| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Inst. for Land and Water Management, Katholieke Universiteit Leuven, Vital Decosterstraat 102, 3000 Leuven, Belgium
Commission of the European Communities, Wetstraat 100, 5/152, Brussels, Belgium
* Corresponding author ( marnik.vanclooster{at}agr.kuleuven.ac.be).
ABSTRACT
The lack of detailed and high-quality experimental data on the fate of solutes in soil puts a severe constraint on the development and testing of transport models. This study illustrates how detailed measured solute concentration data, collected by means of time domain reflectometry (TDR), are used to identify the governing transport processes in a vertical heterogeneous soil. A lysimeter was constructed, consisting of an undisturbed three-layered soil monolith placed on an artificial sandy soil column. Tensiometer cups and solution samplers, together with TDR probes, were inserted horizontally at regular depth intervals to monitor pressure head, solution concentrations, soil water content, and bulk electrical conductivity. In the lysimeter, quasi-steady-state unsaturated water flow conditions were established and TDR-estimated transport of solute was monitored during leaching. Solute fluxes at different depths were calculated, resulting in probability density functions of solute travel time to different depths. The first moment of the solute travel time revealed that approximately all soil water was used to transport solute in the top of the lysimeter. The boundary between the top soil and the sandy substratum probably induced instabilities, and hence, preferential flow. The dispersivity increased with depth in the topsoil but approached almost a constant value deeper in the lysimeter.
Received for publication January 13, 1994.
This article has been cited by other articles:
|
|
 |
|
  M. Javaux, R. Kasteel, J. Vanderborght, and M. Vanclooster Interpretation of Dye Transport in a Macroscopically Heterogeneous, Unsaturated Subsoil with a One-Dimensional Model Vadose Zone J., April 27, 2006; 5(2): 529 - 538. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Ritter, R. Munoz-Carpena, C. M. Regalado, M. Javaux, and M. Vanclooster Using TDR and Inverse Modeling to Characterize Solute Transport in a Layered Agricultural Volcanic Soil Vadose Zone J., May 12, 2005; 4(2): 300 - 309. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Gaur, A. Gaur, R. Horton, D. B. Jaynes, J. Lee, and S. A. Al-Jabri Using Surface Time Domain Reflectometry Measurements to Estimate Subsurface Chemical Movement Vadose Zone J., November 1, 2003; 2(4): 539 - 543. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 G. N. Magesan, I. Vogeler, B. E. Clothier, S. R. Green, and R. Lee Solute Movement through an Allophanic Soil J. Environ. Qual., November 1, 2003; 32(6): 2325 - 2333. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. Javaux and M. Vanclooster Scale- and Rate-Dependent Solute Transport within an Unsaturated Sandy Monolith Soil Sci. Soc. Am. J., September 1, 2003; 67(5): 1334 - 1343. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Lu and L. Wu Visualizing Bromide and Iodide Water Tracer in Soil Profiles by Spray Methods J. Environ. Qual., January 1, 2003; 32(1): 363 - 367. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Javaux and M. Vanclooster Robust Estimation of the Generalized Solute Transfer Function Parameters Soil Sci. Soc. Am. J., January 1, 2003; 67(1): 81 - 91. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Vanderborght, A. Timmerman, and J. Feyen Solute Transport for Steady-State and Transient Flow in Soils with and without Macropores Soil Sci. Soc. Am. J., July 1, 2000; 64(4): 1305 - 1317. [Abstract] [Full Text]
|
|
|
|
|
|
H.H. Nissen, P. Moldrup, and R.G. Kachanoski Time Domain Reflectometry Measurements of Solute Transport across a Soil Layer Boundary Soil Sci. Soc. Am. J., January 1, 2000; 64(1): 62 - 74. [Abstract] [Full Text]
|
|
|
|
|
|
B. S. Das, J. M. Wraith, and W. P. Inskeep Nitrate Concentrations in the Root Zone Estimated Using Time Domain Reflectometry Soil Sci. Soc. Am. J., November 1, 1999; 63(6): 1561 - 1570. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K.R. Wythers, W.K. Lauenroth, and J.M. Paruelo Bare-Soil Evaporation Under Semiarid Field Conditions Soil Sci. Soc. Am. J., September 1, 1999; 63(5): 1341 - 1349. [Abstract] [Full Text]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Crop Science | |||
| Journal of Natural Resources and Life Sciences Education |
Vadose Zone Journal | ||||
| Journal of Plant Registrations | Journal of Environmental Quality |
The Plant Genome | |||
