Jim Brock

Affiliate Associate Research Scientist

Professional Interests

Jim Brock delivers a bucketful of calibrated water monitoring sondes to groundwater discharge methods comparison field site at Perth, Australia

My research focuses on the structure and dynamics of aquatic ecosystems, primarily streams and rivers in arid lands. I study temperature dynamics, material transport, nutrient assimilation, hydrology, and the factors affecting metabolic processes of aquatic ecosystems. I led a team of scientists and engineers who developed numeric models that simulate water quality in rivers where periphyton dominates the oxygen and nutrient dynamics. Although most of my past research has focused on flowing surface waters, my scope of interest lately has been broadening to include riparian, wetland, estuarine, and shallow groundwater environments. I often design and assemble novel instrumentation to support measurements of ecological and hydrological processes. These research instruments, for example, enable monitoring of surface water-groundwater exchange, groundwater flow, and measuring aquatic community metabolism and nutrient dynamics in flowing mesocosms. I currently am involved in integrating field instruments with software tools to facilitate research at remote sites using web-based data collection and graphical display.

Research Areas

  • Ecosystems
  • Freshwater Ecology
  • Biogeochemistry
  • River Hydrodynamics
  • Riparian-stream Channel and Hyporheic Interactions
  • Modeling of Lotic Ecosystems and Temperature
  • Environmental Monitoring Instrument Development
  • Thermal Dynamics in Streams
Measuring oxygen metabolism of periphyton on sticks,  Kissimmee  River, FL.
Measuring oxygen metabolism of periphyton on sticks, Kissimmee River, FL.

Recent Research Projects

Current Projects

  • Influence of groundwater-surface water exchange on periphyton dynamics
  • Thermal Influences on Periphyton Dynamics
  • Thermal Survey of Carson and Truckee Rivers
  • Simulated Effects of Decreased Discharge on Water Temperature of Warm Springs Ck, NV
  • Development of a Profiling Temperature Probe
  • Groundwater Influences on Aquatic Plants of Lake Tahoe - Download PDF


M.S. 1980 Idaho State University Zoology
B.S. 1973 Amherst College Biology

Publications & Presentations


Brock, J. T., Hire, D., Fitzgerald, B. C., Susfalk, R. B. (2016). Hydrologic Monitoring for the S-356 Pump Station Test (Miami-Dade County, Florida) 2015 - 2016, Annual Report USACE Contract No. W912EP-15-R-0024, August 2016.


Cobourn, J., Saito, L., Brock, J. T., Naranjo, R. C., Susfalk, R. B., Chandra, S. (2008). Groundwater-Surface Water Interactions Along the Truckee and Carson Rivers, University of Nevada Cooperative Extension Publication
Naranjo, R. C., Brock, J. T., Susfalk, R. B., Mckay, A., Stone, M. C., Saito, L., Tyler, S. W. (2008). Nutrient and Hyporheic flow Dynamics Through a Riffle-Pool Sequence, Truckee River at Fleish, CA, Nevada Water Resources Association 2008 Annual Conference.
Naranjo, R. C., Stone, M. C., Mckay, A., Brock, J. T., Davis, C. J. (2008). Data Collection for Investigating Hyporheic Flow and Nutrient Exchange in the Truckee River, AGU Fall Meeting: San Francisco, CA


Sada, D. W., Brock, J. T., Fritsen, C. H., Rosamond, C. L., Shope, C., Benner, S. G., McKay, W. A. (2005). Baseline Hydrologic and Biological Monitoring, McCarran Ranch Restoration Project, Lower Truckee River, Nevada (2003-2004), DRI Report No. 41220
Shope, C., Brock, J. T., Benner, S. G., McKay, W. A., Svetich, T., Brisbin, M. (2005). Baseline hydraulic relationship and water quality of the McCarran Ranch restoration
Shope, C., Cooper, C. A., Brock, J. T., Benson, D. A. (2005). Hyporheic exchange within a channel bar as a regulator of periphyton dynamics


Shope, C., Benner, S. G., Brock, J. T., Sada, D. W., Fritsen, C. H. (2004). Influence of temporal and spatial river temperature heterogeneity on nutrient cycling


Dana, G. L., Brock, J. T. (2002). Influence of riparian vegetation on local climate and river temperature.



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