Impact of the entrapped air on water flow and solute transport in heterogeneous soil: Experimental set-up | Vliv uzavřeného vzduchu na proudení vody a transport látek v heterogénni pude: experimentální sestava
2008
Snehota, M., Czech Technical University in Prague, Prague (Czech Republic) | Sobotkova, M., Czech Technical University in Prague, Prague (Czech Republic) | Cislerova, M., Czech Technical University in Prague, Prague (Czech Republic)
Changes of steady state water flow rates and the bromide breakthrough were observed in laboratory infiltration experiments done on a sample of compacted sand and on an undisturbed soil sample (Eutric Cambisol). Infiltration-outflow experiments consisted of series of ponded infiltration runs with seepage face boundary condition at the lower end of columns. The initial water contents were different for each run. The results of the experiment done on an undisturbed soil column showed that the flux rates and water contents measured during quasi-steady state differ between infiltration runs. This finding contradicts the standard theory. The fluctuations of the water content during the steady state flow can be ascribed to the variations in volume of the entrapped air. Similarly, bromide breakthrough curves performed during the steady state flow runs differ for the undisturbed soil sample. The same behaviour was not observed in the sample of homogeneous sand. Computer tomography was utilized to characterize the structure of the undisturbed soil sample with focus on potential preferential flow pathways. To formulate more general conclusions, the infiltration outflow and bromide solute transport experiments have to continue with the aim to collect a representative set of data.
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