Frederick D. Day-Lewis (Former Employee)
Science and Products
Filter Total Items: 94
A distribution-based parameterization for improved tomographic imaging of solute plumes
Difference geophysical tomography (e.g. radar, resistivity and seismic) is used increasingly for imaging fluid flow and mass transport associated with natural and engineered hydrologic phenomena, including tracer experiments, in situ remediation and aquifer storage and recovery. Tomographic data are collected over time, inverted and differenced against a background image to produce...
Authors
Adam Pidlisecky, K. Singha, Frederick D. Day-Lewis
Use of electrical imaging and distributed temperature sensing methods to characterize surface water–groundwater exchange regulating uranium transport at the Hanford 300 Area, Washington
We explored the use of continuous waterborne electrical imaging (CWEI), in conjunction with fiber‐optic distributed temperature sensor (FO‐DTS) monitoring, to improve the conceptual model for uranium transport within the Columbia River corridor at the Hanford 300 Area, Washington. We first inverted resistivity and induced polarization CWEI data sets for distributions of electrical...
Authors
Lee D. Slater, Dimitrios Ntarlagiannis, Frederick D. Day-Lewis, Kisa Mwakanyamale, Roelof J. Versteeg, Andy Ward, Christopher Strickland, Carole D. Johnson, John Lane
Marine electrical resistivity imaging of submarine groundwater discharge: Sensitivity analysis and application in Waquoit Bay, Massachusetts, USA
Electrical resistivity imaging has been used in coastal settings to characterize fresh submarine groundwater discharge and the position of the freshwater/salt-water interface because of the relation of bulk electrical conductivity to pore-fluid conductivity, which in turn is a function of salinity. Interpretation of tomograms for hydrologic processes is complicated by inversion artifacts...
Authors
Rory Henderson, Frederick D. Day-Lewis, Elena Abarca, Charles F. Harvey, Hanan N. Karam, Lanbo Liu, John Lane
Improved hydrogeophysical characterization and monitoring through parallel modeling and inversion of time-domain resistivity andinduced-polarization data
Electrical geophysical methods have found wide use in the growing discipline of hydrogeophysics for characterizing the electrical properties of the subsurface and for monitoring subsurface processes in terms of the spatiotemporal changes in subsurface conductivity, chargeability, and source currents they govern. Presently, multichannel and multielectrode data collections systems can...
Authors
Timothy C. Johnson, Roelof J. Versteeg, Andy Ward, Frederick D. Day-Lewis, André Revil
Use of induced polarization to characterize the hydrogeologic framework of the zone of surface‐water/groundwater exchange at the Hanford 300 Area, WA
An extensive continuous waterborne electrical imaging (CWEI) survey was conducted along the Columbia River corridor adjacent to the U.S. Department of Energy (DOE) Hanford 300 Area, WA, in order to improve the conceptual model for exchange between surface water and U‐contaminated groundwater. The primary objective was to determine spatial variability in the depth to the Hanford‐Ringold...
Authors
Lee D. Slater, Dimitrios Ntarlagiannis, Frederick D. Day-Lewis, Kisa Mwakanyamale, John W. Lane, Andy Ward, Roelof J. Versteeg
Origin and extent of fresh paleowaters on the Atlantic continental shelf, USA
While the existence of relatively fresh groundwater sequestered within permeable, porous sediments beneath the Atlantic continental shelf of North and South America has been known for some time, these waters have never been assessed as a potential resource. This fresh water was likely emplaced during Pleistocene sea-level low stands when the shelf was exposed to meteoric recharge and by...
Authors
D. Cohen, M. Person, P. Wang, C.W. Gable, D. R. Hutchinson, A. Marksamer, Brandon Dugan, H. Kooi, K. Groen, D. Lizarralde, R.L. Evans, Frederick D. Day-Lewis, John W. Lane
Science and Products
Filter Total Items: 94
A distribution-based parameterization for improved tomographic imaging of solute plumes
Difference geophysical tomography (e.g. radar, resistivity and seismic) is used increasingly for imaging fluid flow and mass transport associated with natural and engineered hydrologic phenomena, including tracer experiments, in situ remediation and aquifer storage and recovery. Tomographic data are collected over time, inverted and differenced against a background image to produce...
Authors
Adam Pidlisecky, K. Singha, Frederick D. Day-Lewis
Use of electrical imaging and distributed temperature sensing methods to characterize surface water–groundwater exchange regulating uranium transport at the Hanford 300 Area, Washington
We explored the use of continuous waterborne electrical imaging (CWEI), in conjunction with fiber‐optic distributed temperature sensor (FO‐DTS) monitoring, to improve the conceptual model for uranium transport within the Columbia River corridor at the Hanford 300 Area, Washington. We first inverted resistivity and induced polarization CWEI data sets for distributions of electrical...
Authors
Lee D. Slater, Dimitrios Ntarlagiannis, Frederick D. Day-Lewis, Kisa Mwakanyamale, Roelof J. Versteeg, Andy Ward, Christopher Strickland, Carole D. Johnson, John Lane
Marine electrical resistivity imaging of submarine groundwater discharge: Sensitivity analysis and application in Waquoit Bay, Massachusetts, USA
Electrical resistivity imaging has been used in coastal settings to characterize fresh submarine groundwater discharge and the position of the freshwater/salt-water interface because of the relation of bulk electrical conductivity to pore-fluid conductivity, which in turn is a function of salinity. Interpretation of tomograms for hydrologic processes is complicated by inversion artifacts...
Authors
Rory Henderson, Frederick D. Day-Lewis, Elena Abarca, Charles F. Harvey, Hanan N. Karam, Lanbo Liu, John Lane
Improved hydrogeophysical characterization and monitoring through parallel modeling and inversion of time-domain resistivity andinduced-polarization data
Electrical geophysical methods have found wide use in the growing discipline of hydrogeophysics for characterizing the electrical properties of the subsurface and for monitoring subsurface processes in terms of the spatiotemporal changes in subsurface conductivity, chargeability, and source currents they govern. Presently, multichannel and multielectrode data collections systems can...
Authors
Timothy C. Johnson, Roelof J. Versteeg, Andy Ward, Frederick D. Day-Lewis, André Revil
Use of induced polarization to characterize the hydrogeologic framework of the zone of surface‐water/groundwater exchange at the Hanford 300 Area, WA
An extensive continuous waterborne electrical imaging (CWEI) survey was conducted along the Columbia River corridor adjacent to the U.S. Department of Energy (DOE) Hanford 300 Area, WA, in order to improve the conceptual model for exchange between surface water and U‐contaminated groundwater. The primary objective was to determine spatial variability in the depth to the Hanford‐Ringold...
Authors
Lee D. Slater, Dimitrios Ntarlagiannis, Frederick D. Day-Lewis, Kisa Mwakanyamale, John W. Lane, Andy Ward, Roelof J. Versteeg
Origin and extent of fresh paleowaters on the Atlantic continental shelf, USA
While the existence of relatively fresh groundwater sequestered within permeable, porous sediments beneath the Atlantic continental shelf of North and South America has been known for some time, these waters have never been assessed as a potential resource. This fresh water was likely emplaced during Pleistocene sea-level low stands when the shelf was exposed to meteoric recharge and by...
Authors
D. Cohen, M. Person, P. Wang, C.W. Gable, D. R. Hutchinson, A. Marksamer, Brandon Dugan, H. Kooi, K. Groen, D. Lizarralde, R.L. Evans, Frederick D. Day-Lewis, John W. Lane