Abstract
A process-based modelling approach of organic contaminant spreading is presented, which allows to quantify the increase of groundwater pollution risk due to preferential flow and particle-facilitated transport in the vadose zone. Both effects are illustrated by means of a parameter study based on realistic input data. When coupled with biodegradation, preferential flow and particle-facilitated transport lead to an increase in the long-term concentration to be expected at the groundwater table as both processes reduce the bioavailability of the contaminant due to either shorter residence times (preferential flow) or lower accessibility (particle-facilitated transport). Model predictions account for the amount and the velocity of preferential flow as well as the potentially kinetic interaction between organic contaminant and mobile particles.
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© 2005 Springer-Verlag Berlin Heidelberg
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Bold, S., Liedl, R., Grathwohl, P. (2005). Enhancement of solute spreading in soils due to particle-facilitated transport and preferential flow. In: Nützmann, G., Viotti, P., Aagaard, P. (eds) Reactive Transport in Soil and Groundwater. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-26746-8_11
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DOI: https://doi.org/10.1007/3-540-26746-8_11
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-26744-7
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