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Global multiquadric collocation method for groundwater contaminant source identification

机译:地下水污染物源识别的全局多二次搭配方法

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摘要

In this paper, a radial basis collocation method (RBCM) based on the global space-time multiquadric (GST-MQ) is developed to solve the inverse problem of groundwater contaminant source identification. This deterministic method directly induces the problem to a single-step solution of a system of linear algebraic equations in the entire space-time domain. The least-square-based radial basis collocation method (LS-RBCM) is introduced to overcome the ill-posedness of the linear system. To increase confidence in the GST-MQ solutions, the sensitivity analysis with respect to calculation parameters, observation data and model uncertainty is investigated. The performance of the application examples of contaminant source identification in one- and two-dimensional porous media demonstrates that the proposed method poses the meshfree advantage and direct identification of contaminant source with efficient methodology. The GST-MQ method provides a robust tool for estimating spatial plume distribution as well as the release history of groundwater contaminant source from concentration measurements.
机译:本文提出了一种基于全局时空多二次方(GST-MQ)的径向基配置法(RBCM)来解决地下水污染物源识别的反问题。这种确定性方法将问题直接引到整个时空域中的线性代数方程组的单步求解。为了克服线性系统的不适定性,引入了基于最小二乘的径向基配置法(LS-RBCM)。为了增加对GST-MQ解决方案的信心,我们针对计算参数,观测数据和模型不确定性进行了敏感性分析。一维和二维多孔介质中污染物源识别应用实例的性能表明,所提出的方法具有无网格的优点,并且可以通过有效的方法直接识别污染物源。 GST-MQ方法提供了一个强大的工具,可用于根据浓度测量值估算空间羽流分布以及地下水污染物源的释放历史。

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