Dr. Rishi Parashar

Associate Research Professor Hydrology
52697368692e5061726173686172406472692e656475
775-673-7496

Professional Interests

My research interest is in the area of developing models to characterize movement of water and entities such as contaminants, microbes, and heat on a continuum of scales in porous and fractured media. I use discrete fracture network (DFN) modeling tools to understand influence of network-scale hydraulic and geometric properties on plume migration in fractured rock formations. My co-researchers and I are interested in developing techniques for upscaling transport in fracture networks which can effectively account for correlations and connectivity structures. I am also interested in employing coupled thermo-hydro-mechanical models for enhanced geothermal systems and other fields of research where faults and fractures play an important role. Outside of fracture media related topics, I have interest in the wider research field of anomalous transport, particularly in relation to motile microbes and their implications for in-situ bioremediation.

Research Areas

  • Discrete fracture network (DFN) models
  • Contaminant transport
  • Characterization and properties of fracture networks
  • Coupled Thermo-hydro-mechanical models
  • Geothermal systems
  • Microbial Transport

Education

DegreeYearInstitutionArea
Ph.D. 2008 Purdue University, West Lafayette Civil Engineering
M.S. 2003 Purdue University, West Lafayette Civil Engineering
B.S. 2001 Indian Institute of Technology, Roorkee, India Civil Engineering

Academic Affiliations

Graduate Program of Hydrologic Sciences - University of Nevada Reno

Open Positions

One PhD graduate research assistantship and one post-doctoral position is available for fall 2019. Both positions will be supported by a U.S. Department of Energy (DOE) funded project to study transport of motile microbes in pore-networks using both experimental and numerical techniques. The project aims to understand fundamental motion characteristics of motile microbes and upscale the observed behavior to help develop improved predictive models for metal bioremediation. The experimental part of the project will be conducted at the Environmental Molecular Sciences Laboratory (EMSL). If you are interested, send your CV/resume.

Publications & Presentations

2019

Fan, Z., Parashar, R. (2019). Analytical solutions for a wellbore subjected to a non-isothermal fluid flux: Implications for optimizing injection rates, fracture reactivation, and EGS hydraulic stimulation, Rock Mechanics and Rock Engineering, Accepted

2018

Fan, Z., Parashar, R. (2018). Poroelastic response of a stationary fracture subjected to a constant fluid flux, Interpore 10th Annual Meeting and Jubilee: New Orleans, LA, May 14, 2018-May 17, 2018
Fan, Z., Parashar, R. (2018). Effect of Coupled Porothermoelastic Stress on Shear Stimulation of Enhanced Geothermal Systems, Proceedings, 43rd Workshop on Geothermal Reservoir Engineering: Stanford, CA, February 12, 2018-February 14, 2018
Fan, Z., Parashar, R. (2018). Coupled hydromechanical modeling to investigate effect of faults on stresses at a horizontal tunnel, NWRA Fall Symposium: Reno, September 25, 2018-September 26, 2018
Fan, Z., Parashar, R. (2018). An analytical solution for constant rate fluid injection into thermoporoelastic rocks with applications to hydraulic stimulation of enhanced geothermal systems, NWRA Fall Symposium: Reno, September 25, 2018-September 26, 2018
Fan, Z., Parashar, R. (2018). An integrated assessment of induced seismicity potential associated with enhanced geothermal systems, AGU Fall Meeting: Washington D.C., December 10, 2018-December 14, 2018
Parashar, R., Pham, H. V., Reeves, D. M. (2018). Investigation of primary flow paths in Western Pahute Pesa using models accounting for the influence of regional stress on fault permeability, DOE/NV/0003590-24
Parashar, R., Reeves, D. M. (2018). Determination of Well Capture Zones in Fractured Rock Systems Using Discrete Fracture Network Modeling Approach, AGU Fall Meeting: Washington D.C., December 10, 2018-December 14, 2018
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
Reeves, D. M., Parashar, R., Pham, H. V., Smith, K. D. (2018). Investigating Fault Interconnectivity and Stress Controls on Regional-Scale Fluid Flow at Pahute Mesa, Nevada National Security Site, Geological Society of America, North-Central Section Meeting: Ames, IA, April 16, 2018-April 17, 2018
Reeves, D. M., Parashar, R., Pham, H. V., Sund, N. L. (2018). Network Connectivity in Complex, Three-Dimensional Fracture Networks, Interpore 10th Annual Meeting and Jubilee: New Orleans, LA, May 14, 2018-May 17, 2018
Reeves, D. M., Pham, H. V., Sund, N. L., Parashar, R. (2018). Defining network connectivity in complex, three-dimensional fracture networks, GSA Annual Meeting: Indianapolis, November 4, 2018-November 7, 2018

2017

Parashar, R., Reeves, D. M. (2017). Ground Water Sustainability in Fractured Rock Aquifers, Eds. Ojha, C., Surampalli, R. Y., Bardossy, A., Zhang, T. C., Kao, C., In Sustainable Water Resources Management, 439-464, doi: 10.1061/9780784414767 American Society of Civil Engineers (ASCE)
Parashar, R., Reeves, D. M. (2017). Generalized Responses of Fractured Rock Aquifers to Pumping and Episodic Recharge, 277-280, Modflow & More 2017: Modeling for Sustainability and Adaptation: Golden, CO, May 21, 2017-May 24, 2017
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
Reeves, D. M., Smith, K. D., Parashar, R., Collins, C. M., Heintz, K. M. (2017). Investigating the Influence of Regional Stress on Fault and Fracture Permeability at Pahute Mesa, Nevada National Security Site
Sund, N. L., Parashar, R., Pham, H. V. (2017). Particle Decision Making Processes in Fractured Media: The War Between Models, 9th International Conference on Porous Media & Annual Meeting 2017: Rotterdam, Netherlands, May 8, 2017
Sund, N. L., Porta, G., Bolster, D., Parashar, R. (2017). A Lagrangian transport Eulerian reaction spatial (LATERS) Markov model for prediction of effective bimolecular reactive transport, 9th International Conference on Porous Media & Annual Meeting 2017: Rotterdam, Netherlands, May 8, 2017
Sund, N. L., Porta, G., Bolster, D., Parashar, R. (2017). A Lagrangian transport Eulerian reaction spatial (LATERS) Markov model for prediction of effective bimolecular reactive transport, Water Resources Research, 53, (11), 9040-9058
Sund, N. L., Yang, X., Parashar, R., Plymale, A., Hu, D., Kelly, R., Scheibe, T. (2017). Species and Scale Dependence of Bacterial Motion Dynamics, AGU Fall Meeting: New Orleans, LA, December 11, 2017-December 15, 2017
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
Trullenque, G., Parashar, R., Delcourt, C., Collet, L., Villard, P., Potel, S. (2017). Properties of a pair of fracture networks produced by triaxial deformation experiments: insights on fluid flow using discrete fracture network models, Hydrogeology Journal, 25, (3), 813-827

2016

Parashar, R., Reeves, D. M. (2016). Non-Fickian Migration of Inert Particles on Stochastic Fracture Networks, 8th International Conference on Porous Media & Annual Meeting: Cincinnati, OH, May 9, 2016-May 12, 2016
Parashar, R., Sund, N. L., Yang, X., Plymale, A., Hu, D., Kelly, R., Scheibe, T., Frederick, J. M. (2016). Study of transport characteristics of motile microorganisms using micro-scale devices, AGU Fall Meeting: San Francisco, CA, December 12, 2016-December 16, 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
Reeves, D. M., Smith, K. D., Parashar, R., Collins, C. M., Heintz, K. M. (2016). Determining the potential role of regional stress on preferential flow and transport at Pahute Mesa, Nevada National Security Site, AGU Fall Meeting: San Francisco, CA, December 12, 2016-December 16, 2016
Reeves, D. M., Smith, K. D., Parashar, R., Morton, C. G. (2016). Stress Field Inversions of Earthquake Focal Mechanisms and Influences of Regional Stress on Fault Permeability at Pahute Mesa, Nevada National Security Site
Sund, N. L., Parashar, R., Pham, H. V. (2016). Particle Decision Making Processes in Fractured Media: The Battle Between Models, AGU Fall Meeting: San Francisco, CA, December 12, 2016-December 16, 2016

2015

Parashar, R., Reeves, D. M. (2015). Study of Drawdown Characteristics of Fracture Rock Aquifers Using Discrete Fracture Network Modeling Tools, American Geophysical Union Fall Meeting: San Francisco, CA, December 14, 2015-December 18, 2015
Pau, G. S., Finsterle, S., Lee, K. J., Parashar, R., Zhang, Y. (2015). Fast Method to Predict Oil Production from Fractured Reservoir, TOUGH Symposium: Berkeley, CA, September 28, 2015-September 30, 2015
Pickman, L. H., Parashar, R., Reeves, D. M. (2015). Use of Discrete Fracture Network Statistics for Construction of Two-Dimensional Continuous Time Random Walk Model, American Geophysical Union Fall Meeting: San Francisco, CA, December 14, 2015-December 18, 2015
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
Reeves, D. M., Parashar, R. (2015). Generalized Responses of Fractured Rock Aquifers to Anthropogenic and Climatic Perturbations, American Institute of Professional Geologists: Anchorage, AK, September 19, 2015-September 22, 2015

2014

Parashar, R., Reeves, D. M. (2014). Numerical Investigation on Dispersive Characteristics of Fracture Networks, AGU Fall Meeting: San Francisco, CA
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
Pickman, L. H., Parashar, R., Reeves, D. M. (2014). Use of CTRW for Prediction of Radionuclide Migration in Fractured Tuff, AGU Fall Meeting: San Francisco, CA
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., Pohll, G. M., Carroll, R. W. (2014). Use of DFN Concepts in Understanding Hillslope Drainage in Fractured Rock, International Discrete Fracture Network Engineering Conference: Vancouver, Canada, October 21, 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

Benato, S., Reeves, D. M., Parashar, R., Elsworth, D., Taron, J., Davatzes, N., Hickman, S., Spielman, P. (2013). Computational investigation of THMC effects on transmissivity evolution during selected injection phases at Ormat Desert Peak EGS Project, NV, Thirty-Eight Workshop on Geothermal Reservoir Engineering: Stanford University, Stanford, California
Carroll, R. W., Parashar, R., Pohll, G. M., Reeves, D. M. (2013). The use of discrete fracture network simulations in the design of horizontal hillslope drainage networks in fractured rock, Engineering Geology, doi: 10.1016/j.enggeo.2013.05.013
Parashar, R., Reeves, D. M. (2013). Particle pair separation statistics for two-dimensional fracture networks,, AGU Fall Meeting
Pohll, G. M., Carroll, R. W., Reeves, D. M., Parashar, R., Muhunthan, B., Thyiyagarjah, S., Badger, T., Lowell, S., Willoughby, K. (2013). Design Guidelines for Horizontal Drains Used for Slope Stabilization
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

2012

Carroll, R. W., Pohll, G. M., Reeves, D. M., Badger, T., Muhunthan, B., Parashar, R. (2012). Design guidelines for horizontal drains used for slope stability, DOT Geohazards Conference. Aug 21-23, Tumwater, WA.
Cooper, C. A., Thomas, J. M., Lyles, B. F., Reeves, D. M., Pohll, G. M., Parashar, R. (2012). A Preliminary Geochemical Description of the Geothermal Reservoir at Astor Pass, Northern Pyramid Lake, Nevada, GRC 36th Annual Meeting: Reno, Nevada
Parashar, R., Reeves, D. M. (2012). On iterative solution techniques for flow in large two-dimensional discrete fracture networks, Journal of Computational and Applied Mathematics, doi: 10.1016/j.cam.2012.02.038
Parashar, R., Reeves, D. M. (2012). Characterization and numerical representation of fracture networks for fluid flow, heat and solute transport
Parashar, R., Reeves, D. M. (2012). Comparative performance of various Krylov subspace iterative methods for computation of flow in discrete fracture networks, 4th International Conference on Porous Media and Annual Meeting of the International Society for Porous Media: Purdue University, West Lafayette, Indiana
Reeves, D. M., Pohll, G. M., Lyles, B. F., Faulds, J., Louie, J., Ehni, B., Kratt, C., Cooper, C. A., Parashar, R., Pullammanappallil, S., Noel, D. (2012). Geothermal resource characterization and evaluation at Astor Pass, Nevada, 1371-1376
Reeves, D. M., Pohll, G. M., Lyles, B. F., Louie, J., Kratt, C., Faulds, J., Ehni, B., Siler, D., Pullammanappallil, S., Cooper, C. A., Parashar, R. (2012). Geophysical and hydrogeological characterization of the Astor Pass geothermal field, United States/New Zealand Joint Geothermal Workshop: Rotorua, New Zealand
Zhang, Y., Parashar, R., Reeves, D. M. (2012). Hydrogeologic characterization of fractured rock masses intended for disposal of radioactive waste, In Radioactive Waste

2011

Parashar, R. (2011). Computation of flow and transport in large and sparse fracture networks, SIAM Conference on Mathematical and Computational Issues in the Geosciences: Long Beach, CA
Parashar, R., Pohll, G. M., Reeves, D. M. (2011). A numerical investigation of soil-bedrock interface flow impedance, MODFLOW and MORE 2011: Integrated Hydrologic Modeling: Golden, CO
Parashar, R., Reeves, D. M. (2011). Computation of flow and transport in fracture networks on a continuum grid, MODFLOW and MORE 2011: Integrated Hydrologic Modeling: Golden, CO
Reeves, D. M., Huntington, J. L., Rajagopal, S., Pohll, G. M., Zhang, Y., Parashar, R. (2011). Integrated ground water - surface water modeling of Martis Valely for assessment of climate change impacts on basin-scale water resources, Nevada Water Resources Association 2011 Truckee River Symposium: Reno, NV
Reeves, D. M., Parashar, R., Pohlmann, K. F., LaBolle, E. M., Zhang, Y., Russell, C. E., Chapman, J. B. (2011). Predictions of long-term radionuclide transort at Rainier Mesa, Nevada National Security Site, 242nd American Chemistry Society National Meeting: Denver, CO
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

Klimczak, C., Schultz, R. A., Parashar, R., Reeves, D. M. (2010). Cubic law with aperture-length correlation: implications for network scale fluid flow, Hydrogeology Journal, doi: 10.1007/s10040-0090572-6
Parashar, R., Reeves, D. M. (2010). Deep vadose zone flow and transport behavior at T-Tunnel Complex, Rainier Mesa, Nevada National Security Site, Americal Geophysical Union Fall Meeting: San Francisco, CA

2009

Parashar, R. (2009). Dynamics of Motile Microbes, Stochastic Transport and Emergent Scaling in Earth-Surface Processes Meeting: Incline Village, NV
Parashar, R., Reeves, D. M. (2009). Mapping and upscaling techniques for efficient simulation of flow and transport on a two-dimensional fracture continuum, 2009 AGU Fall Meeting: San Francisco, CA
Parashar, R., Reeves, D. M. (2009). Flow and transport characteristics of fracture networks with length-aperture correlations, 2009 AGU Fall Meeting: San Francisco, CA

2008

Cushman, J. H., Park, M., Parashar, R. (2008). Renormalizing the chaotic dynamics of motile particles in fractal porous media, International Conference on Statistical Physics: Kolympari, Crete, Greece
Klimczak, C., Schultz, R. A., Parashar, R., Reeves, D. M. (2008). The cubic law re-evaluated: Quintic law for joint sets, Americal Geophysical Union Fall Meeting: San Francisco, CA
Parashar, R., Cushman, J. H. (2008). Scaling the fractional advective-dispersive equation for numerical evaluation of microbial dynamics in confined geometries with sticky boundaries, Journal of Computational Physics, 227, 6598-6611, doi: 10.1016/j.jcp.2008.03.021
Parashar, R., Cushman, J. H. (2008). Microbial dynamics in a slit-pore with sticky boundaries, Americal Geophysical Union Fall Meeting: San Francisco, CA
Parashar, R., O'Malley, D., Cushman, J. H. (2008). Mean first-passage time for superdiffusion in a slit pore with sticky boundaries, Physical Review E, 78, doi: 10.1103/PhysRevE.78.052101
Parashar, R., Reeves, D. M. (2008). Upscaling fracture properties in support of dual-permeability simulations, Americal Geophysical Union Fall Meeting: San Francisco, CA

2007

Parashar, R., Cushman, J. H. (2007). Finite-size lyapunov exponent for levy processes, Physical Review E, 76, doi: 10.1103/PhysRevE.76.017201
Parashar, R., Govindaraju, R. S., Hantush, M. M. (2007). Temporal moment analysis for volatile organic compounds in dual-porosity porous media: Loss fractions and effective parameters, Journal of Environmental Engineering - ASCE, 133, 879-890, doi: 10.1061/(ASCE)0733-9372

2006

Parashar, R., Govindaraju, R. S. (2006). Moment analysis for compounds undergoing sequential chain reactions with first-order decay, Stochastic Environmental Research and Risk Assessment, 20, 95-105, doi: 10.1007/s00477-005-0014-5
Parashar, R., Govindaraju, R. S. (2006). Evaluation of effective parameters for volatile organic compounds in porous media with mobile air phase, Transport in Porous Media, 63, 349-362, doi: 10.1007/s11242-005-7485-1

Authors

Abstract

 

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