Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 406889
Title Heterogeneous water flow and pesticide transport in cultivated sandy soils : description of model concepts
Author(s) Leistra, M.; Boesten, J.J.T.I.
Source Wageningen : Alterra (Alterra-report 2182) - 64
Department(s) CWC - Environmental Risk Assessment
Publication type Research report
Publication year 2011
Keyword(s) zandgronden - pesticiden - uitspoelen - grondwater - simulatiemodellen - preferente stroming - sandy soils - pesticides - leaching - groundwater - simulation models - preferential flow
Categories Soil Physics
Abstract There is ample experimental evidence that complications in water flow and pesticide transport can occur in cultivated humic-sandy and loamy-sandy soils. As a result, pesticide leaching to groundwater and water courses can be higher than expected. We made an inventory of mechanistic/deterministic model concepts that may be suitable for simulating preferential water flow and pesticide transport in these soils. The convection-dispersion approach, the mobile-stagnant concept, the dual-velocity concept, the explicit description of horizontal diffusion, the soil column approach and a concept of finger flow are discussed. Only for comparatively simple concepts it is feasible to ever obtain the parameter values. Ideally, the data sets to be used for testing the models concepts should be detailed and complete. Discrimination between the validity of the model concepts requires the variation in the measuring results to be limited. Testing of the model concepts under various representative field conditions is needed, to gain confidence in their results.
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