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Published online 8 August 2008
Published in J Environ Qual 37:1909-1917 (2008)
DOI: 10.2134/jeq2006.0200
© 2008 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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TECHNICAL REPORTS

Vadose Zone Processes and Chemical Transport

Hydrogeological Relationships of Sandy Deposits: Modeling of Two-Dimensional Unsaturated Water and Pesticide Transport

Bo V. Iversena,*, Peter van der Keurb and Henrik Vosgeraub,c

a Univ. of Aarhus, Faculty of Agricultural Sciences, Dep. of Agroecology and Environment, Research Centre Foulum, PO Box 50, DK-8830 Tjele, Denmark
b Geological Survey of Denmark and Greenland, Dep. of Hydrology, Øster Voldgade 10, DK-1350 Copenhagen, Denmark
c current address, Miljøcenter Roskilde, Ny Østergade 7-11, DK-4000 Roskilde, Denmark

* Corresponding author (bo.v.iversen{at}agrsci.dk).

Received for publication May 22, 2006. Prediction of the movement of water and solutes in the vadose zone requires information on the distribution of spatial trends and heterogeneities in porous media. The present study describes different lithofacies origination mainly from glaciofluvial deposits. Among different lithofacies, hydrological relationships were investigated. By means of a two-dimensional hydrological model it was evaluated how the flow of water and leaching of metribuzin (4-amino-6-tert-butyl-4,5-dihydro-3-methylthio-1,2,4-triazin-5-one) was affected. Two selected large outcrop sections consisting of glacial outwash deposits were used in the modeling study. Eleven different lithofacies were distinguished and described in terms of texture distribution, sorting, bedding style, and external boundaries based on excavated soil profiles from 27 locations representing seven predominantly sandy landforms in Denmark. Undisturbed soil columns were sampled from each of the lithofacies and brought to the laboratory to be analyzed. With respect to their soil hydraulic properties, the different lithofacies formed four different hydrofacies having relatively homogeneous, hydrogeological properties. Two large outcrop sections from one of the locations (a gravel pit) located near the terminal moraine of the former Weichsel glacier were used for the HYDRUS-2D modeling. Modeling results revealed that the spatial distribution of sedimentary bodies affected water flow and the leaching of metribuzin.

Abbreviations: k, unsaturated hydraulic conductivity • Ks, saturated hydraulic conductivity • CV, coefficient of variation






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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2008 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.