GREG POHLL

Associate Research Professor

EDUCATION:

Ph.D., Hydrology and Hydrogeology, University of Nevada, Reno
M.S., Hydrology, University of Nevada, Reno
B.S., Mathematics, University of Nevada, Reno

PROFESSIONAL INTERESTS:

Dr. Pohll's major research interest is in numerical simulation of hydrologic systems. Evaluation of complex hydrologic systems requires tools from the traditionally fragmented fields of surface water hydrology, groundwater hydrogeology, and statistics. He is specifically interested in the development and application of numerical models that allow the end users to better understand the system and to make decisions within an uncertain environment. He uses state-of-the-art numerical tools to evaluate the all of the uncertainties inherent in the modeling environment so the end users understand how to quantify the worth of the modeling results in relation to the ramifications of the decision.

RESEARCH AREAS:

Hydrology of the Unsaturated Zone; Contaminant Transport; Hydrogeological Controls on Availability and Quality of Ground Water; Integrated Watershed System

JOURNAL ARTICLES

Botros, F.; Hassan, A.; Reeves, D.M.; Pohll, G.M.; 2008 (inpress).

On mapping fracture networks onto continuum. Water Resources Research.

Carroll, Rosemary W.H.; Pohll, Greg; Hershey, Ronald L.; 2008 (submitted).

A Groundwater Model of the Death Valley Regional Flow System Using MODFLOW-SURFACT. Journal of Hydrology.

Carroll, Rosemary W.H.; Pohll, Greg; Earman, Sam; Hershey, Ronald L.; 2008 (accepted).

A comparison of groundwater fluxes computed with MODFLOW and a mixing model using deuterium: application to the eastern Nevada Test Site and vicinity. Journal of Hydrology.

Carroll, R.W.; Pohll, G.M.; Earman, S.; Hershey, R.L.; 2007.

Global optimization of a deuterium calibrated, discrete-state compartment model (DSCM): Application to the eastern Nevada Test Site. Journal of Hydrology. v.345. pp.237-253.

Lutz, A.; Thomas, J.M.; Pohll, G.M.; Mckay, W.A.; 2007.

Groundwater resource sustainability in the Nabogo Basin of Ghana, West Africa. Journal of African Earth Sciences.

Lundmark, K.; Pohll, G.M.; 2007 (submitted).

Regional Water Budget Uncertainty Analysis Using a Mass Balance Mixing-Cell Model: Eastern Nevada and Western Utah, USA. Journal of Hydrology.

Young, M.H.; Albright, W.H.; Pohlmann, K.F.; Pohll, G.M.; Zachritz, W.H.; Zitzer, S.F.; Shafer, D.S.; Nester, I.; Oyelowo, L.; 2006.

Incorporating parametric uncertainty in the design of alternative landfill covers in arid regions. Vadose Zone Journal. v.5. pp.742-750.

Stevick, E.; Pohll, G.M.; Huntington, J.L.; 2005.

Locating new production wells using a probabilistic-based groundwater model, Journal of Hydrology. Journal of Hydrology. v.303. pp.231-246.

Niswonger, R.G.; Prudic, D.E.; Pohll, G.M.; Constanz, J.; 2005.

Incorporating seepage losses into the unsteady streamflow equations for simulating intermittent flow along mountain front streams. Water Resources Research. v.41.

Carroll, R.W.; Pohll, G.M.; Tracy, J.; Winter, T.; Smith, R.; 2005.

Simulation of a semi-permanent wetland basin in the Cottonwood Lake study area, east-central North Dakota. Journal of Hydrologic Engineering. v.1. s.10. pp.70-84.

Benson, D.A.; Tadjeran, C.; Meerschaert, M.M.; Farnham, I.; Pohll, G.M.; 2004.

Radial fractional-order dispersion through fractured rock. Water Resources Research. v.12. s.40.

Dahan, O.; McGraw, D.; Adara, E.; Pohll, G.; Bohm, B.; Thomas, J.M.; 2004.

Multi-variable mixing cell model as a calibration and validation tool for hydrogeologic groundwater modeling. Journal of Hydrology. v.293. pp.115-136.

Reimus, P.; Pohll, G.M.; Mihevc, T.M.; Chapman, J.B.; Haga, M.; Lyles, B.F.; Kosinski, S.; Niswonger, R.; Sanders, P.; 2003.

Testing and parameterizing a conceptual model for solute transport in a fractured granite using multiple tracers in a forced-gradient test. Water Resources Research. v.12. s.39. pp.1356-1370.

CONFERENCE ABSTRACTS

Reeves, D.M.; Zhang, Y.; Pohll, G.; Benson, D.; 2008.

FRACK: A freeware flow and transport suite for fractured media. MODFLOW and MORE 2008: Ground Water and Public Policy. Golden, CO.

Carroll, Rosemary W.H.; Pohll, Greg; Pohlmann, Karl; Boyle, Doug; Garner, Chris; Knust, Anna; 2008.

Preliminary Model of a Coupled Groundwater-Surface Water System, Mason Valley, Nevada. MODFLOW and More: Ground Water and Public Policy. International Ground Water Modeling Center. Colorado School of Mines, Golden, CO USA.

Ye, M.; Pohlmann, K.F.; Chapman, J.B.; Pohll, G.M.; Reeves, D.M.; 2008.

Assessing recharge and hydrostratigraphic model uncertainty in the Climax Mine area of the Nevada Test Site. MODFLOW and MORE 2008: Ground Water and Public Policy. Golden, CO.

Humphrey, S.; Reeves, D.; Pohll, G.; Oppliger, G.; Huntington, J.; 2008.

A stochastic approach to a groundwater flow model for the southern Honey Lake Valley in Lassen County, California and Washoe County, Nevada. Nevada Water Resources Association Annual Conference. Mesquite, Nevada.

Chapman, Jenny; Pohll, Greg; Hassan, Ahmed; Pohlmann, Karl; 2007.

Using Uncertainty to Guide Characterization, Closure, and Long-term Management of an Underground Nuclear Test Site. International Symposium on Technology and Society: Risk, Uncertainty, Vulnerability. IEEE. Las Vegas, Nevada.

Lutz, A.; Thomas, J.M.; Pohll, G.M.; Keita, M.; Apambire, B.; Mckay, W.A.; 2007.

Ground Water Resource Sustainability in the Bani Area of Mali. Albuquerque, New Mexico.

Carroll, R W H; Pohll, G M; Earman, S; Hershey, R L; 2007.

A comparison of groundwater fluxes computed with MODFLOW and a stable isotope mixing model: Application to the eastern Nevada Test Site and vicinity. American Geophysical Union Fall Meeting. San Francisco.

Chapman, J.B.; Pohll, G.M.; Hassan, A.; Pohlmann, K.F.; 2007.

Using Uncertainty to Guide Characterization, Closure, and Long-term Management of an Underground Nuclear Test Site. Institute of Electrical and Electronics Engineers. June 1-2, 2007, Las Vegas, NV.

Botros, Farag; Hassan, Ahmed; Pohll, Greg; 2007.

Block-effective Dispersivity in Heterogeneous Media: Effects of Porosity and Distribution Coefficient Variability. International Symposium on Technology and Society: Risk, Uncertainty, Vulnerability. IEEE. Las Vegas, Nevada.

Makowski, A.; Pohll, G.; Kropf, C.; 2007.

Modeling Nitrate Transport in Spanish Springs Valley, Washoe County, Nevada. Nitrate Workshop. Nevada Water Resources Association. Carson City, Nevada.

Pohlmann, K.F.; Ye, M.; Pohll, G.M.; Chapman, J.B.; 2007.

Use of Numerical Groundwater Modeling to Evaluate Uncertainty in Conceptual Models of Recharge and Hydrostratigraphy. Institute of Electrical and Electronics Engineers. June 1-2, 2007, Las Vegas, NV.

Makowski, Anna; Pohll, Greg ; Kropf, Christian; 2006.

Modeling nitrate transport in Spanish Springs Valley, Washoe County, Nevada. 2006 General Meeting. Geological Society of America. Philadelphia, PA.

Boyle, D.P.; Lamorey, G.W.; Bassett, S.D.; Pohll, G.M.; Krause, P.; Kralisch, S.; 2006.

Investigating the value of hydrologic model complexity and spatial information using multicriteria methods. IAHS. Nice, France.

Ye, M.; Pohlmann, K.F.; Pohll, G.M.; Chapman, J.B.; 2006.

Assessing Recharge and Geological Model Uncertainty at the Climax Stock of the Death Valley Regional Flow System. American Geophysical Union. San Francisco, California.

Botros, F.; Hassan, A.; Pohll, G.M.; 2006.

Block-effective Macrodispersivity in Heterogeneous Media with Spatially Varying Porosity. AGU. San Francisco, CA.

Boyle, D.P.; Lamorey, G.W.; Bassett, S.D.; Pohll, G.M.; Krause, P.; Kralish, S.; 2006.

Investigating the value of hydrologic model complexity and spatial information using multicriteria methods. International Association for Hydrological Sciences (IAHS). Nice, France.

Hassan, A.; Botros, F.; Reeves, D.M.; Pohll, G.M.; 2006.

On the continuum representation of fracture networks. American Geophysical Union. San Francisco, CA.

Lundmark, K.W.; Pohll, G.M.; Carroll, R.W.; Thomas, J.M.; 2006.

Regional Water Budget Accounting and Uncertainty Analysis Using a Deuterium-Calibrated Discrete State Compartment Model: White Pine County, Nevada, and Adjacent Areas in Nevada and Utah. American Geophysical Union. San Francisco, CA.

Botros, F.; Hassan, A.; Pohll, G.M.; 2006.

Assessment of Hydraulic Conductivity Upscaling Techniques and Associated Uncertainty. Denmark.

Reeves, D.M.; Pohlmann, K.F.; Pohll, G.M.; Chapman, J.B.; Ye, M.; 2006.

Incorporation of model and parameter uncertainty in predicting radionuclide fluxes from the Climax Granite Intrusive. American Geophysical Union. San Francisco, California.

Young, M.H.; Albright, W.H.; Pohlmann, K.F.; Pohll, G.M.; Zachritz, W.H.; Zitzer, S.F.; Shafer, D.S.; Nester, I.; Oyelowo, L.; 2006.

Designing Alternative Landfill Covers Using Parametric Uncertainty Analysis. American Society of Civil Engineers. Carefree, Arizona, USA.

Niswonger, R.; Regan, S.; Prudic, D.; Markstrom, S.; Pohll, G.M.; Viger, R.; 2005.

Development and implementation of the GSFLOW Model. GSA. Salt Lake City, UT.

Pohlmann, K.F.; Ye, M.; Pohll, G.M.; Chapman, J.B.; 2005.

Assessing recharge model uncertainty: Case study using the Death Valley Regional Flow System Model. AGU. San Francisco, CA.

Considine, E.; Wheatcraft, S.; Tadjeran, C.; Pohll, G.M.; 2005.

Tritium transport at the Nevada Test Site. Geologic Society of America. Salt Lake City, UT.

Pohll, G.M.; Berger, D.; Huntington, J.L.; Epstein, B.; 2004.

Quantification of the errors associated with recharge estimates to desert basins in Nevada. Nevada Water Resources Association.

Giroux, B.; Hackenberry, P.; Pohll, G.M.; 2004.

Expanding Las Vegas Wash perchlorate modeling. National Groundwater Association. Costa Mesa, CA.

Giroux, B.; Hackenberry, P.; Pohll, G.M.; 2004.

Las Vegas Wash perchlorate investigation. Batelle.

Stevick, E.; Pohll, G.M.; 2003.

Simulation of groundwater resources in the Fernley and dodge Flat hydrographic basins, Nevada. American Water Resources Association. New York, NY.

Shafer, D.S.; Chapman, J.B.; Hassan, A.; Pohll, G.M.; Pohlmann, K.F.; Young, M.H.; 2003.

Long-term stewardship and risk management for inactive nuclear test sites in the United States. Oxford, England.

Hassan, A.; Pohll, G.M.; Pohlmann, K.F.; Chapman, J.B.; 2002.

Groundwater flow and transport modeling: Three approaches for three different environments. The International Conference on Water Resources Management in Arid Regions (WaRMAR). Kuwait.

McGraw, D.; Pohll, G.; McKay, A.; 2000.

Evaluation of Groundwater Transport in Fernley- Wadsworth. Truckee River Symposium. Nevada Water Resources Association. Reno, NV.

Epstein, B.; Huntington, J.L.; Pohll, G.M.; 1990.

Quantification of the uncertainty associated with precipitation and recharge estimates of desert basins in Nevada. American Geophysical Union. Ft. Collins, CO.