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Title:
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Prediction and experimental validation of liquid phase diffusionresistance in unsaturated soils
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Author(s):
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Published by:
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Publication date:
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ECN
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1995
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ECN report number:
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Document type:
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ECN-RX--95-009
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Other
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Number of pages:
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Full text:
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37
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Download PDF
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Abstract:
Determination of liquid phase diffusion through unsaturated soils isimportant for estimating contaminant transport in soils and design of
remediation processes for contaminated soils and groundwater. Liquid phase
diffusion through unsaturated soils is governed by both the pore size
distribution and water distribution of the soil matrix. Diffusion tube
experiments were carried out using several soils packed to field densities to
determine the effective diffusivity of chloride ion as a function of soil
moisture content. Chloride was selected to serve as a non-volatile,
non-sorbing tracer species. A transport model was developed to predict liquid
phase tortuosity as a function of readily obtained soil parameters, including
density, moisture content, particle size distribution and pore size
distribution. The basis of the model is parallel diffusion resistances
between inter- and intra-particle pore regimes. The new model was found to
provide an accurate prediction of observed experimental results. Previously
reported models did not agree with experimental results over significant
portions of the experimental domain investigated. 10 figs., 3 tabs., 1
appendix, 32 refs.
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