Frederick D. Day-Lewis (Former Employee)
Science and Products
Filter Total Items: 13
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Application of frequency- and time-domain electromagnetic surveys to characterize hydrostratigraphy and landfill construction at the Amargosa Desert Research Site, Beatty, Nevada 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...
Authors
Eric A. White, Frederick D. Day-Lewis, Carole D. Johnson, John W. Lane
A fractured rock geophysical toolbox method selection tool 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...
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 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...
Authors
Gary P. Curtis, Matthias Kohler, Ramakrishnan Kannappan, Martin A. Briggs, Frederick D. Day-Lewis
Time-lapse electrical geophysical monitoring of amendment-based biostimulation 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...
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 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...
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 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...
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
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 94
Application of frequency- and time-domain electromagnetic surveys to characterize hydrostratigraphy and landfill construction at the Amargosa Desert Research Site, Beatty, Nevada 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...
Authors
Eric A. White, Frederick D. Day-Lewis, Carole D. Johnson, John W. Lane
A fractured rock geophysical toolbox method selection tool 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...
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 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...
Authors
Gary P. Curtis, Matthias Kohler, Ramakrishnan Kannappan, Martin A. Briggs, Frederick D. Day-Lewis
Time-lapse electrical geophysical monitoring of amendment-based biostimulation 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...
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 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...
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 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...
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