Three-dimensional spatial moments analysis of the Borden Tracer Test
Three-dimensional spatial moments analysis of the Borden Tracer Test
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Borden Tracer 测试的三维空间矩分析
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
L. Gelhar
中科院分区：
文献类型：
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作者：
H. Rajaram;L. Gelhar
在博登核电站进行的大规模示踪剂测试包括详细的三维羽流监测，但之前的大多数研究都强调从二维意义上解释数据。在这里，使用线性空间内插方案对羽流的全三维性质进行了独立的分析，该方案与早期分析中使用的网格高阶内插方案有很大不同。对数据库的详细检查显示，在几次抽样期间，羽流明显被截断。此功能解释了在随后的采样会话中获得的低质量估计。因此，与相应的二阶矩估计相关的不确定性很大。这种不确定性让人质疑二阶矩演化与随机理论的任何精细比较，但在以前对二阶矩估计的解释中并没有认识到这一点。估计的垂直宏观分散性大约是分子扩散的两倍。估算的横向宏观分散度远大于垂直宏观分散度。流动中的时间变化似乎为大的水平横向宏观分散性提供了一个合理的解释。二阶矩演化的无序行为表明，在测试的后期阶段，大规模非均质性的作用，表明二阶矩分量之间可能存在相互作用。
The large-scale tracer test conducted at the Borden site included detailed three-dimensional plume monitoring, but most previous studies have emphasized the interpretation of the data in a two-dimensional sense. Here, an independent analysis of the fully three-dimensional nature of the plume is developed using a linear spatial interpolation scheme which differs significantly from the gridded higher-order interpolation scheme used in earlier analyses. A detailed examination of the data base reveals significant truncation of the plume during several sampling sessions. This feature explains the low mass estimates obtained during the later sampling sessions. Consequently, there are significant uncertainties associated with the corresponding second-moment estimates. This uncertainty, which calls into question any refined comparisons of second-moment evolution with stochastic theories, has not been recognized in previous interpretations of the second-moment estimates. The estimated vertical macrodispersivity is found to be about twice that attributable to molecular diffusion. The estimated horizontal transverse macrodispersivity is much larger than the vertical macrodispersivity. Temporal variations in the flow appear to provide a plausible explanation of the large horizontal transverse macrodispersivity. Anamolous behavior of the second-moment evolution suggests the role of a large-scale heterogeneity during the later portion of the test, indicating possible mutual interactions between the second-moment components.