Water retention & electrical conductivity (dataset)

Water retention & electrical conductivity

DOI:10.4121/uuid:b81aada2-f8bc-41e6-881a-d81be724245a

Datacite citation style:

Albrecht Weerts (2014): Water retention & electrical conductivity. Version 1. 4TU.ResearchData. dataset. https://doi.org/10.4121/uuid:b81aada2-f8bc-41e6-881a-d81be724245a

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Dataset

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2091

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Keywords

dissertation electrical conductivity geochemistry geohydrology Mualem-Friedman tortuosity model water retention curve

Geolocation

Appelscha, NL, Wageningen, NL,

Time coverage

1997

Licence

4TU General Terms of Use

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by Albrecht Weerts

This dataset was measured by AH Weerts as part of the PhD thesis. It consists of combined measurements of water retention and electrical conductivity of two sandy soils. The data was used for a publication in Water Resources Research in 1999 which contains a description of the method used. Abstract: A conceptual model that accounts for the influence of pore geometry is needed to obtain soil water conductivity from bulk soil electrical conductivity measurements in unsaturated soils. Mualem and Friedman [1991] proposed such a model, based on the hypothesis that the tortuosity factor affecting bulk soil electrical conductivity is identical to that defined for prediction of soil hydraulic conductivity. Soil water retention curves (model input) and bulk soil electrical conductivity (model output) of two soils were measured simultaneously over a wide range of soil water conductivity using a multistep outflow (MSO) experiment in combination with time domain reflectometry. The model with only one free parameter can describe the measured data. Predictions indicate a large dependence of the model outcome on the value of the fitting parameter. The fitted tortuosity parameters were used for inverse modeling of the water flow during the MSO experiments, obtaining unique estimates of the hydraulic conductivity.