Recovering the release history of a groundwater contaminant
Recovering the release history of a groundwater contaminant
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DOI：
10.1029/93wr02656
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发表时间：
1994
影响因子：
5.4
通讯作者：
T. Skaggs;Z. Kabala
中科院分区：
文献类型：
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作者：
T. Skaggs;Z. Kabala
通过测量地下水污染物羽流当前的空间分布来查找地下水污染物羽流的历史是一个不适定问题，因此，其解决方案对输入数据中的错误极其敏感。在本文中，Tikhonov 正则化（Tikhonov 和 Arsenin，1977）用于数值实验，以恢复源自已知单个地点的羽流的释放历史。然后使用恢复的释放历史来重建羽流演化历史。人们发现该方法对舍入误差不敏感，但其准确性受到羽流测量误差、羽流消散程度以及传输参数估计准确性的影响（在较小程度上）。当有足够的数据时，正则化方法可能可以有效地查找羽流历史。
Finding the history of a groundwater contaminant plume from measurements of its current spatial distribution is an ill-posed problem and, consequently, its solution is extremely sensitive to errors in the input data. In this paper, Tikhonov regularization (Tikhonov and Arsenin, 1977) is used in numerical experiments to recover the release history of a plume that has originated from a known, single site. The recovered release history is then used to reconstruct the plume evolution history. The method is found to be insensitive to round off errors, but its accuracy is affected by plume measurement errors, the extent to which the plume has dissipated, and, to a lesser degree, the accuracy of the transport parameter estimates. A regularization approach may be effective at finding a plume history when there are adequate data.