Katherine is interested in non-invasive near surface geophysics and it's applications to hydrology. She has mostly worked with electromagnetic methods including ground penetrating radar (GPR), time domain electromagnetics (TDEM), transient electromagnetic methods (TEM), and nuclear magnetic resonance (NMR). Currently, Katherine’s research involves the determination of how to best to estimate permeability from NMR data in unconsolidated materials. Her research evaluates the use of the two standard empirical equations for estimating permeability using measurements of logging, surface and laboratory NMR data collected from samples from the High Plains aquifer. This research is funded through the NSF GOALI program (Grand Opportunities for Academic Liaison with Industry) and is a collaboration with the USGS, Schlumberger Water Services and Vista Clara, Inc. Katherine research also examines the fundamental mechanisms controlling NMR relaxation in near surface unconsolidated materials and the impact on the interpretation for permeability estimates. She will investigate the effects of larger pores, typically found in unconsolidated materials, on the relationship between the measured NMR data and actual petrophysical properties through numerical simulations and from constructed lab samples. The completion of this research will result in a more comprehensive understanding of NMR relaxation and permeability estimates for groundwater applications.
- 2012 | GP 190, Near-surface geophysics
- 2011 | GP 190/284, Near-surface geophysics/hydrogeophysics
- 2007 | B.S. Geophysics, , University of Texas at Austin
- 2008 – Present | Research Assistant, Stanford University
- 2008 | Geophysical Field Assistant, United States Geological Survey
- 2007 | NSF-Funded Research Experience for Undergraduates (REU), Summer of Applied Geophysical Experience (SAGE)
- 2005 – 2007 | Undergraduate Research Assistant, The Institue for Geophysics, The Univerity of Texas at Austin
Honors & Awards
- 2008 – Present | Stanford Graduate Fellowship
- 2009, 2010 | Shell Travel Grant
- 2007 | College Valedictorian with Top Honors
- 2007 | Distinguished College Scholar
- 2007 | Jackson School of Geophyiscs Research Grant, The University of Texas at Austin
- 2007 | The University of Texas, Co-op Research Grant
- 2007 | Dean Barron Jackson School Scholarship
- 2007 | Geological Society of America Travel Grant
- 2005 – 2007 | Thomas R. Banks Memorial Scholarship
- 2010 - 2011 | Vice President, Society of Exploration Geophysicists, Stanford University Student Chapter
- 2008 – Present | Member, Society of Exploration Geophysicists
- 2008 – Present | Member, American Geophysical Union
- 2011, 2012 | Teaching Assistant, Near-surface geophysics
- 2013 | Parsekian, A.D., Dlubac, K.I., Grunewald, E., Butler, J.J., Knight, R.J. and D.O Walsh (in revisions) Bootstrap calibration of downhole nuclear magnetic resonance hydraulic conductivity estimates in an unconsolidated aquifer.
- 2013 | Dlubac, K.I., R.J. Knight, K. Keating (accepted June 2013) A numerical study of the relationship between NMR relaxation and permeability in materials sands and gravels, Near Surface Geophysics, Magnetic Resonance in the Subsurface Special Issue
- 2013 | Dlubac, K.I., R.J. Knight, Y.Q. Song, N. Bachman, B. Grau, J.C. Cannia, J. Williams, The use of NMR logging to obtain hydraulic conductivity estimates in the High Plains aquifer, Nebraska, USA, Water Resources Research, 49, 1-16.
- 2012 | Knight, R., E. Grunewald, T. Irons, K. Dlubac, Y.Q. Song, H.N. Bachman, B. Grau, D. Walsh, J.D. Abraham, and J. Cannia, Field experiment provides ground truth for surface nuclear magnetic resonance measurement, Geophysical Research Letters, doi: 10.1029/2011GL050167.
- 2010 | Dlubac, K.I. and R.J. Knight, An assessment of the use of the Kozeny-Carman equation to estimate permeability in anisotropic materials from NMR data, SEG Expanded Abstracts 29, 2644-2648, doi:10.1190/1.3513390.
- 2007 | Dlubac, K.I., Salinity and porosity analysis of a New Mexico aquifer using Transient Electro-Magnetic Methods, Near-Surface Geophysics Section Newsletter, SEG, Vol. 14, No. 4.
- Conference Presentations
- 2013 | Dlubac, K.I., and R. Knight, High resolution estimates of hydraulic conductivity from NMR logging data for environmental applications, paper presented at 29th Biennial Groundwater Conference & Groundwater Resources Association of California 22nd Annual Meeting, Sacramento, CA, October 8-9.
- 2012 | Dlubac, K.I., R.J. Knight, A numerical study of the relationship between NMR relaxation and permeability in materials with large pores, presented at Magnetic Resonance in the Subsurface, Hannover, Germany, 25 – 27 September
- 2011 | Dlubac, K.I., R.J. Knight, Y.Q. Song, N. Bachman, B. Grau, J.C. Cannia, J. Williams, Obtaining permeability estimates from NMR logging data in an unconsolidated groundwater aquifer, presented at 2011 Fall Meeting, AGU, San Francisco, Calif., 5-9 Dec.
- 2011 | Knight, R. J., B. Grau, N. Bachman, K.I. Dlubac, Y.Q. Song, G. Steele, J. Williams, E. G. Grunewald, Nuclear Magnetic Resonance Logging to Estimate Permeability in the High Plains Aquifer, Conference Proceedings from Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP), April 2011, Charleston, SC, Abstract # 277.
- 2010 | Knight, R. J., J.D. Abraham, J. Cannia, K.I. Dlubac, B. Grau, E.D. Grunewald, T. Irons, Y.Q. Song, D. Walsh, Field Experiment Provides Ground Truth for Surface NMR Measurement. Eos Trans. AGU, 91(26), Fall Meet. Suppl., Abstract #NS22A-08
- 2007 | Bowling, T., Dlubac, K., Feigelson, L., Fisher, J., Habers, S., Rust, G., Woodsworth, J., Jiracek, G., and Pellerin, L., Hydrological Investigations of the Santo Domingo Basin, New Mexico Using Electromagnetic Soundings, Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract GP32A-08.
- 2007 | Dlubac, K. I., Holt, J., Peters, M., and Lee, K., A Ground-Penetrating Radar Survey of Recharge Features Over Flint Ridge Cave, Austin, Texas, Geological Society of America 41st Annual Meeting: South-Central and North-Central Sections, Poster Session, Lawrence, Kansas.