Pedosphere 10(4): 323--332, 2000
ISSN 1002-0160/CN 32-1315/P
©2000 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Impact of soil water flux on vadose zone solute transport parameters |
| CHEN Xiao-Min1, M. VANCLOOSTER2 and PAN Gen-Xing1 |
1 College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China);
2 Department of Environmental Sciences and Land Use Planning, University Catholique de Louvain, B-1348 Louvain-la-Neuve (Belgium) |
| ABSTRACT |
| The transport processes of solutes in two soil columns filled with undisturbed soil material collected from an unsaturated sandy aquifer formation in Belgium subjected to a variable upper boundary condition were identified from breakthrough curves measured by means of time domain reflectometry (TDR). Solute breakthrough was measured with 3 TDR probes inserted into each soil column at three different depths at a 10 minutes time interval. In addition, soil water content and pressure head were measured at 3 different depths. Analytical solute transport models were used to estimate the solute dispersion coefficient and average pore-water velocity from the observed breakthrough curves. The results showed that the analytical solutions were suitable in fitting the observed solute transport. The dispersion coefficient was found to be a function of the soil depth and average pore-water velocity, imposed by the soil water flux. The mobile moisture content on the other hand was not correlated with the average pore-water velocity and the dispersion coefficient. |
| Key Words: dispersion coefficient, pore-water velocity, solute transport, time domain reflectometry (TDR) |
| Citation: Chen, X. M., Vanclooster, M. and Pan, G. X. 2000. Impact of soil water flux on vadose zone solute transport parameters. Pedosphere. 10(4): 323-332. |
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