Karl F. Pohlmann

Research Scientist Hydrogeology
4b61726c2e506f686c6d616e6e406472692e656475
702-862-5485
hydrogeology, groundwater flow systems, scientific visualization, springs, modeling, contaminant transport, uncertainty, spatial variability

Professional Interests

Mr. Pohlmann's experience and interests include characterization and analysis of hydrogeologic frameworks, groundwater flow, and contaminant transport through field data collection, interpretation and modeling. Field investigations focus on delineation of local and regional groundwater flow systems in the Great Basin and Mojave Deserts. The modeling emphasizes a stochastic approach, incorporating spatial variability in hydrogeologic parameters and the uncertainty in estimating these parameters, and has been used for development of conceptual models, site characterization and closure, delineation of wellhead protection areas, and development of risk assessments.

Research Areas

  • Contaminant Transport
  • Hydrogeological Controls on Availability and Quality of Ground Water
  • Integrated Watershed Systems

Education

DegreeInstitutionArea
M.S. Purdue University, West Lafayette, Indiana Geosciences
B.S. University of Minnesota, Minneapolis Geology

Publications & Presentations

2018

Heintz, K. M., Pohlmann, K. F., Healey, J. M. (2018). Letter Report: Well Evaluations for U-20aa PS 1D, U-20i PS 1D, U-19g PS 1D, and U-19c PS 2D at Pahute Mesa, Nevada National Security Site
Heintz, K. M., Pohlmann, K. F., Healey, J. M., Hausner, M. B. (2018). An application of distributed temperature sensing to characterize flow in a well complex during pumping, Vol. 60, (No. 6), doi: 10.1130/abs/2018AM-317210 Geological Society of America - Abstracts with Programs: Indianapolis, November 4, 2018-November 7, 2018
Heintz, K. M., Pohlmann, K. F., Healey, J. M., Hausner, M. B. (2018). An application of distributed temperature sensing to characterize flow in a well complex during pumping, Geological Society of America Annual Meeting: Indianapolis, IN, November 4, 2018-November 7, 2018, 160-6
Pham, H. V., Parashar, R., Sund, N. L., Pohlmann, K. F. (2018). Data-driven 3-D DFN model development for simulating fracture flow in Pahute Mesa, Nevada National Security Site, 2018 Devils Hole Workshop: Beatty, NV, May 2, 2018-May 4, 2018

2017

Healey, J. M., Heintz, K. M., Pohlmann, K. F. (2017). Ambient Chemistry Logging, TFM Logging, and Discrete-interval Fluid Sampling of ER-20-12
Heintz, K. M., Healey, J. M., Pohlmann, K. F. (2017). Ambient Chemtool Logging of ER-4-1_m1
Pham, H. V., Parashar, R., Sund, N. L., Pohlmann, K. F. (2017). Three-dimensional DFN Model Development and Calibration: A Case Study for Pahute Mesa, Nevada National Security Site, AGU Fall Meeting: New Orleans, LA, December 11, 2017-December 15, 2017
Pohlmann, K. F., Healey, J. M., Lyles, B. F., Cooper, C. A., Hershey, R. L. (2017). Hydrophysical Evaluation of Wells TW-B, TW-7, UE-6d, U-2gg PSE 3A, U-10L 1, and UE-6e in Yucca Flat, Desert Research Institute Publication No. 45274
Pohlmann, K. F., Heintz, K. M. (2017). Investigation of the Sources of Selected Springs in the Lake Mead National Recreation Area using Stable Isotopes
Rybarski, S. C., Pohll, G. M., Rajagopal, S., Pohlmann, K. F. (2017). Modeling Assessment of Pahrump Valley, NV, 2017 Devils Hole Workshop: May 3-5 2017, Beatty, Nevada
Thomas, J. M., Pohll, G. M., Chapman, J. B., Pohlmann, K. F., Parashar, R., Rybarski, S. C., Hershey, R. L., Fereday, W. H. (2017). Hydraulic fracturing in the upper Humboldt River basin, Nevada, USA. 15th Water-Rock Interaction International Symposium, WRI-15, Procedia Earth and Planetary Science, 17, 189-192, doi: 10.1016/j.proeps.2016.12.065

2016

Pham, H. V., Parashar, R., Sund, N. L., Pohlmann, K. F. (2016). Transport Behavior in Fractured Rock Under Conceptual and Parametric Uncertainty, AGU Fall Meeting: San Francisco, CA, December 12, 2016-December 16, 2016
Pohll, G. M., Chapman, J. B., Pohlmann, K. F., Plume, R., Parashar, R., Rybarski, S. C., Hershey, R. L., Fereday, W. H., Reeves, M., Thomas, J. M. (2016). Assessment of the Migration Potential of Hydraulic Fracturing Fluids in Northeastern Nevada, American Water Resources Association: Anchorage, AK, April 25, 2016-April 27, 2016
Pohlmann, K. F., Russell, C. E., Heintz, K. M. (2016). Evaluation of Sampling Technologies for Small-Diameter Wells and Piezometers at the Nevada National Security Site, UGTA TIE Workshop: Las Vegas, NV, October 13, 2016
Ye, M., Wang, L., Pohlmann, K. F., Chapman, J. B. (2016). Evaluating Groundwater Interbasin Flow Using Multiple Models and Multiple Types of Data, Groundwater, 54, (6), 805-817, doi: 10.1111/gwat.12422
Zhang, Y., Pohlmann, K. F. (2016). Parameter Uncertainty Analysis Using Monte Carlo Simulations for a Regional-scale Groundwater Model, AGU Fall Meeting: San Francisco, December 12, 2016-December 16, 2016

2015

Daniels, J. I., Chapman, J. B., Pohlmann, K. F. (2015). Approximating dose and risk for contaminants in groundwater from the Underground Nuclear Test Area of the Nevada National Security Site (NNSS), DOE/NV/0000939-25, DRI 45262
Pohll, G. M., Chapman, J. B., Pohlmann, K. F., Plume, R. W., Parashar, R., Rybarski, S. C., Hershey, R. L., Fereday, W. H., Reeves, D. M., Thomas, J. M., Albright, W. H. (2015). Interim Final Report, Hydraulic Fracturing in the Upper Humboldt River Basin, Aquifer Quality Assessment Program, Desert Research Institute Publication No. 41263
Pohlmann, K. F., Rajagopal, S., Pohll, G. M. (2015). Development of a Modeling Tool to Support Management of Groundwater Resources in Pahrump Valley, Nevada, Devils Hole Workshop: Ash Meadows, Nevada, May 6, 2015-May 8, 2015

2014

Parashar, R., Reeves, D. M., Zhang, Y., Pickman, L. H., Pohlmann, K. F., Russell, C. E., Chapman, J. B. (2014). Western Pahute Mesa Discrete Fracture Network Modeling and Upscaling, DOE UGTA TIE Workshop, July 16, 2014
Pohlmann, K. F., Russell, C. E., Healey, J. M. (2014). Evaluation of Groundwater Purging and Sampling in Small-Diameter Wells and Piezometers at the Nevada National Security Site, DOE UGTA TIE Workshop, July 16, 2014
Reeves, D. M., Parashar, R., Pohlmann, K. F., Zhang, Y., Russell, C. E., LaBolle, E., Chapman, J. B. (2014). Radionuclide Containment Properties of Fractured and Faulted Volcanic Tuff Units at the T-Tunnel Complex, Rainier Mesa, Nevada National Security Site, Waste Management 2014
Reeves, D. M., Parashar, R., Pohlmann, K. F., Russell, C. E., Chapman, J. B. (2014). Development and Calibration of Dual-Permeability Flow Models with Discontinuous Fault Networks, Vadose Zone Journal, 13, (8), 1-23, doi: 10.2136/vzj2013.10.0183
Zhang, Y., Parashar, R., Pohlmann, K. F., Chapman, J. B. (2014). Non-Fickian Transport in Fractured Media, AGU Fall Meeting: San Francisco, CA
Zhang, Y., Pohlmann, K. F., Chapman, J. B., Russell, C. E., Parashar, R. (2014). Capturing anomalous dynamics of conservative and reactive contaminant transport in fractured media from centimeter scales to kilometer scales, DOE UGTA TIE Workshop, July 16, 2014

2013

Pohlmann, K. F., Chapman, J. B., Russell, C. E. (2013). Use of a Regional Model to Support Site-Scale Groundwater Flow Modeling at Pahute Mesa, Nevada, Devil's Hole Workshop: Furnace Creek, Death Valley, California, May 1, 2013-May 3, 2013
Pohlmann, K. F., Meyer, W. J., Albright, W. H., Forsee, W. J. (2013). Assessment of Conditions at Closed Rural Landfills in Clark County, Nevada
Reeves, D. M., Parashar, R., Pohlmann, K. F., Russell, C. E., Chapman, J. B. (2013). Development and Calibration of Dual-Permeability Models in Complex Hydrogeologic Settings: An Example from the T-Tunnel Complex, Rainier Mesa, Nevada National Security Site, MODFLOW and MORE 2013: Translating Science into Practice: Golden, CO
Zhu, J., Pohlmann, K. F. (2013). Effective Approach to Calculate Groundwater Return Flow to a River from Irrigation Areas, Journal of Irrigation and Drainage Engineering, 140, (7), doi: 10.1061/(ASCE)IR.1943-4774.0000701 American Society of Civil Engineers

2012

Pohlmann, K. F., Chapman, J. B., Ye, M. (2012). Evaluation of Uncertainties in Regional Groundwater Flow at Pahute Mesa, Nevada, Devil's Hole Workshop 2012: Death Valley, California
Pohlmann, K. F., Ye, M. (2012). Numerical Simulation of Inter-basin Groundwater Flow into Northern Yucca Flat, Nevada National Security Site, Using the Death Valley Regional Flow System Model
Pohlmann, K. F., Zhu, J., Healey, J. M. (2012). Significance of Groundwater Divide in Water Accounting and Return Flow Calculation for Lower Colorado River Aquifers

2011

Pohlmann, K. F., Zhu, J., Healy, J., Matuska, P., Isakson, K. (2011). Development of a framework for analysis of water accounting in lower Colorado River aquifers, MODFLOW and More 2011: Integrated Hydrologic Modeling: Golden, Colorado
Reeves, D. M., Parashar, R., Pohlmann, K. F., Zhang, Y., LaBolle, E. M., Russell, C. E., Chapman, J. B. (2011). Predictions of long-term radionuclide transort at Rainier Mesa, Nevada National Security Site, 2011 AGU Fall Meeting: San Francisco, CA

2010

Carroll, R. W., Pohll, G. M., McGraw, D. S., Garner, C. B., Knust, A. M., Boyle, D. P., Minor, T. B., Bassett, S., Pohlmann, K. F. (2010). Mason Valley Groundwater Model: Linking Surface Water and Groundwater in the Walker River Basin, Nevada, Journal of American Water Resources Association, 46, (3), 554-573, doi: 10.1111/j.1752-1688.2010.00434.x
Pohlmann, K. F., Zhu, J., Chapman, J. B., Russell, C. E., Shafer, D. S., Carroll, R. W. (2010). Effect of porosity correlations on sensitivity of contaminant travel time, AGU Fall Meeting: San Francisco, California, U.S.A.
Reeves, D. M., Pohlmann, K. F., Pohll, G. M., Ye, M., Chapman, J. B. (2010). Incorporation of conceptual and parametric uncertainty into radionuclide flux estimates from a fractured granite rock mass, Stochastic Environmental Research and Risk Assessment, doi: 10.1007/s00477-010-0385-0
Zhu, J., Pohlmann, K. F., Chapman, J. B., Russell, C. E., Carroll, R. W., Shafer, D. S. (2010). Sensitivity of Solute Advective Travel Time to Porosities of Hydrogeologic Units, Ground Water, 48, doi: 10.1111/j.1745-6584.2009.00664.x
Zhu, J., Pohlmann, K. F., Chapman, J. B., Russell, C. E., Carroll, R. W., Shafer, D. S. (2010). Sensitivity to Formation Porosity of Contaminant Transport from Nevada Test Site to Yucca Mountain, Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management, ASCE, doi: 10.1061/(ASCE)HZ.1944-8376.0000047

2009

Chapman, J. B., Pohlmann, K. F., Russell, C. E., Pohll, G. M. (2009). Role of Groundwater Monitoring for Closure of Underground Nuclear Tests on the Nevada Test Site, American Geophysical Union: San Francisco
Ye, M., Pohlmann, K. F., Chapman, J. B., Pohll, G. M., Reeves, D. M. (2009). A model-averaging method for assessing groundwater conceptual model uncertainty, Ground Water, 48, 716-728, doi: 10.1111/j.1745-6584.2009.00633.x
Zhang, Y., LaBolle, E. M., Pohlmann, K. F. (2009). Monte Carlo simulation of superdiffusion and subdiffusion in macroscopically heterogeneous media, Water Resources Research, 45, (10), doi: 10.1029/2008WR007448 Article No. W10417
Zhu, J., Pohlmann, K. F., Chapman, J. B., Russell, C. E., Carroll, R. W., Shafer, D. S. (2009). Uncertainty and Sensitivity of Contaminant Travel Times from the Upgradient Nevada Test Site to the Yucca Mountain Area

2008

Carroll, R. W., Pohll, G. M., Pohlmann, K. F., Boyle, D. P., Garner, C. B., Knust, A. M. (2008). Preliminary Model of a Coupled Groundwater-Surface Water System, Mason Valley, Nevada, MODFLOW and More: Ground Water and Public Policy: Colorado School of Mines, Golden, CO USA
Pohlmann, K. F., Zhu, J., Chapman, J. B., Russell, C. E., Carroll, R. W., Shafer, D. S. (2008). Contaminant Travel Times from the Nevada Test Site to Yucca Mountain: Sensitivity to Porosity, AGU 2008 Fall Meeting: San Francisco, California, U.S.A.
Ye, M., Pohlmann, K. F., Chapman, J. B. (2008). Expert elicitation of recharge model probabilities for the Death Valley Regional Flow System, Journal of Hydrology, 354, 102-115
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
Zhang, Y., LaBolle, E. M., Pohlmann, K. F. (2008). Comparison of local and nonlocal transport theories: A Lagrangian description, Eos Tans. AGU: San Francisco, CA
Zhu, J., Pohlmann, K. F., Chapman, J. B., Russell, C. E., Carroll, R. W., Shafer, D. S. (2008). Uncertainty and Sensitivity of Contaminant Travel Times from Nevada the Test Site to Yucca Mountain, 2008 Devils Hole Workshop: Death Valley, CA

2007

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, doi: 10.1109/ISTAS.2007.4362211 International Symposium on Technology and Society: Risk, Uncertainty, Vulnerability: Las Vegas, Nevada
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, 1-2
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
Pohlmann, K. F., Ye, M., Reeves, D. M., Zavarin, M., Decker, D. L., Chapman, J. B. (2007). Modeling of Groundwater Flow and Radionuclide Transport at the Climax Mine sub-CAU, Nevada Test Site
Reeves, D. M., Schultz, R. A., Bingham, C., Pohlmann, K. F., Russell, C. E., Chapman, J. B. (2007). Characterization of preferential pathways at the T-Tunnel Complex, Rainier Mesa, Nevada, American Geophysical Union Fall Meeting: San Francisco

2006

Pohlmann, K. F., Zhu, J., Ye, M., Carroll, R. W., Chapman, J. B., Russell, C. E., Shafer, D. S. (2006). Evaluation of Groundwater Pathways and Travel Times From the Nevada Test Site to the Potential Yucca Mountain Repository
Pohlmann, K. F., Zhu, J., Ye, M., Chapman, J. B., Russell, C. E., Shafer, D. S., Carroll, R. W. (2006). Evaluation of Groundwater Pathways and Travel Times from the Nevada Test Site to the Potential Yucca Mountain Repository
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
Ye, M., Pohlmann, K. F., Chapman, J. B., Shafer, D. S. (2006). On Evaluation of Recharge Model Model Uncertainty, a Priori and a Posteriori
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
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, 5, 742-750
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., In Unsaturated Soils, 682-694
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
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, Unsaturated Soils 2006: Proceedings of the Fourth International Conference on Unsaturated Soils, Geotechnical Special Publication, No. 147, 682-693, ASCE: Reston, VA, April 2, 2006-April 6, 2006
Zhu, J., Pohlmann, K. F., Ye, M., Shafer, D. S., Carroll, R. W. (2006). Groundwater pathways from regions upgradient of potential Yucca Mountain repository, 623-629

2005

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
Shafer, D. S., Martin, C., Pohlmann, K. F., Russell, C. E., Ye, M., Engelbrecht, J. P., Minor, T. B., Bishop, L. (2005). Establishing baseline environmental conditions for the proposed Yucca mountain repository, Nevada, U.S.A.
Ye, M., Neuman, S. P., Meyer, P. D., Pohlmann, K. F. (2005). Sensitivity analysis and assessment of prior model probabilities in MLBMA with application to unsaturated fractured tuff, Water Resources Research, 41
Ye, M., Pohlmann, K. F. (2005). Assessment of Uncertainty in Groundwater Recharge Models

2004

Albright, W. H., Young, M. H., Pohlmann, K. F., Zitzer, S. F. (2004). Sensitivity analysis as a design tool for alternative final landfill covers
Hassan, A., Chapman, J. B., Pohlmann, K. F. (2004). Uncertainty Analysis of Seawater Intrusion and Implications for Radionuclide Transport at Amchitka Islands Underground Nuclear Tests, In Coastal Aquifer Management: Monitoring, Modeling, and Case Studies, 207-231
Ye, M., Meyer, P. D., Neuman, S. P., Pohlmann, K. F. (2004). Estimating Prior Model Probabilities Using an Entropy Principle
Young, M. H., Albright, W. H., Zachritz, W., Shafer, D. S., Pohlmann, K. F., Cablk, M. E., Zitzer, S. F., McDonald, E. V. (2004). Technical approach for designing alternative covers at Edwards Air Force Base, California., Prepared for Air Force Flight Test Center, Environmental Management Directorate, Edwards Air Force Base, California, Desert Research Institute publication No. 41192, Contract #DACA05-02-C-0009

2003

Pohlmann, K. F., Pohll, G. M. (2003). Documentation for the Hydrogeologic Database of the BMI Complex, Henderson, Nevada, DRI Report No. 41190
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
Young, M. H., Albright, W. H., Zachritz, W., Shafer, D. S., Pohlmann, K. F., Cablk, M. E., Zitzer, S. F., McDonald, E. V. (2003). Technical Approach for Designing Alternative Covers at Edwards Air Force Base, California, DRI Report No. 41192
Young, M. H., Pohlmann, K. F. (2003). Analysis of Vadose Zone Monitoring System Computer Simulation of Water Flux Under Conditions of Variable Vegetative Cover: E-Area Disposal Trenches, DRI Report No. 41188

2002

Hassan, A., Pohll, G. M., Pohlmann, K. F., Chapman, J. B. (2002). Groundwater flow and transport modeling: Three approaches for three different environments, 223-242

2001

Young, M. H., Pohlmann, K. F. (2001). Analysis of Vadose Zone Monitoring Systems -- Computer Simulationn of Water Flux: E-Area Trenches, DRI Report No. 41172

1998

Pohlmann, K. F., Campagna, D., Chapman, J. B., Earman, S. B. (1998). Investigation of the Origin of Springs in the Lake Mead National Recreation Area, 51, DRI Report No. 41161

1996

Mizell, S. A., McArthur, R., Pohlmann, K. F., Hess, J. W., Urzendowski, L. (1996). Temporal Variability of Major Ion and Volatile Organic Compound Concentration in Arid Region Wells, 63 p., U.S. EPA: Washington, D.C., DRI Publication No. 41143

1994

Petersen, R., Pohlmann, K. F., McKay, W. A. (1994). Final Documentation Washoe Valley Groundwater Model, 39, DRI Report No. 41138
Pohlmann, K. F., Icopini, G., McArthur, R. (1994). Evaluation of Sampling and Field-Filtration Methods for the Analysis of Trace Metals in Groundwater, DRI Report No. 41137

1992

Pohlmann, K. F., Alduino, A. (1992). Potential Sources of Error in Ground-Water Sampling at Hazardous Waste Sites, 28 p., U.S. Environmental Protection Agency, Environmental Monitoring Systems Laboratory: Las Vegas, NV, EPA/540/S=92/019 (DRI Report No. 41141)

1990

Pohlmann, K. F., Blegen, R., Hess, J. W. (1990). Field Comparison of Ground-Water Sampling Devices for Hazardous Waste Sites: An Evaluation Using Volatile Organic Compounds, 112, DRI Report No. 41130

Authors

Abstract