Frederick D. Day-Lewis (Former Employee)
Science and Products
Filter Total Items: 93
Simulation of less‐mobile porosity dynamics in contrasting sediment water interface porous media
Considering heterogeneity in porous media pore size and connectivity is essential to predicting reactive solute transport across interfaces. However, exchange with less‐mobile porosity is rarely considered in surface water/groundwater recharge studies. Previous research indicates that a combination of pore‐fluid sampling and geoelectrical measurements can be used to quantify less‐mobile porosity e
Authors
Farzaneh MahmoodPoor Dehkordy, Martin A. Briggs, Frederick D. Day-Lewis, Amvrossios C. Bagtzoglou
MoisturEC: a new R program for moisture content estimation from electrical conductivity data
Noninvasive geophysical estimation of soil moisture has potential to improve understanding of flow in the unsaturated zone for problems involving agricultural management, aquifer recharge, and optimization of landfill design and operations. In principle, several geophysical techniques (e.g., electrical resistivity, electromagnetic induction, and nuclear magnetic resonance) offer insight into soil
Authors
Neil Terry, Frederick D. Day-Lewis, Dale D. Werkema, John W. Lane
Scenario Evaluator for Electrical Resistivity survey pre-modeling tool
Geophysical tools have much to offer users in environmental, water resource, and geotechnical fields; however, techniques such as electrical resistivity imaging (ERI) are often oversold and/or overinterpreted due to a lack of understanding of the limitations of the techniques, such as the appropriate depth intervals or resolution of the methods. The relationship between ERI data and resistivity is
Authors
Neil Terry, Frederick D. Day-Lewis, Judith L. Robinson, Lee D. Slater, Keith J. Halford, Andrew Binley, John W. Lane, Dale D. Werkema
Pore network modeling of the electrical signature of solute transport in dual-domain media
Dual-domain models are used to explain anomalous solute transport behavior observed in diverse hydrologic settings and applications, from groundwater remediation to hyporheic exchange. To constrain such models, new methods are needed with sensitivity to both immobile and mobile domains. Recent experiments indicate that dual-domain transport of ionic tracers has an observable geoelectrical signatur
Authors
Frederick Day-Lewis, Niklas Linde, Roy Haggerty, Kamini Singha, Martin Briggs
Surface geophysical methods for characterising frozen ground in transitional permafrost landscapes
The distribution of shallow frozen ground is paramount to research in cold regions, and is subject to temporal and spatial changes influenced by climate, landscape disturbance and ecosystem succession. Remote sensing from airborne and satellite platforms is increasing our understanding of landscape-scale permafrost distribution, but typically lacks the resolution to characterise finer-scale proces
Authors
Martin A. Briggs, Seth Campbell, Jay Nolan, Michelle Ann Walvoord, Dimitrios Ntarlagiannis, Frederick D. Day-Lewis, John W. Lane
Application of frequency- and time-domain electromagnetic surveys to characterize hydrostratigraphy and landfill construction at the Amargosa Desert Research Site, Beatty, Nevada
In 2014 and 2015, the U.S. Geological Survey (USGS), conducted frequency-domain electromagnetic (FDEM) surveys at the USGS Amargosa Desert Research Site (ADRS), approximately 17 kilometers (km) south of Beatty, Nevada. The FDEM surveys were conducted within and adjacent to a closed low-level radioactive waste disposal site located at the ADRS. FDEM surveys were conducted on a grid of north-south a
Authors
Eric A. White, Frederick D. Day-Lewis, Carole D. Johnson, John W. Lane
A fractured rock geophysical toolbox method selection tool
Geophysical technologies have the potential to improve site characterization and monitoring in fractured rock, but the appropriate and effective application of geophysics at a particular site strongly depends on project goals (e.g., identifying discrete fractures) and site characteristics (e.g., lithology). No method works at every site or for every goal. New approaches are needed to identify a se
Authors
F. D. Day-Lewis, C. D. Johnson, L.D. Slater, J.L. Robinson, J.H. Williams, C.L. Boyden, D.D. Werkema, J. W. Lane
Upscaling of U (VI) desorption and transport from decimeter‐scale heterogeneity to plume‐scale modeling
Scientifically defensible predictions of field scale U(VI) transport in groundwater requires an understanding of key processes at multiple scales. These scales range from smaller than the sediment grain scale (less than 10 μm) to as large as the field scale which can extend over several kilometers. The key processes that need to be considered include both geochemical reactions in solution and at s
Authors
Gary P. Curtis, Matthias Kohler, Ramakrishnan Kannappan, Martin A. Briggs, Frederick D. Day-Lewis
Time-lapse electrical geophysical monitoring of amendment-based biostimulation
Biostimulation is increasingly used to accelerate microbial remediation of recalcitrant groundwater contaminants. Effective application of biostimulation requires successful emplacement of amendment in the contaminant target zone. Verification of remediation performance requires postemplacement assessment and contaminant monitoring. Sampling-based approaches are expensive and provide low-density s
Authors
Timothy C. Johnson, Roelof J. Versteeg, Frederick D. Day-Lewis, William Major, John W. Lane
1DTempPro V2: new features for inferring groundwater/surface-water exchange
A new version of the computer program 1DTempPro extends the original code to include new capabilities for (1) automated parameter estimation, (2) layer heterogeneity, and (3) time-varying specific discharge. The code serves as an interface to the U.S. Geological Survey model VS2DH and supports analysis of vertical one-dimensional temperature profiles under saturated flow conditions to assess groun
Authors
Franklin W. Koch, Emily B. Voytek, Frederick D. Day-Lewis, Richard W. Healy, Martin A. Briggs, John W. Lane, Dale D. Werkema
Imaging pathways in fractured rock using three-dimensional electrical resistivity tomography
Major challenges exist in delineating bedrock fracture zones because these cause abrupt changes in geological and hydrogeological properties over small distances. Borehole observations cannot sufficiently capture heterogeneity in these systems. Geophysical techniques offer the potential to image properties and processes in between boreholes. We used three-dimensional cross borehole electrical resi
Authors
Judith Robinson, Lee Slater, Timothy B. Johnson, Allen M. Shapiro, Claire R. Tiedeman, Dimitrios Ntlargiannis, Carole D. Johnson, Frederick D. Day-Lewis, Pierre Lacombe, Thomas E. Imbrigiotta, John W. Lane
Advances in interpretation of subsurface processes with time-lapse electrical imaging
Electrical geophysical methods, including electrical resistivity, time-domain induced polarization, and complex resistivity, have become commonly used to image the near subsurface. Here, we outline their utility for time-lapse imaging of hydrological, geochemical, and biogeochemical processes, focusing on new instrumentation, processing, and analysis techniques specific to monitoring. We review da
Authors
Kaminit Singha, Frederick D. Day-Lewis, Tim B. Johnson, Lee D. Slater
Science and Products
Filter Total Items: 93
Simulation of less‐mobile porosity dynamics in contrasting sediment water interface porous media
Considering heterogeneity in porous media pore size and connectivity is essential to predicting reactive solute transport across interfaces. However, exchange with less‐mobile porosity is rarely considered in surface water/groundwater recharge studies. Previous research indicates that a combination of pore‐fluid sampling and geoelectrical measurements can be used to quantify less‐mobile porosity e
Authors
Farzaneh MahmoodPoor Dehkordy, Martin A. Briggs, Frederick D. Day-Lewis, Amvrossios C. Bagtzoglou
MoisturEC: a new R program for moisture content estimation from electrical conductivity data
Noninvasive geophysical estimation of soil moisture has potential to improve understanding of flow in the unsaturated zone for problems involving agricultural management, aquifer recharge, and optimization of landfill design and operations. In principle, several geophysical techniques (e.g., electrical resistivity, electromagnetic induction, and nuclear magnetic resonance) offer insight into soil
Authors
Neil Terry, Frederick D. Day-Lewis, Dale D. Werkema, John W. Lane
Scenario Evaluator for Electrical Resistivity survey pre-modeling tool
Geophysical tools have much to offer users in environmental, water resource, and geotechnical fields; however, techniques such as electrical resistivity imaging (ERI) are often oversold and/or overinterpreted due to a lack of understanding of the limitations of the techniques, such as the appropriate depth intervals or resolution of the methods. The relationship between ERI data and resistivity is
Authors
Neil Terry, Frederick D. Day-Lewis, Judith L. Robinson, Lee D. Slater, Keith J. Halford, Andrew Binley, John W. Lane, Dale D. Werkema
Pore network modeling of the electrical signature of solute transport in dual-domain media
Dual-domain models are used to explain anomalous solute transport behavior observed in diverse hydrologic settings and applications, from groundwater remediation to hyporheic exchange. To constrain such models, new methods are needed with sensitivity to both immobile and mobile domains. Recent experiments indicate that dual-domain transport of ionic tracers has an observable geoelectrical signatur
Authors
Frederick Day-Lewis, Niklas Linde, Roy Haggerty, Kamini Singha, Martin Briggs
Surface geophysical methods for characterising frozen ground in transitional permafrost landscapes
The distribution of shallow frozen ground is paramount to research in cold regions, and is subject to temporal and spatial changes influenced by climate, landscape disturbance and ecosystem succession. Remote sensing from airborne and satellite platforms is increasing our understanding of landscape-scale permafrost distribution, but typically lacks the resolution to characterise finer-scale proces
Authors
Martin A. Briggs, Seth Campbell, Jay Nolan, Michelle Ann Walvoord, Dimitrios Ntarlagiannis, Frederick D. Day-Lewis, John W. Lane
Application of frequency- and time-domain electromagnetic surveys to characterize hydrostratigraphy and landfill construction at the Amargosa Desert Research Site, Beatty, Nevada
In 2014 and 2015, the U.S. Geological Survey (USGS), conducted frequency-domain electromagnetic (FDEM) surveys at the USGS Amargosa Desert Research Site (ADRS), approximately 17 kilometers (km) south of Beatty, Nevada. The FDEM surveys were conducted within and adjacent to a closed low-level radioactive waste disposal site located at the ADRS. FDEM surveys were conducted on a grid of north-south a
Authors
Eric A. White, Frederick D. Day-Lewis, Carole D. Johnson, John W. Lane
A fractured rock geophysical toolbox method selection tool
Geophysical technologies have the potential to improve site characterization and monitoring in fractured rock, but the appropriate and effective application of geophysics at a particular site strongly depends on project goals (e.g., identifying discrete fractures) and site characteristics (e.g., lithology). No method works at every site or for every goal. New approaches are needed to identify a se
Authors
F. D. Day-Lewis, C. D. Johnson, L.D. Slater, J.L. Robinson, J.H. Williams, C.L. Boyden, D.D. Werkema, J. W. Lane
Upscaling of U (VI) desorption and transport from decimeter‐scale heterogeneity to plume‐scale modeling
Scientifically defensible predictions of field scale U(VI) transport in groundwater requires an understanding of key processes at multiple scales. These scales range from smaller than the sediment grain scale (less than 10 μm) to as large as the field scale which can extend over several kilometers. The key processes that need to be considered include both geochemical reactions in solution and at s
Authors
Gary P. Curtis, Matthias Kohler, Ramakrishnan Kannappan, Martin A. Briggs, Frederick D. Day-Lewis
Time-lapse electrical geophysical monitoring of amendment-based biostimulation
Biostimulation is increasingly used to accelerate microbial remediation of recalcitrant groundwater contaminants. Effective application of biostimulation requires successful emplacement of amendment in the contaminant target zone. Verification of remediation performance requires postemplacement assessment and contaminant monitoring. Sampling-based approaches are expensive and provide low-density s
Authors
Timothy C. Johnson, Roelof J. Versteeg, Frederick D. Day-Lewis, William Major, John W. Lane
1DTempPro V2: new features for inferring groundwater/surface-water exchange
A new version of the computer program 1DTempPro extends the original code to include new capabilities for (1) automated parameter estimation, (2) layer heterogeneity, and (3) time-varying specific discharge. The code serves as an interface to the U.S. Geological Survey model VS2DH and supports analysis of vertical one-dimensional temperature profiles under saturated flow conditions to assess groun
Authors
Franklin W. Koch, Emily B. Voytek, Frederick D. Day-Lewis, Richard W. Healy, Martin A. Briggs, John W. Lane, Dale D. Werkema
Imaging pathways in fractured rock using three-dimensional electrical resistivity tomography
Major challenges exist in delineating bedrock fracture zones because these cause abrupt changes in geological and hydrogeological properties over small distances. Borehole observations cannot sufficiently capture heterogeneity in these systems. Geophysical techniques offer the potential to image properties and processes in between boreholes. We used three-dimensional cross borehole electrical resi
Authors
Judith Robinson, Lee Slater, Timothy B. Johnson, Allen M. Shapiro, Claire R. Tiedeman, Dimitrios Ntlargiannis, Carole D. Johnson, Frederick D. Day-Lewis, Pierre Lacombe, Thomas E. Imbrigiotta, John W. Lane
Advances in interpretation of subsurface processes with time-lapse electrical imaging
Electrical geophysical methods, including electrical resistivity, time-domain induced polarization, and complex resistivity, have become commonly used to image the near subsurface. Here, we outline their utility for time-lapse imaging of hydrological, geochemical, and biogeochemical processes, focusing on new instrumentation, processing, and analysis techniques specific to monitoring. We review da
Authors
Kaminit Singha, Frederick D. Day-Lewis, Tim B. Johnson, Lee D. Slater