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Frequency Dependent Attenuation of GPR Data as a Tool for Material Property Characterization: A Review and New Developments, 6th International Workshop on Advanced Ground Penetrating Radar (2011)
Variations in the spectrum of a ground-penetrating radar signal record characteristics of the material through...
Electromagnetic Induction Calibration Using Antenna Transfer Functions (with D. Moghadas, F. Andre, H. Vereecken, and S. Lambot), 73rd European Association of Geoscientists and Engineers Conference and Exhibition (2011)
The present commercial Electromagnetic induction (EMI) instruments applied for soil mapping have some limitations. Due...
Vertical Extension of the Subglacial Drainage System into Basal Crevasses (with Joel T. Harper, Neil F. Humphrey, and Toby W. Meierbachtol), Nature (2010)
Water plays a first-order role in basal sliding of glaciers and ice sheets and is...
2D Ground-Penetrating Radar AVO Response to a 3D Dielectric Permittivity Anomaly, 13th International Conference on Ground Penetrating Radar (2010)
To evaluate the amplitude vs offset response of GPR to small distributions of hydrocarbon contamination,...
Ground-Penetrating-Radar Reflection Attenuation Tomography with an Adaptive Mesh (with Emily A. Hinz), Geophysics (2010)
Ground-penetrating radar (GPR) attenuation-difference analysis can be a useful tool for studying fluid transport in...
Assessing the Potential to Detect Oil Spills In and Under Snow Using Airborne Ground-penetrating Radar (with David F. Dickens and Per Johan Brandvik), Geophysics (2010)
With recent increased interest in oil and gas exploration and development in the Arctic comes...
The Lower Cretaceous King Lear Formation, Northwest Nevada: Implications for Mesozoic Orogenesis in the Western U.S. Cordillera (with Aaron J. Martin, Sandra J. Wyld, and James E. Wright), Geological Society of America Bulletin (2010)
Cretaceous paleogeography of the U.S. Cordillera west of the Sevier fold-and-thrust belt is poorly...
Evidence for Composite Hydraulic Architecture in an Active Fault System Based on 3D Seismic Reflection, Time-Domain Electromagnetics and Temperature Data (with Scott Hess, Jerry P. Fairley, Mitch Lyle, and William Clement), Near Surface Geophysics (2009)
Fault hydrology is a topic of scientific and practical importance but considerable uncertainty exists regarding...
A Radar Transparent Layer in a Temperate Valley Glacier: Bench Glacier, Alaska (with Joel Brown and Joel Harper), Earth Surface Processes and Landforms (2009)
Radar surveys of Bench Glacier, Alaska, collected over five field seasons between 2002 and 2006...
Complex Dielectric Permittivity Measurements from Ground-penetrating Radar Data to Estimate Snow Liquid Water Content in the Pendular Regime (with Joel T. Harper and Joel Brown), Water Resources Research (2009)
Monitoring the snow water equivalent (SWE) is critical to effective management of water resources in...
Continuous Profiles of Electromagnetic Wave Velocity and Water Content in Glaciers: An Example from Bench Glacier, Alaska, USA (with Joshua Nichols, T. Dylan Mikesell, and Joel T. Harper), Annals of Glaciology (2009)
We conducted two-dimensional continuous multi-offset georadar surveys on Bench Glacier, south-central Alaska, USA, to measure...
Multi-Offset GPR Methods for Hyporheic Zone Investigations (with T. R. Brosten, James P. McNamara, Michael N. Gooseff, Jay P. Zarnetske, William B. Bowden, and Morgan E. Johnston), Near Surface Geophysics (2009)
Porosity of stream sediments has a direct effect on hyporheic exchange patterns and rates. Improved...
Estimating 3D Variation in Active-Layer Thickness Beneath Arctic Streams Using Ground-Penetrating Radar (with Troy R. Brosten, James P. McNamara, Michael N. Gooseff, Jay P. Zarnetske, William B. Bowden, and Morgan E. Johnston), Journal of Hydrology (2009)
We acquired three-dimensional (3D) ground-penetrating radar (GPR) data across three stream sites on the North...
Improved GPR Interpretation Through Resolution of Lateral Velocity Heterogeneity: Example from an Archaeological Site Investigation (with Joel Brown, Josh Nichols, and Leah Steinbronn), Journal of Applied Geophysics (2009)
In a typical common-offset ground-penetrating radar (GPR) survey, lateral velocity contrasts may go undetected leading...
Estimating Porosity with Ground-Penetrating Radar Reflection Tomography: A Controlled 3-D Experiment at the Boise Hydrogeophysical Research Site (with William P. Clement and Warren Barrash), Water Resources Research (2009)
To evaluate the uncertainty of water-saturated sediment velocity and porosity estimates derived from surface-based, ground-penetrating...
Air Compression as a Mechanism for the Underdamped Slug Test Response in Fractured Glacier Ice (with Toby W. Meierbachtol, Joel T. Harper, Neil F. Humphrey, and Jeremy Shaha), Journal of Geophysical Research (2008)
Artificial perturbations of borehole water levels, known as slug tests, are a useful means of...
Locating Oil Spills Under Sea Ice Using Ground-Penetrating Radar (with Lee M. Liberty and David F. Dickens), The Leading Edge (2008)
The accelerating level of interest in arctic oil and gas exploration was demonstrated in the...
Comparison of In-Channel Mobile–Immobile Zone Exchange During Instantaneous and Constant Rate Stream Tracer Additions: Implications for Design and Interpretation of Non-Conservative Tracer Experiments (with Michael N. Gooseff, Robert A. Payn, Jay P. Zarnetske, William B. Bowden, and James P. McNamara), Journal of Hydrology (2008)
The stream tracer experiment, including field tracer application and subsequent analysis of solute transport and...
Hyporheic Exchange and Water Chemistry of Two Arctic Tundra Streams of Contrasting Geomorphology (with Morgan J. Greenwald, William B. Bowden, Michael N. Gooseff, Jay P. Zarnetske, James P. McNamara, and Troy R. Brosten), Journal of Geophysical Research (Biogeosciences) (2008)
The North Slope of Alaska’s Brooks Range is underlain by continuous permafrost, but an active...
Comparison of Instantaneous and Constant-Rate Stream Tracer Experiments through Parametric Analysis of Residence Time Distributions (with Robert A. Payn, Michael N. Gooseff, David A. Benson, Olaf A. Cirpka, Jay P. Zarnetske, W. Breck Bowden, and James P. McNamara), Water Resources Research (2008)
Artificial tracers are frequently employed to characterize solute residence times in stream systems and infer...
Sediment and Nutrient Delivery from Thermokarst Features in the Foothills of the North Slope, Alaska: Potential Impacts on Headwater Stream Ecosystems (with W. B. Bowden, M. N. Gooseff, A. Balser, A. Green, and B. J. Peterson), Journal of Geophysical Research (Biogeosciences) (2008)
Permafrost is a defining characteristic of the Arctic environment. However, climate warming is thawing permafrost...
Measuring Water Content Heterogeneity Using Multifold GPR with Reflection Tomography, Vadose Zone Journal (2008)
Continuous multioffset acquisition of ground penetrating radar (GPR) data provides the capability to measure the...
Influence of Morphology and Permafrost Dynamics on Hyporheic Exchange in Arctic Headwater Streams under Warming Climate Conditions (with Jay P. Zarnetske, Michael N. Gooseff, W. Breck Bowden, Morgan J. Greenwald, Troy R. Brosten, and James P. McNamara), Geophysical Research Letters (2008)
We investigated surface-subsurface (hyporheic) exchange in two morphologically distinct arctic headwater streams experiencing warming (thawing)...
Imaging Thermal Stratigraphy in Freshwater Lakes Using Georadar (with Cody R. Johnson, Troy Brosten, James P. McNamara, and Michael N. Gooseff), Geophysical Research Letters (2007)
Thermal stratification exerts significant control over biogeochemical processing in freshwater lakes. Thus, the temporal and...
Instantaneous Spectral Analysis: Time-Frequency Mapping via Wavelet Matching with Application to Contaminated-site Characterization by 3D GPR (with Yafei Wu), The Leading Edge (2007)
Spectral decomposition, by which a time series is transformed from the 1D time/amplitude domain to...
Transient Storage as a Function of Geomorphology, Discharge, and Permafrost Active Layer Conditions in Arctic Tundra Streams (with Jay P. Zarnetske, Michael N. Gooseff, Troy R. Brosten, James P. McNamara, and W. Breck Bowden), Water Resources Research (2007)
Transient storage of solutes in hyporheic zones or other slow-moving stream waters plays an important...
Frequency-Dependent Attenuation Analysis of Ground-Penetrating Radar Data, Geophysics (2007)
In the early 1990s, it was established empirically that, in many materials, ground-penetrating radar (GPR)...
Profiles of Temporal Thaw Depths Beneath Two Arctic Stream Types Using Ground-Penetrating Radar (with Troy R. Brosten, James P. McNamara, Jay P. Zarnetske, Michael N. Gooseff, and W. Breck Bowden), Permafrost and Periglacial Processes (2006)
Thaw depths beneath arctic streams may have significant impact on the seasonal development of hyporheic...
Imaging Complex Structure in Shallow Seismic-reflection Data Using Prestack Depth Migration (with Lee M. Liberty, Mitch W. Lyle, William P. Clement, and Scott Hess), Geophysics (2006)
Prestack depth migration (PSDM) analysis has the potential to significantly improve the accuracy of both...
Ground-Penetrating Radar Theory and Application of Thin-Bed Offset-Dependent Reflectivity (with Jacob C. Deeds), Geophysics (2006)
Offset-dependent reflectivity or amplitude-variationwith- offset (AVO) analysis of ground-penetrating radar (GPR) data may improve the...
Applying Reflection Tomography in the Postmigration Domain to Multifold Ground-Penetrating Radar Data, Geophysics (2006)
Acquisition and processing of multifold ground-penetrating radar (GPR) data enable detailed measurements of lateral velocity...
Wave Field Migration as a Tool for Estimating Spatially Continuous Radar Velocity and Water Content in Glaciers (with Joel T. Harper), Geophysical Research Letters (2005)
Normal-moveout velocity analysis can lead to significant overestimates of the velocity structure of temperate glaciers...
Measuring Thaw Depth Beneath Peat-Lined Arctic Streams Using Ground-Penetrating Radar (with James P. McNamara, William Bowden, and Michael N. Gooseff), Hydrological Processes (2005)
In arctic streams, depth of thaw beneath the stream channel is likely a significant parameter...
Depth Characterization of Shallow Aquifers with Seismic Reflection, Part II—Prestack Depth Migration and Field Examples (with D. S. Sawyer), Geophysics (2002)
It is common in shallow seismic studies for the compressional-wave velocity in unconsolidated sediments to...
Depth Characterization of Shallow Aquifers with Seismic Reflection, Part I—The Failure of NMO Velocity Analysis and Quantitative Error Prediction, Geophysics (2002)
As seismic reflection data become more prevalent as input for quantitative environmental and engineering studies,...