Comparison of Heterogeneous Transport Processes Observed with Electrical Resistivity Tomography in Two Soils
(2010) Vadose Zone Journal — Vol. 9, n° 2, p. 336-349 (2010)
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- Abstract
- Preferential flow in soils can manifest itself in several ways. To illustrate this, we analyzed solute transport during a step tracer experiment in two soils expected to differ in their governing transport processes: a loamy sand and a silty soil. By combining electrical resistivity tomography (ERT), time domain reflectometry, and effluent measurements, we observed different preferential flow phenomena. The transport process was characterized using voxel- and column-scale effective convective-dispersive equation (CDE) parameters, local velocities, and leaching surfaces. At the column scale, transport in the loamy sand was dominated by a homogenous convective-dispersive transport behavior, but at the scale of the voxel, preferential transport was observed. Transport in the silty soil was considerably more heterogeneous. Preferential flow was identified using ERT, voxel- and column-scale effective CDE parameters, local velocities, and leaching surfaces. In these soils, a clear influence of soil layering on solute transport was observed.
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Garre, S., Koestel, J., Guenther, T., Javaux, M., Vanderborght, J., & Vereecken, H. (2010). Comparison of Heterogeneous Transport Processes Observed with Electrical Resistivity Tomography in Two Soils. Vadose Zone Journal, 9(2), 336-349. https://doi.org/10.2136/vzj2009.0086 (Original work published 2010)