研究了电阻率法中两种常用的反演算法——阻尼最小二乘法和平滑约束最小二乘法,对合成模型的视电阻率数据进行了反演。结果显示:在纵深方向上的反演结果不准确。为此,提出了基于钻孔信息确定参考模型的方法,以参考模型作为约束条件进行反演,提高了纵深方向上反演结果的准确性。
In this paper, the heavy metal contaminated sites resistivity method detectiontechnology is the main study object, heavy metal contaminated sites resistivitymethod detection model is built, and through solving the steady current field, analysisof resistivity method to detect the effect of different pollution levels of heavy metalcontaminated sites, pollution depth, and different geological conditions. Combinedwith groundwater transport model, solute transport model and steady current field toestablish the model of the real-time monitoring of contaminated sites, it provide auseful reference for designing plan and interpretation of results of resistivity methodfor monitoring of contaminated sites, though the numerical method to find outresistivity detection results at different times. On this basis, two kinds of commonresistivity method anti algorithm-damped least squares method and the smoothconstrained least squares inversion of the synthetic model apparent resistivity datainversion, the results point out that inversion results are not accurate in the depthdirection, and propose an inversion algorithm based on drilling information todetermine the reference model, improve accuracy of the inversion results on the depthside.
引文
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