Office of Research and Development Publications

National Exposure Research Laboratory (NERL) Research Publications

See all EPA publications for Douglas Werkema Include records from any date Include records from any EPA source

Records 1 to 14 of 14 records from [ORD-NERL] published between 11/23/2012 and 11/23/2017 from author Douglas Werkema

2017

Abdel Aal, G., E. Atekwana, AND D Werkema. Complex conductivity response to silver nanoparticles in partially saturated sand columns. JOURNAL OF APPLIED GEOPHYSICS. Elsevier Science Ltd, New York, NY, 137:73-81, (2017).

Sharma, S., L. Slater, D. Ntarlagiannis, D Werkema, AND Z. Szabo. Specific polarizability of sand–clay mixtures with varying ethanol concentration. Near Surface Geophysics. John Wiley & Sons, Inc., Hoboken, NJ, 15(6):615-624, (2017). https://doi.org/10.3997/1873-0604.2017049

2016

Briggs, M., S. Buckley, A. Bagtzoglou, D Werkema, AND J. Lane. Actively Heated High-Resolution Fiber-Optic Distributed Temperature Sensing to Quantify Flow Dynamics in Zones of Strong Groundwater Upwelling. WATER RESOURCES RESEARCH. American Geophysical Union, Washington, DC, 52(7):5179-5194, (2016).

Werkema, D. Geophysical detection methods/GTDSS. Sustainable and Healthy Communities BOSC Subcommittee, OH, Cincinnati, November 02 - 04, 2016.

Briggs, M., J. Lane, F. Day-Lewis, C. Snyder, S. Hurley, N. Hitt, E. White, Z. Johnson, D. Nelms, D Werkema, AND A. Bagtzoglou. Groundwater Flowpath Controls on Seepage Temperature and Future Cold Water Stream Habitat. 2016 Geological Society of America Fall Meeting, Denver, CO, September 25 - 28, 2016.

2015

Karaoulis, M., D Werkema, AND A. Revil. 2D Time-lapse Seismic Tomography Using An Active Time Constraint (ATC) Approach. Journal of Geophysics. Springer, New York, NY, 34(2):206-212, (2015).

Werkema, D, E. Atekwana, AND G. Abdel Aal. Spectral Induced Polarization Measurements of Nanoparticles in Laboratory Column Experiments. Symposium on the application of Geophysics to Environmental and Engineering Problems (SAGEEP), Austin, TX, March 22 - 26, 2015.

2014

Atekwana, E., G. Abdel Aal, AND D Werkema. Detection of Silver Nanoparticles in Vadose Zone Environments using Complex ConductivityMeasurements. Presented at 20th European Meeting of Environmental and Engineering Geophysics, Athens, GREECE, September 14 - 18, 2014.

Heenan, J., D. Ntarlagiannis, L. Slater, J. Nolan, E. Atekwana, C. Ross, E. Atekwana, B. Fathepure, AND D Werkema. Electrical Resistivity Imaging for Long-Term Monitoring of Contaminant Degradation. Presented at 2014 Gulf of Mexico Oil Spill & Ecosystem Science Conference, Mobile, AL, January 28, 2014.

2013

Personna, R., L. Slater, D. Ntarlagiannis, D. Werkema, AND Z. Szabo. Electrical Signatures of Ethanol-Liquid Mixtures: Implications for Monitoring Biofuels Migration in the Subsurface. JOURNAL OF CONTAMINANT HYDROLOGY. Elsevier Science Ltd, New York, NY, 144:99-107, (2013).

Abdel, G., E. Atekwana, AND D Werkema. On the Sensitivity of SIP to the Presence and Transport of Nanoparticles in Saturated Porous Media. Presented at American Geophysical Union Fall Meeting, San Francisco, CA, December 09 - 13, 2013.

Glaser, D., D. Werkema, R. Verstegg, R. Henderson, AND D. Rucker. Temporal GPR Imaging of an Ethanol Release Within a Laboratory-Scaled Sand Tank. JOURNAL OF APPLIED GEOPHYSICS. Elsevier Science Ltd, New York, NY, 86:133-145, (2013).

Karaoulis, M., A. Revil, J. Zhang, AND D. Werkema. Time-Lapse Joint Inversion of Cross-Well DC Resistivity and Seismic Data: A Numerical Investigation. GEOPHYSICS. Society of Exploration Geophysicists, 77(4):141-157, (2013).

2012

Ong, J., D. Werkema, AND J. Lane. Revisiting the Fully Automated Double-Ring Infiltrometer Using Open-Source Electronics. Presented at American Geophysical Union Fall Meeting, San Francisco, CA, December 03 - 07, 2012.