| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
a Agrosphere Institute, ICG IV, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
b Swiss Federal Institute for Environmental Science and Technology (EAWAG), Überlandstrasse 133, 8600 Dübendorf, Switzerland
* Corresponding author (r.kasteel{at}fz-juelich.de)
Received 15 June 2004.
Flow and transport in soils and groundwater are greatly affected by subsurface heterogeneity. We present results from infiltration experiments on four heterogeneous field plots (Orthic Luvisol) for plowed and nonplowed conditions. A 2-mm pulse of Br– was applied, followed by a 40-mm application of a 5 g L–1 solution of the food dye Brilliant Blue FCF (Color Index 42090) in a 6-h period. Horizontal cross sections were photographed at 0.05- and 0.10-m depth intervals, representing the Ap and Bt horizons, respectively, either immediately or 90 d after the tracer application. High-resolution spatial maps of Brilliant Blue concentration were derived from the scanned photographs using one single calibration relationship between Brilliant Blue concentration and the color spectra for all plots and depths. No significant or consistent directional dependence was observed in the spatial correlation structure of the dye concentration for the horizontal cross sections. However, the integral scale showed a distinct depth dependency, partially caused by horizonation, with a larger value in the Ap than in the Bt horizon. Disturbed soil samples were taken at 15 locations for each cross section and analyzed for Br–. Although Brilliant Blue was retarded in the soil matrix with respect to Br–, both tracer concentrations showed an exponential decay with depth because of preferential flow enhanced by plowing. Only a small fraction of the dye was subjected to fast transport. The plot-scale information of the dye distribution revealed that our 15 sampling locations at each depth were sufficient to identify the averaged plot-scale transport behavior in the soil matrix, but failed to represent the conducting preferential flow pathways.
This article has been cited by other articles:
|
|
 |
|
  S. E. Oswald, M. Menon, A. Carminati, P. Vontobel, E. Lehmann, and R. Schulin Quantitative Imaging of Infiltration, Root Growth, and Root Water Uptake via Neutron Radiography Vadose Zone J., August 13, 2008; 7(3): 1035 - 1047. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
H. H. Gerke, J. Dusek, T. Vogel, and J. M. Kohne Two-Dimensional Dual-Permeability Analyses of a Bromide Tracer Experiment on a Tile-Drained Field Vadose Zone J., August 23, 2007; 6(3): 651 - 667. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. Weihermuller, R. Kasteel, and H. Vereecken Soil Heterogeneity Effects on Solute Breakthrough Sampled with Suction Cups: Numerical Simulations Vadose Zone J., July 26, 2006; 5(3): 886 - 893. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
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]
|
|
|
|
|
|
J. Vanderborght, R. Kasteel, and H. Vereecken Stochastic Continuum Transport Equations for Field-Scale Solute Transport: Overview of Theoretical and Experimental Results Vadose Zone J., March 8, 2006; 5(1): 184 - 203. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
