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Reprint of “Multi-step and two-step experiments in heterogeneous porous media to evaluate the relevance of dynamic effects” |
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| Authors: | H-J Vogel A Samouëlian O Ippisch |
| Institution: | 1. UFZ Helmholtz Center for Environmental Research Leipzig-Halle, Theodor-Lieser-Strasse 4, 06120 Halle, Saale, Germany;2. Institute for Environmental Physics, University of Heidelberg, Im Neuenheimer Feld 224, 69120 Heidelberg, Germany;3. INRA Orléans, Soil Science, BP 20619, 45166 Olivet, France;4. University of Stuttgart, Institute of Parallel and Distributed Systems, Universitätsstrasse 38, 70569 Stuttgart, Germany |
| Abstract: | The determination of hydraulic properties in non-stationary experiments is suspected to be affected by dynamic effects. This is based on thermodynamic considerations on the pore scale displacement of wetting and non-wetting phase. But also macroscopic heterogeneities at the continuum scale may influence the dynamics of water during drainage and wetting. In this paper we investigate both aspects. Firstly, we present the results of typical multi-step outflow experiments in heterogeneous sand columns which are compared with two-step outflow experiments covering the same pressure range. The discrepancies caused by pressure steps of different size reveal the impact of dynamic effects due to the non-stationarity of the experiments. |
| Keywords: | Soil hydraulic properties Dynamic effects Multi-step-outflow Unsaturated flow Spatial heterogeneity |
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