Carole D. Johnson (Former Employee)
Science and Products
Filter Total Items: 18
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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
Flow and sorption controls of groundwater arsenic in individual boreholes from bedrock aquifers in central Maine, USA Flow and sorption controls of groundwater arsenic in individual boreholes from bedrock aquifers in central Maine, USA
To understand the hydrogeochemical processes regulating well water arsenic (As) evolution in fractured bedrock aquifers, three domestic wells with [As] up to 478 μg/L are investigated in central Maine. Geophysical logging reveals that fractures near the borehole bottom contribute 70-100% of flow. Borehole and fracture water samples from various depths show significant proportions of As...
Authors
Qiang Yang, Charles W. Culbertson, Martha G. Nielsen, Charles W. Schalk, Carole D. Johnson, Robert G. Marvinney, Martin Stute, Yan Zheng
A small-diameter NMR logging tool for groundwater investigations A small-diameter NMR logging tool for groundwater investigations
A small-diameter nuclear magnetic resonance (NMR) logging tool has been developed and field tested at various sites in the United States and Australia. A novel design approach has produced relatively inexpensive, small-diameter probes that can be run in open or PVC-cased boreholes as small as 2 inches in diameter. The complete system, including surface electronics and various downhole...
Authors
David Walsh, Peter Turner, Elliot Grunewald, Hong Zhang, James J. Butler, Ed Reboulet, Steve Knobbe, Tom Christy, John W. Lane, Carole D. Johnson, Tim Munday, Andrew Fitzpatrick
Physical, chemical, and isotopic data from groundwater in the watershed of Mirror Lake, and in the vicinity of Hubbard Brook, near West Thornton, New Hampshire, 1983 to 1997 Physical, chemical, and isotopic data from groundwater in the watershed of Mirror Lake, and in the vicinity of Hubbard Brook, near West Thornton, New Hampshire, 1983 to 1997
Research on the hydrogeologic setting of Mirror Lake near West Thornton, New Hampshire (43° 56.5’ N, 71° 41.5’ W), includes the study of the physical, chemical, and isotopic characteristics of groundwater in the vicinity of the lake and nearby Hubbard Brook. Presented here are those physical, chemical, and isotopic data for the period 1983 to 1997. Data were collected from observation...
Authors
James W. LaBaugh, Philip T. Harte, Allen M. Shapiro, Paul A. Hsieh, Carole D. Johnson, Daniel J. Goode, Warren W. Wood, Donald C. Buso, Gene E. Likens, Thomas C. Winter
Well network installation and hydrogeologic data collection, Assateague Island National Seashore, Worcester County, Maryland, 2010 Well network installation and hydrogeologic data collection, Assateague Island National Seashore, Worcester County, Maryland, 2010
The U.S. Geological Survey, as part of its Climate and Land Use Change Research and Development Program, is conducting a multi-year investigation to assess potential impacts on the natural resources of Assateague Island National Seashore, Maryland that may result from changes in the hydrologic system in response to projected sea-level rise. As part of this effort, 26 monitoring wells...
Authors
William S.L. Banks, John P. Masterson, Carole D. Johnson
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
Science and Products
Filter Total Items: 18
No Result Found
Filter Total Items: 52
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
Flow and sorption controls of groundwater arsenic in individual boreholes from bedrock aquifers in central Maine, USA Flow and sorption controls of groundwater arsenic in individual boreholes from bedrock aquifers in central Maine, USA
To understand the hydrogeochemical processes regulating well water arsenic (As) evolution in fractured bedrock aquifers, three domestic wells with [As] up to 478 μg/L are investigated in central Maine. Geophysical logging reveals that fractures near the borehole bottom contribute 70-100% of flow. Borehole and fracture water samples from various depths show significant proportions of As...
Authors
Qiang Yang, Charles W. Culbertson, Martha G. Nielsen, Charles W. Schalk, Carole D. Johnson, Robert G. Marvinney, Martin Stute, Yan Zheng
A small-diameter NMR logging tool for groundwater investigations A small-diameter NMR logging tool for groundwater investigations
A small-diameter nuclear magnetic resonance (NMR) logging tool has been developed and field tested at various sites in the United States and Australia. A novel design approach has produced relatively inexpensive, small-diameter probes that can be run in open or PVC-cased boreholes as small as 2 inches in diameter. The complete system, including surface electronics and various downhole...
Authors
David Walsh, Peter Turner, Elliot Grunewald, Hong Zhang, James J. Butler, Ed Reboulet, Steve Knobbe, Tom Christy, John W. Lane, Carole D. Johnson, Tim Munday, Andrew Fitzpatrick
Physical, chemical, and isotopic data from groundwater in the watershed of Mirror Lake, and in the vicinity of Hubbard Brook, near West Thornton, New Hampshire, 1983 to 1997 Physical, chemical, and isotopic data from groundwater in the watershed of Mirror Lake, and in the vicinity of Hubbard Brook, near West Thornton, New Hampshire, 1983 to 1997
Research on the hydrogeologic setting of Mirror Lake near West Thornton, New Hampshire (43° 56.5’ N, 71° 41.5’ W), includes the study of the physical, chemical, and isotopic characteristics of groundwater in the vicinity of the lake and nearby Hubbard Brook. Presented here are those physical, chemical, and isotopic data for the period 1983 to 1997. Data were collected from observation...
Authors
James W. LaBaugh, Philip T. Harte, Allen M. Shapiro, Paul A. Hsieh, Carole D. Johnson, Daniel J. Goode, Warren W. Wood, Donald C. Buso, Gene E. Likens, Thomas C. Winter
Well network installation and hydrogeologic data collection, Assateague Island National Seashore, Worcester County, Maryland, 2010 Well network installation and hydrogeologic data collection, Assateague Island National Seashore, Worcester County, Maryland, 2010
The U.S. Geological Survey, as part of its Climate and Land Use Change Research and Development Program, is conducting a multi-year investigation to assess potential impacts on the natural resources of Assateague Island National Seashore, Maryland that may result from changes in the hydrologic system in response to projected sea-level rise. As part of this effort, 26 monitoring wells...
Authors
William S.L. Banks, John P. Masterson, Carole D. Johnson
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