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High resolution characterization of vadose zone dynamics using cross-borehole radar.

Binley, Andrew M. and Middleton, Roy and Parker, Magdeline and Winship, Peter (2001) High resolution characterization of vadose zone dynamics using cross-borehole radar. Water Resources Research, 37 (11). pp. 2639-2652.

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Abstract

Characterization of the dynamics of moisture migration in the unsaturated zone of aquifers is essential if reliable estimates of the transport of pollutants threatening such aquifers are to be made. Electrical geophysical investigation techniques, such as ground-penetrating radar, offer suitable methods for monitoring moisture content changes in the vadose zone. Moreover, these tools permit relatively large measurement scales, appropriate for hydrological models of unsaturated processes, and thus they offer a distinct advantage over conventional measurement approaches. Ground-penetrating radar, when applied in transmission mode between boreholes, can provide high-resolution information on lithological and hydrological features. The technique may be applied in tomographic mode and in a much simpler vertical profile mode. Both modes of measurement have been utilized using two boreholes 5 m apart located at a field site in the UK Sherwood Sandstone aquifer. Radar transmission measurements have been used to characterize the change in moisture content in unsaturated sandstone due to controlled water tracer injection. Continual monitoring of cross-borehole radar measurements over an 18 month period has also permitted determination of travel times of natural loading to the system and has revealed the impact of subtle contrasts in lithology on changes in moisture content over time. The time series of inferred moisture contents show clearly wetting and drying fronts migrating at a rate of approximately 2 m month−1 throughout the sandstone.

Item Type: Article
Journal or Publication Title: Water Resources Research
Additional Information: Binley was PI on this collaborative project between Lancaster and Leeds. Lancaster led all field-based activities, modelling and interpretation. Winship was research assistant and Middleton was PhD student. The paper led to several other studies applying radar for vadose zone characterisation RAE_import_type : Journal article RAE_uoa_type : Earth Systems and Environmental Sciences
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 2071
Deposited By: ep_importer
Deposited On: 09 Apr 2008 09:21
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:39
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/2071

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