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 390298
Title Parameterization of Macropore Flow Using Dye-Tracer Infiltration Patterns in the SWAP Model
Author(s) Schaik, N.L.M.B.; Hendriks, R.F.A.; Dam, J.C. van
Source Vadose Zone Journal 9 (2010)1. - ISSN 1539-1663 - p. 95 - 106.
DOI https://doi.org/10.2136/vzj2009.0031
Department(s) Alterra - Centre for Water and Climate
CWC - Integrated Water Resources Management
Soil Physics, Ecohydrology and Groundwater Management
WIMEK
ALTERRA Wageningen UR
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) preferential flow - solute transport - system extremadura - scale variation - soil profiles - water - spain - methodology - hillslopes - catchment
Abstract Preferential flow is known to influence infiltration, soil moisture content distribution, groundwater response, and runoff generation. Various model concepts are used to simulate preferential flow. Preferential flow parameters are often determined by indirect optimization using outflow or discharge measurements, thereby providing limited insight into model performance concerning soil moisture distribution. In this study, we used a physically based macropore concept, embedded in the SWAP model, in combination with dye infiltration patterns to parameterize macropore infiltration for three locations in a catchment: hilltop, hillslope, and valley bottom. The model with the calibrated macropore parameters was applied and validated under natural field conditions, using detailed data on soil moisture content, rainfall, and discharge. The results show that the macropore model parameters can be optimized well to reproduce the dye-tracer infiltration patterns. The simulations of the dye patterns show much better results when macropore flow is included. Using the tracer infiltration patterns, however, the optimized maximum depth of macropores depends completely on the maximum depth of the stained area, while the macropores are known to extend deeper into the soil. Therefore, for long-term simulations, the wetting of deeper layers is too slow for the simulations both with and without macropores. Runoff production was better simulated with macropores. For the simulations without macropores, a higher lumped saturated conductivity was used; despite the resulting increased infiltration into the soil matrix, runoff generation remained far too high
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