Frederick D. Day-Lewis (Former Employee)
Science and Products
Filter Total Items: 13
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Filter Total Items: 94
Spatially variable stage-driven groundwater-surface water interaction inferred from time-frequency analysis of distributed temperature sensing data Spatially variable stage-driven groundwater-surface water interaction inferred from time-frequency analysis of distributed temperature sensing data
Characterization of groundwater-surface water exchange is essential for improving understanding of contaminant transport between aquifers and rivers. Fiber-optic distributed temperature sensing (FODTS) provides rich spatiotemporal datasets for quantitative and qualitative analysis of groundwater-surface water exchange. We demonstrate how time-frequency analysis of FODTS and synchronous...
Authors
Kisa Mwakanyamale, Lee Slater, Frederick D. Day-Lewis, Mehrez Elwaseif, Carole D. Johnson
Advancing electrical geophysical characterization of DNAPL-contaminated fractured rock aquifers Advancing electrical geophysical characterization of DNAPL-contaminated fractured rock aquifers
No abstract available.
Authors
Judith Robinson, Timothy Johnosn, Lee Slater, Dimitrios Ntarlagiannis, Pierre Lacombe, Frederick D. Day-Lewis, John W. Lane, Carole D. Johnson, Allen M. Shapiro, Claire R. Tiedeman, Daniel J. Goode
Quantifying solute transport processes: Are chemically "conservative" tracers electrically conservative? Quantifying solute transport processes: Are chemically "conservative" tracers electrically conservative?
The concept of a nonreactive or conservative tracer, commonly invoked in investigations of solute transport, requires additional study in the context of electrical geophysical monitoring. Tracers that are commonly considered conservative may undergo reactive processes, such as ion exchange, thus changing the aqueous composition of the system. As a result, the measured electrical...
Authors
Kamini Singha, Li Li, Frederick D. Day-Lewis, Aaron B. Regberg
Inversion of multi-frequency electromagnetic induction data for 3D characterization of hydraulic conductivity Inversion of multi-frequency electromagnetic induction data for 3D characterization of hydraulic conductivity
Electromagnetic induction (EMI) instruments provide rapid, noninvasive, and spatially dense data for characterization of soil and groundwater properties. Data from multi-frequency EMI tools can be inverted to provide quantitative electrical conductivity estimates as a function of depth. In this study, multi-frequency EMI data collected across an abandoned uranium mill site near Naturita...
Authors
Troy R. Brosten, Frederick D. Day-Lewis, Gregory M. Schultz, Gary P. Curtis, John W. Lane
Assessing field-scale biogeophysical signatures of bioremediation over a mature crude oil spill Assessing field-scale biogeophysical signatures of bioremediation over a mature crude oil spill
We conducted electrical geophysical measurements at the National Crude Oil Spill Fate and Natural Attenuation Research Site (Bemidji, MN). Borehole and surface self-potential measurements do not show evidence for the existence of a biogeobattery mechanism in response to the redox gradient resulting from biodegradation of oil. The relatively small self potentials recorded are instead...
Authors
Lee Slater, Dimitrios Ntarlagiannis, Estella Atekwana, Farag Mewafy, Andre Revil, Magnus Skold, Yuri Gorby, Frederick D. Day-Lewis, John W. Lane, Dale D. Werkema, Jared J. Trost, Geoffrey N. Delin, William N. Herkelrath
A computer program for flow-log analysis of single holes (FLASH) A computer program for flow-log analysis of single holes (FLASH)
A new computer program, FLASH (Flow-Log Analysis of Single Holes), is presented for the analysis of borehole vertical flow logs. The code is based on an analytical solution for steady-state multilayer radial flow to a borehole. The code includes options for (1) discrete fractures and (2) multilayer aquifers. Given vertical flow profiles collected under both ambient and stressed (pumping...
Authors
F. D. Day-Lewis, C. D. Johnson, Frederick L. Paillet, K. J. Halford
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 94
Spatially variable stage-driven groundwater-surface water interaction inferred from time-frequency analysis of distributed temperature sensing data Spatially variable stage-driven groundwater-surface water interaction inferred from time-frequency analysis of distributed temperature sensing data
Characterization of groundwater-surface water exchange is essential for improving understanding of contaminant transport between aquifers and rivers. Fiber-optic distributed temperature sensing (FODTS) provides rich spatiotemporal datasets for quantitative and qualitative analysis of groundwater-surface water exchange. We demonstrate how time-frequency analysis of FODTS and synchronous...
Authors
Kisa Mwakanyamale, Lee Slater, Frederick D. Day-Lewis, Mehrez Elwaseif, Carole D. Johnson
Advancing electrical geophysical characterization of DNAPL-contaminated fractured rock aquifers Advancing electrical geophysical characterization of DNAPL-contaminated fractured rock aquifers
No abstract available.
Authors
Judith Robinson, Timothy Johnosn, Lee Slater, Dimitrios Ntarlagiannis, Pierre Lacombe, Frederick D. Day-Lewis, John W. Lane, Carole D. Johnson, Allen M. Shapiro, Claire R. Tiedeman, Daniel J. Goode
Quantifying solute transport processes: Are chemically "conservative" tracers electrically conservative? Quantifying solute transport processes: Are chemically "conservative" tracers electrically conservative?
The concept of a nonreactive or conservative tracer, commonly invoked in investigations of solute transport, requires additional study in the context of electrical geophysical monitoring. Tracers that are commonly considered conservative may undergo reactive processes, such as ion exchange, thus changing the aqueous composition of the system. As a result, the measured electrical...
Authors
Kamini Singha, Li Li, Frederick D. Day-Lewis, Aaron B. Regberg
Inversion of multi-frequency electromagnetic induction data for 3D characterization of hydraulic conductivity Inversion of multi-frequency electromagnetic induction data for 3D characterization of hydraulic conductivity
Electromagnetic induction (EMI) instruments provide rapid, noninvasive, and spatially dense data for characterization of soil and groundwater properties. Data from multi-frequency EMI tools can be inverted to provide quantitative electrical conductivity estimates as a function of depth. In this study, multi-frequency EMI data collected across an abandoned uranium mill site near Naturita...
Authors
Troy R. Brosten, Frederick D. Day-Lewis, Gregory M. Schultz, Gary P. Curtis, John W. Lane
Assessing field-scale biogeophysical signatures of bioremediation over a mature crude oil spill Assessing field-scale biogeophysical signatures of bioremediation over a mature crude oil spill
We conducted electrical geophysical measurements at the National Crude Oil Spill Fate and Natural Attenuation Research Site (Bemidji, MN). Borehole and surface self-potential measurements do not show evidence for the existence of a biogeobattery mechanism in response to the redox gradient resulting from biodegradation of oil. The relatively small self potentials recorded are instead...
Authors
Lee Slater, Dimitrios Ntarlagiannis, Estella Atekwana, Farag Mewafy, Andre Revil, Magnus Skold, Yuri Gorby, Frederick D. Day-Lewis, John W. Lane, Dale D. Werkema, Jared J. Trost, Geoffrey N. Delin, William N. Herkelrath
A computer program for flow-log analysis of single holes (FLASH) A computer program for flow-log analysis of single holes (FLASH)
A new computer program, FLASH (Flow-Log Analysis of Single Holes), is presented for the analysis of borehole vertical flow logs. The code is based on an analytical solution for steady-state multilayer radial flow to a borehole. The code includes options for (1) discrete fractures and (2) multilayer aquifers. Given vertical flow profiles collected under both ambient and stressed (pumping...
Authors
F. D. Day-Lewis, C. D. Johnson, Frederick L. Paillet, K. J. Halford