Dr. Rishi Parashar
Research Professor, Hydrology
Phone
775-673-7496
E-Mail
Campus
Reno Campus
Full Resume / CV
Division
Hydrologic Sciences
Research Interests
Computational Subsurface Hydrology: Discrete fracture network (DFN) models, anomalous transport in porous media, upscaling for flow and transport, inverse modeling
Hydro-bio-chemical Systems: Reactive transport models, microbial motility, biofilm growth, biogeochemical reactions, geochemical evolution of groundwater
Thermo-Hydro-Mechanical Interactions: Enhanced geothermal systems (EGS), induced seismicity
Education
| Degree | Year | Institution | Area |
|---|---|---|---|
| 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
Publications
2022
, , , (2022). Contributions of biofilm-induced flow heterogeneities to solute retention and anomalous transport features in porous media, Water Research, 209, 117896, 10.1016/j.watres.2021.117896
, , , (2022). Fracture connectivity and flow path tortuosity elucidated from advective transport to a pumping well in complex 3D networks, Engineering Geology, 106960, 10.1016/j.enggeo.2022.106960
2021
, , , , (2021). Impact of confined geometries on hopping and trapping of motile bacteria in porous media, Physical Review E, 103 (1), 012611
, , (2021). Upscaling of transport through discrete fracture networks via random walk: A comparison of models, Physical Review E, 103 (6), 062116
, , (2021). Impact of Horizontal Spatial Clustering in Two-Dimensional Fracture Networks on Solute Transport, Journal of Hydrology, 603 (Part C), 127055, 10.1016/j.jhydrol.2021.127055
, , , , , (2021). Upscaling Mixing-Controlled Reactions in Unsaturated Porous Media, Transport in Porous Media, 10.1007/s11242-021-01710-2
, , , (2021). The Influence of Compost on Arsenic Removal from Contaminated Groundwater in Granitic Aquifers, Journal of Nevada Water Resources Assoication (Winter 2021), 42-54. Nevada Water Resources Association, 10.22542/jnwra/2021/1/2
https://www.nvwra.org/journal
https://www.nvwra.org/journal
2020
, , (2020). Impact of convective cooling on pore pressure and stresses around a borehole subjected to a constant flux: Implications for hydraulic tests in an enhanced geothermal system reservoir, Interpretation, 8 (2), 10.1190/INT-2019-0180.1
, , (2020). Enhancing fracture-network characterization and discrete-fracture-network simulation with high-resolution surveys using unmanned aerial vehicles, Hydrogeology Journal, 10.1007/s10040-020-02178-y
, (2020). Transient flow to a finite-radius well with wellbore storage and skin effect in a poroelastic confined aquifer, Advances in Water Resources, 10.1016/j.advwatres.2020.103604
, , , (2020). A Method to Represent a Well in a Three?dimensional Discrete Fracture Network Model, Groundwater, 10.1111/gwat.13030
, , , (2020). Determination of fracture apertures via calibration of three-dimensional discrete-fracture-network models: application to Pahute Mesa, Nevada National Security Site, USA, Hydrogeology Journal, 10.1007/s10040-020-02254-3
, , , , , (2020). Evaluation of Timber Mountain Recharge and Groundwater Flow in Relation to Pahute Mesa-Oasis Valley Flow System. Desert Research Institute, DOE/NV/0003590-56, https://doi.org/10.2172/1727435
, , (2020). Geochemical evolution of the groundwater at the Reno-Stead Water Reclamation Facility.. Truckee Meadows Water Authority Report
2019
, (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, 10.1007/s00603-019-01867-9
, , , , , , (2019). On Modeling Ensemble Transport of Metal Reducing Motile Bacteria, Scientific Reports (9:14638), 10.1038/s41598-019-51271-0
, , (2019). Development of Upscaling Techniques and Construction of Calibrated Models for Fractured Rocks Using Discrete Fracture Network Approaches, DOE/NV/0003590-43
2018
, , (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
2017
, (2017). Ground Water Sustainability in Fractured Rock AquifersChapter 17: Ground Water Sustainability in Fractured Rock Aquifers. In , Sustainable Water Resources Management, 439-464. American Society of Civil Engineers (ASCE), 10.1061/9780784414767
, , , , , , , (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, 10.1016/j.proeps.2016.12.065
, , , (2017). A Lagrangian transport Eulerian reaction spatial (LATERS) Markov model for prediction of effective bimolecular reactive transport, Water Resources Research, 53 (11), 9040-9058
, , , , (2017). Investigating the Influence of Regional Stress on Fault and Fracture Permeability at Pahute Mesa, Nevada National Security Site, DOE/NV/0000939-41
, , , , , (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
, , , (2016). Stress Field Inversions of Earthquake Focal Mechanisms and Influences of Regional Stress on Fault Permeability at Pahute Mesa, Nevada National Security Site
2015
, , , , , , , , , , (2015). Interim Final Report, Hydraulic Fracturing in the Upper Humboldt River Basin, Aquifer Quality Assessment Program, Desert Research Institute Publication No. 41263
2014
, , , , (2014). Development and Calibration of Dual-Permeability Flow Models with Discontinuous Fault Networks, Vadose Zone Journal, 13 (8), 1-23, 10.2136/vzj2013.10.0183
2013
, , , , , (2013). The use of discrete fracture network simulations in the design of horizontal hillslope drainage networks in fractured rock, Engineering Geology, 163, 132-143, 10.1016/j.enggeo.2013.05.013
, , , , , , , , (2013). Design Guidelines for Horizontal Drains Used for Slope Stabilization: Washington State Department of Transportation Report, WA-RD 787.1
2012
, (2012). On iterative solution techniques for flow in large two-dimensional discrete fracture networks, Journal of Computational and Applied Mathematics, 10.1016/j.cam.2012.02.038
, , (2012). Hydrogeologic characterization of fractured rock masses intended for disposal of radioactive wasteChapter : Hydrogeologic characterization of fractured rock masses intended for disposal of radioactive waste. In , Radioactive Waste. IntechOpen
2010
, , , (2010). Cubic law with aperture-length correlation: implications for network scale fluid flow, Hydrogeology Journal, 10.1007/s10040-0090572-6
2008
, (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, 10.1016/j.jcp.2008.03.021
, , (2008). Mean first-passage time for superdiffusion in a slit pore with sticky boundaries, Physical Review E, 78, 10.1103/PhysRevE.78.052101
2007
, (2007). Finite-size lyapunov exponent for levy processes, Physical Review E, 76, 10.1103/PhysRevE.76.017201
, , (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, 10.1061/(ASCE)0733-9372
2006
, (2006). Moment analysis for compounds undergoing sequential chain reactions with first-order decay, Stochastic Environmental Research and Risk Assessment, 20, 95-105, 10.1007/s00477-005-0014-5
, (2006). Evaluation of effective parameters for volatile organic compounds in porous media with mobile air phase, Transport in Porous Media, 63, 349-362, 10.1007/s11242-005-7485-1
Conference Proceedings
2022
, , (2022). Bacterial motility dynamics in open and confined porous media, EGU General Assembly: Vienna, Austria, May 23, 2022-May 27, 2022, EGU22-1561
, , , , (2022). Hydrodynamic Influences on the Transport of Motile Bacteria in Porous Media, Gordon Research Conference (GRC) – Flow and Transport in Permeable Media: Les Diablerets, VD, Switzerland, July 17, 2022-July 22, 2022
, , , , , (2022). Evaluation of Particle Tracking Codes for Dispersing Particles in Porous Media, AGU Fall Meeting: Chicago, IL, December 12, 2022-December 16, 2022, H22T-1102
, , , (2022). Influence of bacterial swimming mechanisms and pore confinement on bacterial spreading, AGU Fall Meeting: Chicago, IL, December 12, 2022-December 16, 2022, H22T-1106
, (2022). Modeling Bioclogging and Preferential Flow Path Formation in the Hyporheic Zone, AGU Fall Meeting: Chicago, IL, December 12, 2022-December 16, 2022, H42D-1272
, (2022). Exploring Quantum Algorithms to Determine Well Capture Zones in 2D Fractured Rock Systems, AGU Fall Meeting: Chicago, IL, December 12, 2022-December 16, 2022, H52K-0586
2021
, , , (2021). The influence of compost on arsenic removal from contaminated groundwater in granitic aquifers. UCOWR/NIWR Annual Water Resources Conference, June 8, 2021-June 11, 2021
, , , , , (2021). Modelling of Fractured Granitic Geothermal Reservoirs: Use of Deterministic and stochastic methods in Discrete Fracture Networks and a Coupled Processes Modeling Framework. Proceedings World Geothermal Congress: Reykjavik, Iceland, May 21, 2021-May 26, 2021, 10.5281/zenodo.5614479
, , , (2021). The Influence of an Iron Metal-Organic Framework Material on Arsenic Sorption in Groundwater: Column Experiments and Simulations. AGU Fall Meeting: New Orleans, LA, December 13, 2021-December 17, 2021, H45Q-1376
, , , (2021). Estimating solute transport in heterogeneous porous media via machine learning. AGU Fall Meeting: New Orleans, LA, December 13, 2021-December 17, 2021
, , , (2021). Heterogeneous Flow Field in Presence of Biofilms and its Impact on Solute Transport and Retention. AGU Fall Meeting: New Orleans, LA, December 13, 2021-December 17, 2021
, , , , (2021). Impacts of flow on transport of motile microbes in synthetic porous media. AGU Fall Meeting: New Orleans, LA, December 13, 2021-December 17, 2021
, , , , , (2021). Upscaling mixing-controlled reactions in unsaturated porous media. AGU Fall Meeting: New Orleans, LA, December 13, 2021-December 17, 2021
2020
, , , , , (2020). Influence of pore geometry on motility and trapping of metal reducing bacteria. 22nd European Geosciences Union General Assembly: Online, May 4, 2020-May 8, 2020
, , , , (2020). The Effect of Pore Geometry on Upscaled Models of Transport of Motile Bacteria. American Geophysical Union Fall Meeting 2020: Online, December 1, 2020-December 17, 2020
, , , , (2020). Modeling migration of motile bacteria in confined porous media. American Geophysical Union Fall Meeting 2020: Online, December 1, 2020-December 17, 2020
, (2020). Impact of Formation Permeability and Pumping Well Properties on Hydraulic Drawdown in Poroelastic Confined Aquifers. American Geophysical Union Fall Meeting 2020: Online, December 1, 2020-December 17, 2020
, , (2020). Prevalence of Fracture Spatial Clustering and Implications for Solute Transport. American Geophysical Union Fall Meeting 2020: Online, December 1, 2020-December 17, 2020
, , (2020). Improving fracture network characterization and discrete fracture network flow simulations using unmanned aerial vehicles. GSA Annual Meeting: Online, October 26, 2020-October 30, 2020
, , , , , (2020). Impact of Flow Heterogeneities on Mixing-Controlled Reactions Using Pore-Scale Modeling and Experimental Data. Computational Methods in Water Resources (CMWR): Online, December 14, 2020-December 17, 2020
, , , , , (2020). Upscaling mixing-controlled reactions in unsaturated porous media. Computational Methods in Water Resources Conference, December 14, 2020-December 17, 2020
https://easychair.org/smart-slide/slide/J6TX#
https://easychair.org/smart-slide/slide/J6TX#
2019
, , (2019). Fracture Apertures in Lava-flow Aquifers Computed via Flow and Transport Calibration of Discrete Fracture Network Models. UGTA Technical Information Exchange: Las Vegas, August 29, 2019
, , (2019). Upscaling of Transport in Fracture Networks via Random Walk Based Methods. UGTA Technical Information Exchange: Las Vegas, August 29, 2019
, , (2019). Impact of Regional Stress on Large-scale Flow Path Configurations in Western Pahute Mesa. UGTA Technical Information Exchange, August 29, 2019
, , , , , (2019). Evaluation of Timber Mountain Recharge and Groundwater Flow in Relation to Pahute Mesa Groundwater Flow. Department of Energy, Underground Test Area Activity, Technical Information Exchange, August 29, 2019
, , (2019). Constraining Aperture Values by Calibrating a Discrete Fracture Network Model to Tracer Test Data. dfnWorkShop: Santa Fe, New Mexico, September 23, 2019-September 25, 2019
, , , , , (2019). Species and Scale Dependence of Bacterial Motion Dynamics. AGU Fall Meeting: San Francisco, CA, December 9, 2019-December 13, 2019
, (2019). Poroelastic effect on transient flow to a pumping well with storage and finite thickness skin. AGU Fall Meeting: San Francisco, CA, December 9, 2019-December 13, 2019
, , (2019). Determination of Fracture Apertures via Calibration of Discrete Fracture Network Models. AGU Fall Meeting: San Francisco, CA, December 9, 2019-December 13, 2019
, , , , , , (2019). Integrated Use of Data and Numerical Models for Site Conceptual Model Development In Complex Hydrogeologic Systems. 2019 NGWA Conference on Fractured Rock and Groundwater: Burlington, VT, September 23, 2019-September 24, 2019
2018
, , , (2018). Network Connectivity in Complex, Three-Dimensional Fracture Networks. Interpore 10th Annual Meeting and Jubilee: New Orleans, LA, May 14, 2018-May 17, 2018
, , , (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
, , , (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
, (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
, (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
, , , (2018). Defining network connectivity in complex, three-dimensional fracture networks. GSA Annual Meeting: Indianapolis, November 4, 2018-November 7, 2018
, (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
, (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
, (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
, (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
2017
, , , (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
, , (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
, (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
, , , , , , (2017). Species and Scale Dependence of Bacterial Motion Dynamics. AGU Fall Meeting: New Orleans, LA, December 11, 2017-December 15, 2017
, , , (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
2016
, (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
, , (2016). Particle Decision Making Processes in Fractured Media: The Battle Between Models. AGU Fall Meeting: San Francisco, CA, December 12, 2016-December 16, 2016
, , , (2016). Transport Behavior in Fractured Rock Under Conceptual and Parametric Uncertainty. AGU Fall Meeting: San Francisco, CA, December 12, 2016-December 16, 2016
, , , , (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
, , , , , , , (2016). Study of transport characteristics of motile microorganisms using micro-scale devices. AGU Fall Meeting: San Francisco, CA, December 12, 2016-December 16, 2016
, , , , , , , , , (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
2015
, (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
, , , , (2015). Fast Method to Predict Oil Production from Fractured Reservoir. TOUGH Symposium: Berkeley, CA, September 28, 2015-September 30, 2015
, , (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
, (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
2014
, , , , , , (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
, , , , (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
, , , (2014). Use of DFN Concepts in Understanding Hillslope Drainage in Fractured Rock. International Discrete Fracture Network Engineering Conference: Vancouver, Canada, October 21, 2014
, , , , , , (2014). Western Pahute Mesa Discrete Fracture Network Modeling and Upscaling. DOE UGTA TIE Workshop, July 16, 2014
, , , (2014). Non-Fickian Transport in Fractured Media. AGU Fall Meeting: San Francisco, CA
, (2014). Numerical Investigation on Dispersive Characteristics of Fracture Networks. AGU Fall Meeting: San Francisco, CA
, , (2014). Use of CTRW for Prediction of Radionuclide Migration in Fractured Tuff. AGU Fall Meeting: San Francisco, CA
2013
, , , , (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
, , , , , , , (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
, (2013). Particle pair separation statistics for two-dimensional fracture networks,. AGU Fall Meeting
2012
, , , , , (2012). A Preliminary Geochemical Description of the Geothermal Reservoir at Astor Pass, Northern Pyramid Lake, Nevada, 36, 37-40. GRC Transactions: Reno, Nevada
, , , , , , , , , , (2012). Geothermal resource characterization and evaluation at Astor Pass, Nevada, 36, 1371-1376. GRC Transactions
, (2012). Characterization and numerical representation of fracture networks for fluid flow, heat and solute transport
, (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
, , , , , , , , , , (2012). Geophysical and hydrogeological characterization of the Astor Pass geothermal field. United States/New Zealand Joint Geothermal Workshop: Rotorua, New Zealand
, , , , , (2012). Design guidelines for horizontal drains used for slope stability. DOT Geohazards Conference. Aug 21-23, Tumwater, WA.
2011
, (2011). Computation of flow and transport in fracture networks on a continuum grid. MODFLOW and MORE 2011: Integrated Hydrologic Modeling: Golden, CO
, , (2011). A numerical investigation of soil-bedrock interface flow impedance. MODFLOW and MORE 2011: Integrated Hydrologic Modeling: Golden, CO
(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
, , , , , , (2011). Predictions of long-term radionuclide transort at Rainier Mesa, Nevada National Security Site. 2011 AGU Fall Meeting: San Francisco, CA
, , , , , (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
, , , , , , (2011). Predictions of long-term radionuclide transort at Rainier Mesa, Nevada National Security Site. 242nd American Chemistry Society National Meeting: Denver, CO
2010
, (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
(2009). Dynamics of Motile Microbes. Stochastic Transport and Emergent Scaling in Earth-Surface Processes Meeting: Incline Village, NV
, (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
, (2009). Flow and transport characteristics of fracture networks with length-aperture correlations. 2009 AGU Fall Meeting: San Francisco, CA
2008
, , (2008). Renormalizing the chaotic dynamics of motile particles in fractal porous media. International Conference on Statistical Physics: Kolympari, Crete, Greece
, , , (2008). The cubic law re-evaluated: Quintic law for joint sets. Americal Geophysical Union Fall Meeting: San Francisco, CA
, (2008). Upscaling fracture properties in support of dual-permeability simulations. Americal Geophysical Union Fall Meeting: San Francisco, CA
, (2008). Microbial dynamics in a slit-pore with sticky boundaries. Americal Geophysical Union Fall Meeting: San Francisco, CA