Dr. Rina A. Schumer

Asst VP of Academic and Faculty Affairs
Transport, stochastic, probability, groundwater, advection-dispersion, sediment transport, stratigraphy, model, earth surface dynamics, hyporheic, mathematical, hydraulics, lidar, matlab

Professional Interests

Dr. Schumer's primary research interests involve stochastic models for environmental processes. She uses mathematical models to enhance understanding of subsurface transport in porous and fractured media, surface-subsurface exchange, sediment transport, as well as geomorphic processes and their signature in the geologic record. Using her background in applied mathematics, she also has projects that employ optimization techniques, time series analysis, extreme value theory, and probability and statistics.

Research Areas

  • Hydrology/Hydrogeology
  • Stochastic Processes
  • Optimization
  • Extreme Value Theory
  • Environmental Transport Processes
  • Statistical Hydrology
  • Stratigraphy
  • Geomorphology


Ph.D. 2002 University of Nevada, Reno Hydrogeology
M.S. 2000 University of Nevada, Reno, Applied Mathematics
M.S. 1997 University of Nevada, Reno, Hydrogeology
B.S. 1992 Wesleyan University Earth and Environmental Sciences

Academic Affiliations

Publications & Presentations


Carroll, R. W., Deems, J. S., Niswonger, R., Schumer, R., Williams, K. H. (2019). The Importance of Interflow to Groundwater Recharge in a Snowmelt-Dominated Headwater Basin, Geophysical Research Letters, doi: 10.1029/2019GL082447
Fang, Z., Carroll, R. W., Schumer, R., Harman, C., Wilusz, D., Williams, K. H. (2019). Streamflow partitioning and transit time distribution in snow-dominated basins as a function of climate, Journal of Hydrology, 570, 726-738, doi: 10.1016/j.hydrol.2019.01.029
Kostadinov, T. S., Schumer, R., Hausner, M. B., Bormann, K. J., Gaffney, R., McGwire, K. C., Painter, T. H., Tyler, S., Harpold, A. A. (2019). Watershed-Scale Mapping of Fractional Snow Cover Under Conifer Forest Canopy Using Lidar, Remote Sensing of Environment, 222, 34-49, doi: 10.1016/j.rse.2018.11.037


Doane, T. H., Furbish, D. J., Roering, J. J., Schumer, R., Morgan, D. J. (2018). Nonlocal sediment transport on steep lateral moraines, eastern Sierra Nevada, California, USA, Journal of Geophysical Research: Earth Surface, doi: 10.1002/2017JF004325 Article ID: JGRF20790
Furbish, D. J., Roering, J. J., Keen-Zebert, A. K., Almond, P., Doane, T. H., Schumer, R. (2018). Soil Particle Transport and Mixing Near a Hillslope Crest: 2. Cosmogenic Nuclide and Optically Stimulated Luminescence Tracers, Journal of Geophysical Research: Earth Surface, 123, (5), 1078-1093
Zhang, L., Stark, C., Schumer, R., Kwang, J., Li, T., Fu, X., Wang, G., Parker, G. (2018). The Advective-Diffusive Morphodynamics of Mixed Bedrock-Alluvial Rivers Subjected to Spatiotemporally Varying Sediment Supply, Journal of Geophysical Research: Earth Surface, doi:10.1029/2017JF004431


Furbish, D. J., Fathel, S. L., Schmeeckle, M. W., Jerolmack, D. J., Schumer, R. (2017). The Elements and Richness of Particle Diffusion During Sediment Transport at Small Timescales, Earth Surface Processes and Landforms, 42, (1), 214-237, doi: 10.1002/esp.4084
Harpold, A. A., Kaplan, M. L., Klos, P. Z., Link, T., McNamara, J. P., Rajagopal, S., Schumer, R., Steele, C. M. (2017). Rain or Snow: Hydrologic Processes, Observations, Prediction, and Research Needs, Hydrol. Earth Syst. Sci., 21, (1), 1-22, doi: 10.5194/hess-21-1-2017
Harpold, A. A., Rajagopal, S., Crews, J. B., Winchell, T., Schumer, R. (2017). Relative Humidity Has Uneven Effects on Shifts from Snow to Rain Over the Western US, Geophysical Research Letters, 44, (19), 9742-9750, doi: 10.1002/2017GL075046
Schumer, R., Taloni, A., Furbish, D. (2017). Theory connecting non-local sediment transport, earth surface roughness, and the Sadler effect, Geophysical Research Letters, n/a-n/a, doi: 10.1002/2016GL072134


Furbish, D. J., Schmeeckle, M. W., Schumer, R., Fathel, S. L. (2016). Probability Distributions of Bed-load Particle Velocities, Accelerations, Hop Distances and Travel Times Informed by Jaynes's Principle of Maximum Entropy, Journal of Geophysical Research: Earth Surface, doi: 10.1002/2016JF003833
Pelosi, A., Schumer, R., Parker, G., Ferguson, R. I. (2016). The cause of advective slowdown of tracer pebbles in rivers: Implementation of Exner-Based Master Equation for coevolving streamwise and vertical dispersion, Journal of Geophysical Research, Earth Surface, 121, doi: 10.1002/2015JF003497


Aubeneau, A. F., Martin, R., Bolster, D., Schumer, R., Jerolmack, D., Packman, A. (2015). Fractal patterns in riverbed morphology produce fractal scaling of water storage times, Geophys. Res. Lett., 42, doi: 10.1002/2015GL064155.
Aubeneau, A., Drummond, J., Schumer, R., Bolster, D., Tank, J. L., Packman, A. I. (2015). Effects of benthic and hyporheic reactive transport on breakthrough curves, Freshwater Science, 34, (1), doi: 10.1086/680038
Backes, T. M., Kaplan, M. L., Schumer, R., Mejia, J. F. (2015). A Climatology of the Vertical Structure of Water Vapor Transport to the Sierra Nevada in Cool Season Atmospheric River Precipitation Events, J. Hydrometeor., 16, (3), 1029-1047, doi: 10.1175/JHM-D-14-0077.1
Johnson, Z. C., Warwick, J. J., Schumer, R. (2015). A numerical investigation of the potential impact of stream restoration on in-stream N removal, Ecological Engineering, 83, 96--107, doi: 10.1016/j.ecoleng.2015.05.024
McDonald, E. V., Schumer, R. (2015). Use of Ground-Based LiDAR for Detection of IED Command Wires on Typical Desert Surfaces, In Military Geosciences and Desert Warfare: Past Lessons and Modern Challenges, Springer Verlag
Pearson, C., Schumer, R., Trustman, B. D., Rittger, K., Johnson, D. W., Obrist, D. (2015). Nutrient and Mercury Deposition and Storage in an Alpine Snowpack of the Sierra Nevada, USA, Biogeosciences, 12, 3665-3680, doi: 10.5194/bg-12-3665-2015


Baeumer, B., Zhang, Y., Schumer, R. (2014). Incorporating super-diffusion due to sub-grid heterogeneity to capture non-Fickian transport, Groundwater, doi: 10.1111/gwat.12267
Cooper, C. A., Crews, J. B., Schumer, R., Breitmeyer, R. J., Voepel, H. E., Decker, D. L. (2014). Experimental investigation of transient thermal convection in porous media, Transport in Porous Media, 104, (2), 335-347, doi: 10.1007/s11242-014-0337-0
Finnegan, N. J., Schumer, R., Finnegan, S. (2014). A signature of transience in bedrock river incision rates over timescales of 10^4-10^7 years, Nature, 505, 391--394, January 16, 2014
Johnson, Z. C., Schumer, R., Warwick, J. J. (2014). Factors affecting hyporheic and surface transient storage in a western U.S. river, Journal of Hydrology, 510, 325--339, doi: 10.1016/j.jhydrol.2013.12.037
Johnson, Z. C., Warwick, J. J., Schumer, R. (2014). Nitrogen retention in the main channel and two transient storage zones during nutrient addition experiments, Limnology and Oceanography, DOI:10.1002/lno.10006, doi: 10.1002/lno.10006
Pelosi, A., Parker, G., Schumer, R. (2014). Exner based Master Equation for transport and dispersion of river pebble tracers: derivation, asymptotic forms, and quantification of nonlocal vertical dispersion, Journal of Geophysical Research - Earth Surface, doi: 10.1002/2014JF003130
Schumer, R. (2014). Hydrologic Modeling II: Stochastic Processes, In Handbook of Engineering Hydrology, 646, CRC Press
Sturchio, N. C., Beloso, Jr., A., Heraty, L. J., Wheatcraft, S. W., Schumer, R. (2014). Isotopic tracing of perchlorate sources in groundwater from Pomona, Californ ia, Applied Geochemistry, doi: 10.1016/apgeochem.2014.01.012


Voepel, H. E., Schumer, R., Hassan, M. A. (2013). Sediment residence time distributions: theory and application from bed elevation measurements, Journal of Geophysical Research - Earth Surface, doi: 10.1002/jgrf.20151
Zhang, Y., Meerschaert, M. M., Baeumer, B., Schumer, R., LaBolle, E. M. (2013). TEST-RWHet-v1.0: A software suite using the tempered stable models to simulate preasymptotic pollutant transport in multi-dimensional natural media, Proceedings of MODFLOW and MORE 2013: Translating Science into Practice


Chen, L., Schumer, R., Forsee, W. J., Knust, A. M. (2012). Impact of Temporal Resolution of Flow-Duration curve on Sediment Load Estimation, Journal of the American Water Resources Association, 48, 145-155
Drummond, J. D., Covino, T. P., Aubeneau, A. F., Leong, D., Patil, S., Schumer, R., Packman, A. I. (2012). Effects of solute breakthrough curve tail truncation on residence time estimates: A synthesis of solute tracer injection studies, Journal of Geophysical Research, 117, doi: 10.1029/2012JG002019
Hassan, M. A., Voepel, H. E., Schumer, R., Parker, G., Fraccarollo, L. V. (2012). Displacement characteristics of coarse fluvial bed sediment, Journal of Geophysical Research - Earth Surface, doi: 10.1029/2012JF002374
Johnson, Z. C., Schumer, R., Warwick, J. J. (2012). Physical and biological N retention in two transient storage zones of the lower Truckee River, NV, H13D-1379, 2012 AGU Fall Meeting: San Francisco
Martin, R. L., Jerolmack, D. J., Schumer, R. (2012). The physical basis for anomalous diffusion in bedload transport, J. Geophys. Res, doi: 10.1029/2011JF002075.
Patil, S., Covino, T. P., Packman, A. I., Drummond, J. D., Payn, R., Schumer, R., McGlynn, B. (2012). Intra-stream variability in solute transport in rivers: Geomorphic controls on tailing behavior, Journal of Geophysical Research - Earth Surface, doi: 10.1029/2012JF002455
Schumer, R., Knust, A. M., Boyle, D. P. (2012). Characteristics of ephemeral hydrographs in the Southwestern United States, Journal of Hydrologic Engineering, doi: 10.1061/(ASCE)HE.1943-5584.0000643
Zhu, J., Forsee, W. J., Schumer, R., Gautam, M. (2012). Future projections and uncertainty asseessment of extreme rainfall intensity in the United States from an ensemble of climate models, Climatic Change, doi: 10.1007/s10584-012-0639-6


McGraw, D. S., Pohll, G. M., Schumer, R., Shanafield, M. (2011). Development of tools to estimate Truckee River conveyance losses, Hydrogeology Journal, doi: 10.1007/s10040-010-0701-2
Schumer, R., Jerolmack, D. J., McElroy, B. (2011). The stratigraphic filter and bias in measurement of geologic rates, Geophys. Res. Lett, doi: 10.1029/2011GL047118
Thompson, S. E., Harman, C. J., Schumer, R., Wilson, J. S., Basu, N. B., Brooks, P. D., Donner, S. D., Hassan, M. A., Packman, A. I., Rao, P. S., Troch, P. A., Sivapalan, M. (2011). Patterns, puzzles and people: implementing hydrologic synthesis, Hydrological Processes, doi: 10.1002/hyp.8234
Voepel, H. E., Ruddell, B., Schumer, R., Troch, P. A., Brooks, P., Neal, A., Durcik, M., Sivapalan, M. (2011). Quantifying the role of climate and landscape characteristics on hydrologic partitioning and vegetation response, Water Resources Research


Schumer, R., Baeumer, B., Meerschaert, M. (2010). Extremal behavior of a coupled continuous time random walk, Physica A, doi: 10.1016/j.physa.2010.10.018
Voepel, H. E., Schumer, R., Ruddell, B., Brooks, P. D., Troch, P., Neal, A., Durcik, M., Sivapalan, M. (2010). Hydrologic controls on catchment-scale vegetation productivity


Schumer, R., Baeumer, B., Meerschaert, M. M. (2009). Fractional advection-dispersion equations for modeling transport at the Earth surface, Journal of Geophysical Research, 114, doi: 10.1029/2008JF001246
Schumer, R., Jerolmack, D. J. (2009). Real and apparent changes in sediment deposition rates through time., Journal of Geophysical Research - Earth Surface, 114, doi: 10.1029/2009JF001266


Schumer, R., Benson, D. A., Meerschaert, M. M. (2007). Recurrence of extreme events with power law interarrival times, Geophysical Research Letters, 34, doi: 10.1029/2007GL030767


Schumer, R., Benson, D. A., Meerschaert, M. M., Baeumer, B. (2003). Multiscaling fractional advection-dispersion equations and their solutions, Water Resources Research, 39, doi: 10.1029/2001WR001229
Schumer, R., Benson, D. A., Meerschaert, M. M., Baeumer, B. (2003). Fractal mobile/immobile solute transport, Water Resources Research, 39, 10


Benson, D. A., Schumer, R., Wheatcraft, S. W., Meerschaert, M. M. (2001). Fractional dispersion, Levy motion, and the MADE tracer tests, Transport in Porous Media, 42, 211-240
Schumer, R., Benson, D. A., Meerschaert, M. M., Wheatcraft, S. W. (2001). Eulerian derivation of the fractional advection-dispersion equation, Journal of Contaminant Hydrology, 48, 69-88



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