Physical and Numerical Modelling of a Two-Well Tracer Test at the Laboratory Scale
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- 作者：Christophe Frippiat ; Beno?t Wauters ; Vincent Feller ; Patrick Conde ; Mohammed Talbaoui ; et al.
- 关键词：two ; well tracer test ; large ; scale laboratory sample ; soil heterogeneity
- 刊名：Lecture Notes in Earth Sciences
- 出版年：2004
- 出版时间：2004
- 年：2004
- 卷：104
- 期：1
- 页码：pp.285-293
- 全文大小：264 KB
文摘
Two-well tracer tests were performed at the laboratory scale on a large hand-compacted Bruxellian sand sample (about 2 m3), using electrical sensors buried in the soil and placed in piezometers to monitor solute concentrations. First, heterogeneity within the soil was investigated using simple one-dimensional transport experiments. Deduced perme ability values showed some non-negligible variations, that had to be taken into account when interpreting two-dimensional experiments. A numerical model was then developed under Modflow®, in order to simulate two-well tracer test recovery curves under heterogeneous soil conditions. Comparison of numerical results and experimental data highlighted the need for a sufficiently refined measurement grid, as phenomena occurring in zones where fewer sensors were installed were not well simulated.