Cian Dawson
Science and Products
Use of discrete-zone monitoring systems for hydraulic characterization of a fractured-rock aquifer at the University of Connecticut Landfill, Storrs, Connecticut, 1999 to 2002
Johnson, Carole D.; Kochiss, Christopher S.; Dawson, C.B.
An integrated surface-geophysical investigation of the University of Connecticut landfill, Storrs, Connecticut, 2000
A surface-geophysical investigation to characterize the hydrogeology and contaminant distribution of the former landfill area at the University of Connecticut in Storrs, Connecticut, was conducted in 2000 to supplement the preliminary hydrogeologic assessment of the contamination of soil, surface water, and ground water at the site. A geophysical-...
Johnson, Carole D.; Dawson, C.B.; Belaval, Marcel; Lane, John W.
This video provides an overvew of the USGS Scenario Evaluator for Electrical Resistivity (SEER).
Today’s environmental site managers have many tools to choose from when conducting site characterization and remediation. Geophysical tools can provide noninvasive ways to see inside the earth, much like how medical imaging lets us see inside the human body. The USGS Scenario Evaluator for Electrical Resistivity (or "SEER") is a quick and simple tool practitioners can use to assess the likely outcome of using two-dimensional electrical resistivity imaging for site characterization and remediation monitoring. Electrical resistivity imaging is a widely used geophysical method for environmental site management studies. The method is sensitive to fluid conductivity, interconnected porosity, saturation, clay content, and metallic materials.
Development of the tool was supported by the Environmental Security Technology Certification Program, the U.S. Environmental Protection Agency, and the USGS:
Terry, N.C., Day-Lewis, F.D., Robinson, J.L., Slater, L.D., Halford, Keith, Binley, Andrew, Lane, J.W., and Werkema, Dale, 2017, Scenario Evaluator for Electrical Resistivity Survey Pre-modeling Tool: Groundwater, http://dx.doi.org/10.1111/gwat.12522.
Terry, N.C., Day-Lewis, F.D., Robinson, J.L., Slater, L.D., Halford, Keith, Binley, A., Lane, J.W. Jr., and Werkema, Dale, 2017, The Scenario Evaluator for Electrical Resistivity (SEER) Survey Design Tool v1.0: U.S. Geological Survey Software Release, 01 May 2017, https://doi.org/10.5066/F7028PQ1.
Borehole nuclear magnetic resonance (NMR) is an emerging geophysical method being applied to hydrogeology investigations. NMR is a quantitative geophysical method that can be used to make in situ assessments of porosity, water content, mobile and immobile water fraction, and estimates of permeability. While borehole NMR is commonly used in the oil and gas industry, it is only recently that NMR tools have been designed for use in small-diameter boreholes that are typically used in groundwater studies. This video presents an overview of borehole NMR and example applications for environmental site management.
https://doi.org/10.5066/F73J3BW0
Development of this video was supported by the Environmental Security Technology Certification Program (Project #ER-201567-T2) and the U.S. Geological Survey.
Imagery:
- U.S. Geological Survey
- Department of Earth and Environmental Sciences, Rutgers University Newark
- Medical MRI image courtesy of U.S. Department of Health and Human Services, National Institutes of Health
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
This video provides an overview of the USGS Fractured Rock Geophysical Toolbox Method Selection Tool. The Fractured Rock Geophysical Toolbox Method Selection Tool (FRGT-MST) is an Excel-based tool for identification of geophysical methods most likely to be appropriate for project goals and site conditions. We envision the FRGT-MST: 1) equipping remediation professionals with a tool to understand what is likely to be realistic and cost effective when contracting geophysical services, and 2) reducing applications of geophysics with unrealistic objectives or where methods are likely to fail. The 'toolbox' comprises 30 surface, cross-hole, and borehole geophysical methods. Additionally, hydrologic tests appropriate to fractured rock are included. The user enters information in two tables for site parameters and project goals. Based on user entry, a third table is populated with indicators for which methods support specified goals and are feasible at the site. Worksheet appendices provide detailed information on various methods. The toolbox and additional information are available from the USGS website, http://water.usgs.gov/ogw/bgas/frgt/
Additional Credits:
Written and Produced by C.B. Dawson and F.D. Day-Lewis, U.S. Geological Survey Office of Groundwater, Branch of Geophysics. Development of the tool was supported by the Environmental Security Technology Certification Program, the U.S. Environmental Protection Agency, and the USGS.
USGS Geophysical Field Experience 2015 - Learn about recent hands-on hydrogeophysics field training for USGS interns and scientists.