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Records 1 to 25 of 108 records from author Douglas Werkema

2024
Werkema, D., N. Terry, M. Briggs, B. Trottier, AND E. Rutila. ELECTROMAGNETIC, MAGNETOMETRY, AND THERMAL MAPPING OF GROUNDWATER SEEPS IMPACTED BY MINE INFLUENCED WATER FROM ABANDONED HARDROCK MINES NEAR SILVERTON, CO. Symposium on the Application of Geophysics to Environmental and Engineering Problems, Tucson, AZ, March 24 - 28, 2024.
Falzone, S., C. Schaefer, E. Siegenthaler, K. Keating, D. Werkema, AND L. Slater. Geophysical Signatures of Soil AFFF Contamination from Spectral Induced Polarization and Low Field Nuclear Magnetic Resonance Methods. JOURNAL OF CONTAMINANT HYDROLOGY. Elsevier Science Ltd, New York, NY, 260:104268, (2024). https://doi.org/10.1016/j.jconhyd.2023.104268
Werkema, D., F. Day-Lewis, L. Slater, C. Johnson, N. Terry, AND J. Lane. What's holding geophysics back. Symposium on the Applications of Geophysics to Environmental and Engineering Problems, Tucson, AZ, March 24 - 29, 2024.
2023
Thomle, J., D. Werkema, F. Day-Lewis, P. Jaysaval, AND T Chris Mochon Collura. AN INVESTIGATION OF THE SUBSURFACE FRESHWATER/SALTWATER DISTRIBUTION IN AN ESTUARINE ENVIRONMENT USING TOWED TIME DOMAIN ELECTROMAGNETIC METHODS. Symposium on the Application of Geophysics to Environmental and Engineering Problems, New Orleans, LA, April 03 - 06, 2023.
Werkema, D., N. Terry, AND B. Trottier. BPMD Mayflower Section of the Animas River, Silverton, CO. Geophysical Surveys for Groundwater – Surface Water Characteristics. Bonita Peak Mining District Community Meeting, Silverton, CO, July 11, 2023.
Werkema, D. Environmental Geophysics Overview, Research, and Applications. ROCS-Net PESD meeting, newport, OR, October 04 - 19, 2023.
Werkema, D. Environmental Geophysics: Basic Concepts, Applications, Examples, and Resources. EPA Groundwater Forum meeting, corvallis, OR, July 13, 2023.
Terry, N., F. Day-Lewis, J. Lane, C. Johnson, AND D. Werkema. Field evaluation of semi-automated moisture estimation from geophysics using machine learning. Vadose Zone Journal. Soil Science Society of America, Madison, WI, 22(2):e20246, (2023). https://doi.org/10.1002/vzj2.20246
Werkema, D., S. Falzone, E. Siegenthaler, A. Avelar, D. Ntarlagiannis, K. Keating, L. Slater, AND C. Schaefer. Locating, Identifying, and Characterizing PFAS Impacted Soils in the Field with Spectral Induced Polarization. EPA, State, and Tribal Bimonthly PFAS science call webinar, online, OR, December 11, 2023.
Avelar, A., D. Ntarlagiannis, K. Peshtani, C. Schaefer, D. Werkema, AND L. Slater. Spectral Induced Polarization Signatures of PFAS-contaminated soils. American Geophysical Union, San Francisco, CA, December 11 - 15, 2023.
Werkema, D., F. Day-Lewis, C. Johnson, N. Terry, AND J. Lane. WHAT’S THE PROBLEM WITH GEOPHYSICS? Symposium on the Application of Geophysics to Environmental and Engineering Problems, New Orleans, LA, April 03 - 06, 2023.
2022
McAliley, W., F. Day-Lewis, D. Rey, M. Briggs, A. Shapiro, AND D. Werkema. Application of Recursive Estimation to Heat Tracing for Groundwater/Surface-Water Exchange. WATER RESOURCES RESEARCH. American Geophysical Union, Washington, DC, 58(6):e2021WR030443, (2022). https://doi.org/10.1029/2021WR030443
Glaser, D., R. Henderson, D. Werkema, T. Johnson, AND R. Versteeg. Estimating Biofuel Contaminant Concentration from 4D ERT with Mixing Models. JOURNAL OF CONTAMINANT HYDROLOGY. Elsevier Science Ltd, New York, NY, 248:104027, (2022). https://doi.org/10.1016/j.jconhyd.2022.104027
Trottier, B., R. Versteeg, D. Werkema, A. Meyal, G. Partridge, AND C. Johnson. GEOPHYSICAL ANALYSIS OF PERMEABLE PAVEMENT INFILTRATION DURING SIMULATED RAINFALL EVENTS. Symposium for the Application of Geophysics to Environmental and Engineering Problems (SAGEEP), Denver, CO, March 20 - 24, 2022.
Hammett, S., F. Day-Lewis, B. Trottier, P. Barlow, M. Briggs, G. Delin, J. Harvey, C. Johnson, J. Lane, Jr, D. Rosenberry, AND D. Werkema. GW/SW-MST: A Groundwater/Surface-Water Method Selection Tool. Groundwater. Wiley-Blackwell, Hoboken, NJ, , 13194, (2022). https://doi.org/10.1111/gwat.13194
Werkema, Dale. Geophysics applications to LUST sites: case studies and online tools. 27th National Tanks Conference & Exposition, Pittsburg, PA, September 13 - 15, 2022.
2021
DeWitt, Ted, Cheryl A. Brown, Dale Werkema, C. Hernandez, C. Jackson, S. Pacella, AND M. Harwell. EPA Research to Protect Coastal Ecosystems and Communities. Hatfield Marine Science Center's Marine Science Day 2021, Newport, OR, April 10, 2021.
Falzone, S., E. Siegenthaler, C. Schaefer, K. Keating, Dale Werkema, AND L. Slater. Early Evidence for Complex Resistivity as a Geophysical Field Method to Delineate PFAS Contamination. RemPlex: 2021 Global Summit on Environmental Remediation; Center for the Remediation of Complex Sites (RemPlex), Richmond, Washington, November 08 - 12, 2021.
Terry, N., Dale Werkema, F. Day-Lewis, AND J. Lane Jr. FIELD ASSESSMENT OF FDEM AND GPR TO RESOLVE SOIL MOISTURE VARIATIONS USING MACHINE LEARNING. Symposium on the Application of Geophysics to Environmental and Engineering Problems, Denver, CO, March 10, 2021.
2020
Domanski, M., D. Quinn, F. Day-Lewis, M. Briggs, D Werkema, AND J. Lane Jr. DTSGUI: A Python Program to Process and Visualize Fiber‐Optic Distributed Temperature Sensing Data. Groundwater. Wiley-Blackwell, Hoboken, NJ, 58(5):799-804, (2020). https://doi.org/10.1111/gwat.12974
Terry, N., R. Runkel, Dale Werkema, E. Rutila, X. Comas, M. Warren, A. Kristiyono, AND D. Murdiyarso. Exploring the potential of ground-penetrating radar (GPR) to measure the extent of chronic disturbance in peatlands: examples from acid mine drainage and peat fire. International Conference on Ground Penetrating Radar, Golden, CO, June 14 - 19, 2020. https://doi.org/10.1190/gpr2020-015.1
Werkema, Dale. Forward to the FastTIMES Special Issue on Contaminant Geophysics. FastTIMES. Environmental and Engineering Geophysical Society, Denver, CO, 25(2):30, (2020).
Johnson, C., K. Pappas, E. White, Dale Werkema, N. Terry, R. Ford, S. Phillips, K. Limes, AND J. Lane Jr. Geophysical Assessment of a Proposed Landfill Site in Fredericktown, Missouri. FastTIMES. Environmental and Engineering Geophysical Society, Denver, CO, 25(2):98-106, (2020).
Werkema, Dale. Geophysical tools for on-scene coordinators: practical non-intrusive applications to assess and characterize the subsurface. Region 7 Annual On-Scene Coordinators Training, Lenexa, Kansas, January 13 - 17, 2020.
2019
Sherrod, L., W. Sauck, E. Simpson, D Werkema, AND J. Swiontek. Case Histories of GPR for Animal Burrows Mapping and Geometry. JOURNAL OF ENVIRONMENTAL AND ENGINEERING GEOPHYSICS. Environmental and Engineering Geophysical Society, Denver, CO, 24(1):1-17, (2019).