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Measuring water content heterogeneity using multifold GPR with reflection tomography

John H. Bradford
Measuring water content heterogeneity using multifold GPR with reflection tomography (in Ground penetrating radar in hydrogeophysics, Sebastien Lambot (editor), Andrew Binley (editor), Evert Slob (editor) and Susan Hubbard (editor))
Vadose Zone Journal (February 2008) 7 (1): 184-193

Abstract

Continuous multioffset acquisition of ground penetrating radar (GPR) data provides the capability to measure the lateral and vertical distribution of soil moisture. Multioffset data enable measurement of radar velocity, which in turn allows the estimation of soil moisture through an appropriate petrophysical relationship. Although rarely used in GPR investigations, reflection tomography coupled with prestack depth migration has the ability to measure lateral velocity variations with much greater resolution and accuracy than conventional methods of velocity analysis. I used reflection tomography in the post-migration domain to estimate radar velocity and the Topp equation to estimate subsurface moisture distribution in two and three dimensions. At a contaminated site near a former refinery I identified a near-vertical boundary separating coarse-grained sands and gravels from a unit containing a high fraction of silts and clays. At a chlorinated solvent waste site, I found significant heterogeneity in the moisture content distribution despite apparent homogeneity indicated by direct push methods.


ISSN: 1539-1663
Serial Title: Vadose Zone Journal
Serial Volume: 7
Serial Issue: 1
Title: Measuring water content heterogeneity using multifold GPR with reflection tomography
Title: Ground penetrating radar in hydrogeophysics
Author(s): Bradford, John H.
Author(s): Lambot, Sebastieneditor
Author(s): Binley, Andreweditor
Author(s): Slob, Everteditor
Author(s): Hubbard, Susaneditor
Affiliation: Boise State University, Center for Geophysical Investigation of the Shallow Subsurface, Boise, ID, United States
Affiliation: Universite Catholique de Louvain, Department of Environmental Sciences and Land Use Planning, Louvain-la-Neuve, Belgium
Pages: 184-193
Published: 200802
Text Language: English
Publisher: Soil Science Society of America, Madison, WI, United States
References: 32
Accession Number: 2008-082425
Categories: Applied geophysicsEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Presented at the 75th International meeting of the Society of Exploration Geophysicists, 2004, Houston, TX
Illustration Description: illus. incl. 2 tables
N39°01'60" - N39°17'60", W84°49'60" - W84°40'00"
N45°51'00" - N46°42'00", W119°52'00" - W118°57'00"
Secondary Affiliation: Lancaster University, GBR, United KingdomDelft University of Technology, NLD, NetherlandsLawrence Berkeley National Laboratory, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Soil Science Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200824
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