Frederick D. Day-Lewis (Former Employee)
Science and Products
Filter Total Items: 13
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Advances in interpretation of subsurface processes with time-lapse electrical imaging 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...
Authors
Kaminit Singha, Frederick D. Day-Lewis, Tim B. Johnson, Lee D. Slater
Development of a new semi-analytical model for cross-borehole flow experiments in fractured media Development of a new semi-analytical model for cross-borehole flow experiments in fractured media
Analysis of borehole flow logs is a valuable technique for identifying the presence of fractures in the subsurface and estimating properties such as fracture connectivity, transmissivity and storativity. However, such estimation requires the development of analytical and/or numerical modeling tools that are well adapted to the complexity of the problem. In this paper, we present a new...
Authors
Delphine Roubinet, James Irving, Frederick D. Day-Lewis
Anomalous solute transport in saturated porous media: Relating transport model parameters to electrical and nuclear magnetic resonance properties Anomalous solute transport in saturated porous media: Relating transport model parameters to electrical and nuclear magnetic resonance properties
The advection-dispersion equation (ADE) fails to describe commonly observed non-Fickian solute transport in saturated porous media, necessitating the use of other models such as the dual-domain mass-transfer (DDMT) model. DDMT model parameters are commonly calibrated via curve fitting, providing little insight into the relation between effective parameters and physical properties of the...
Authors
Ryan D Swanson, Andrew Binley, Kristina Keating, Samantha France, Gordon Osterman, Frederick D. Day-Lewis, Kamini Singha
Dual-domain mass-transfer parameters from electrical hysteresis: Theory and analytical approach applied to laboratory, synthetic streambed, and groundwater experiments Dual-domain mass-transfer parameters from electrical hysteresis: Theory and analytical approach applied to laboratory, synthetic streambed, and groundwater experiments
Models of dual‐domain mass transfer (DDMT) are used to explain anomalous aquifer transport behavior such as the slow release of contamination and solute tracer tailing. Traditional tracer experiments to characterize DDMT are performed at the flow path scale (meters), which inherently incorporates heterogeneous exchange processes; hence, estimated “effective” parameters are sensitive to
Authors
Martin A. Briggs, Frederick D. Day-Lewis, John B. Ong, Judson W. Harvey, John W. Lane
1DTempPro: analyzing temperature profiles for groundwater/surface-water exchange 1DTempPro: analyzing temperature profiles for groundwater/surface-water exchange
A new computer program, 1DTempPro, is presented for the analysis of vertical one-dimensional (1D) temperature profiles under saturated flow conditions. 1DTempPro is a graphical user interface to the U.S. Geological Survey code Variably Saturated 2-Dimensional Heat Transport (VS2DH), which numerically solves the flow and heat-transport equations. Pre- and postprocessor features allow the...
Authors
Emily B. Voytek, Anja Drenkelfuss, Frederick D. Day-Lewis, Richard Healy, John W. Lane, Dale D. Werkema
New permafrost is forming around shrinking Arctic lakes, but will it last? New permafrost is forming around shrinking Arctic lakes, but will it last?
Widespread lake shrinkage in cold regions has been linked to climate warming and permafrost thaw. Permafrost aggradation, however, has been observed within the margins of recently receded lakes, in seeming contradiction of climate warming. Here permafrost aggradation dynamics are examined at Twelvemile Lake, a retreating lake in interior Alaska. Observations reveal patches of recently...
Authors
Martin A. Briggs, Michelle Ann Walvoord, Jeffrey M. McKenzie, Clifford I. Voss, Frederick D. Day-Lewis, John W. Lane
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 94
Advances in interpretation of subsurface processes with time-lapse electrical imaging 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...
Authors
Kaminit Singha, Frederick D. Day-Lewis, Tim B. Johnson, Lee D. Slater
Development of a new semi-analytical model for cross-borehole flow experiments in fractured media Development of a new semi-analytical model for cross-borehole flow experiments in fractured media
Analysis of borehole flow logs is a valuable technique for identifying the presence of fractures in the subsurface and estimating properties such as fracture connectivity, transmissivity and storativity. However, such estimation requires the development of analytical and/or numerical modeling tools that are well adapted to the complexity of the problem. In this paper, we present a new...
Authors
Delphine Roubinet, James Irving, Frederick D. Day-Lewis
Anomalous solute transport in saturated porous media: Relating transport model parameters to electrical and nuclear magnetic resonance properties Anomalous solute transport in saturated porous media: Relating transport model parameters to electrical and nuclear magnetic resonance properties
The advection-dispersion equation (ADE) fails to describe commonly observed non-Fickian solute transport in saturated porous media, necessitating the use of other models such as the dual-domain mass-transfer (DDMT) model. DDMT model parameters are commonly calibrated via curve fitting, providing little insight into the relation between effective parameters and physical properties of the...
Authors
Ryan D Swanson, Andrew Binley, Kristina Keating, Samantha France, Gordon Osterman, Frederick D. Day-Lewis, Kamini Singha
Dual-domain mass-transfer parameters from electrical hysteresis: Theory and analytical approach applied to laboratory, synthetic streambed, and groundwater experiments Dual-domain mass-transfer parameters from electrical hysteresis: Theory and analytical approach applied to laboratory, synthetic streambed, and groundwater experiments
Models of dual‐domain mass transfer (DDMT) are used to explain anomalous aquifer transport behavior such as the slow release of contamination and solute tracer tailing. Traditional tracer experiments to characterize DDMT are performed at the flow path scale (meters), which inherently incorporates heterogeneous exchange processes; hence, estimated “effective” parameters are sensitive to
Authors
Martin A. Briggs, Frederick D. Day-Lewis, John B. Ong, Judson W. Harvey, John W. Lane
1DTempPro: analyzing temperature profiles for groundwater/surface-water exchange 1DTempPro: analyzing temperature profiles for groundwater/surface-water exchange
A new computer program, 1DTempPro, is presented for the analysis of vertical one-dimensional (1D) temperature profiles under saturated flow conditions. 1DTempPro is a graphical user interface to the U.S. Geological Survey code Variably Saturated 2-Dimensional Heat Transport (VS2DH), which numerically solves the flow and heat-transport equations. Pre- and postprocessor features allow the...
Authors
Emily B. Voytek, Anja Drenkelfuss, Frederick D. Day-Lewis, Richard Healy, John W. Lane, Dale D. Werkema
New permafrost is forming around shrinking Arctic lakes, but will it last? New permafrost is forming around shrinking Arctic lakes, but will it last?
Widespread lake shrinkage in cold regions has been linked to climate warming and permafrost thaw. Permafrost aggradation, however, has been observed within the margins of recently receded lakes, in seeming contradiction of climate warming. Here permafrost aggradation dynamics are examined at Twelvemile Lake, a retreating lake in interior Alaska. Observations reveal patches of recently...
Authors
Martin A. Briggs, Michelle Ann Walvoord, Jeffrey M. McKenzie, Clifford I. Voss, Frederick D. Day-Lewis, John W. Lane