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首页> 外文会议>Int. Symposium on Heat Transfer >PREDICTION OF CONTAMINANT CONCENTRATION UPSTREAM OF GROUNDWATER FLOWS : AN INVERSE MASS TRANSFER PROBLEM
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PREDICTION OF CONTAMINANT CONCENTRATION UPSTREAM OF GROUNDWATER FLOWS : AN INVERSE MASS TRANSFER PROBLEM

机译：地下水流量上游污染物浓度的预测：逆传质问题

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A numerical study is made of the inverse mass transfer problem in groundwater flows. Of particular interest is the prediction of the upstream contaminant concentration when measurements of both concentration and its gradient are obtained at some downstream location . To predict the concentration distribution upstream of the measurement location, the space marching finite-difference method is used. The instability associated with the ill-posedness of the problem, i.e. the oscillations of the solution due to random errors in the measured data, is treated by the mollification technique with a low-pass filter . Several numerical examples are presented to show the accuracy of the proposed algorithm. It appears that the present method may faithfully predict the contaminant concentration rather far away from the measurement location if random errors in the given data are carefully smoothed by an appropriate filter.
机译：地下水流动中的反向传质问题进行了数值研究。 特别令人兴趣的是当在一些下游位置获得浓度的测量及其梯度时，预测上游污染物浓度。 为了预测测量位置上游的浓度分布，使用空间进行有限差分方法。 与问题的不良效果相关的不稳定性，即通过测量数据中的随机误差引起的解决方案的振荡是由莫格雷化技术处理的低通滤波器。 提出了几个数值示例以示出所提出的算法的准确性。 如果通过适当的滤波器小心地平滑给定数据中的随机误差，则似乎本方法可以忠实地预测污染物浓度而不是远离测量位置。

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