Ryan A McManamay

Ryan A McManamay

Team Lead, Integrated Water-Energy-Ecosystems


Dr. Ryan McManamay is the leader of the Integrated Water-Energy-Ecosystems Team within the Aquatic Ecology Group and the Energy-Water Nexus theme lead of the Urban Dynamics Institute at ORNL.  He is also and a joint faculty member of the Bredesen Center for Interdisciplinary Research and Graduate Education at the University of Tennessee-Knoxville. The scope of his research has encompassed multiple aspects of fish community ecology, statistical hydrology, large-scale spatial analysis, restoration ecology, ecohydrology, urban dynamics, and conservation planning. His main research thrusts have been evaluating fish community responses to altered hydrology in streams and national-scale hydrologic applications, and how to incorporate these findings into broader frameworks to influence water policies. Working within the Urban Dynamics Institute, Ryan has developed tools to optimize sustainable urban growth scenarios by minimizing impacts to aquatic ecosystems. He has also researched mitigation and conservation planning strategies for energy development on aquatic resources and consistently developed and disseminated large spatial datasets to guide future research. Prior to becoming a staff member in 2013, Ryan was a post-doc at ORNL for 2 years. He received his Ph.D. in Fish and Wildlife Conservation in 2011 and his M.S. in Stream Ecology in 2007, both at Virginia Tech. His undergraduate was at Clemson University where he received his B.S. in Biological Sciences in 2004.


Journal Publications and Book Chapters:

Troia, M.J., R.A. McManamay. (pending acceptance with revisions). Completeness and coverage of open-access freshwater fish distribution data in the United States. Diversity and Distributions

Vanni, M., P.B. McIntyre, et al. (66 authors, R.A. McManamay 42nd author). In press. A global database of nitrogen and phosphorus excretion rates of aquatic animals. Ecology DOI: 10.1002/ecy.1792

Morton, A., N. Nagle, J. Piburn, R. N. Stewart, and R. McManamay. 2017. A hybrid dasymetric and machine learning approach to high-resolution residential electricity consumption modeling in Griffith, D.A., C. Yongwan, D.J. Dean (eds). Advances in Geocomputation: Geocomputation 2015--The 13th International Conference. Springer, pp. 47-58. DOI: 10.1007/978-3-319-22786-3_5

Buchanan, B., D. Auerbach, R.A. McManamay, J. Taylor, A. Flecker, J. Archibald, D. Fuka, M. Walter. 2017. Environmental flows in the context of unconventional natural gas development in the Marcellus Shale.  Ecological Applications 27: 37–55.

Pracheil, B.M., R.A. McManamay, M.S. Bevelhimer, C.R. DeRolph, G.F. Cada. (In press) A Traits-based approach for prioritizing species for monitoring and surrogacy selection. Endangered Species Research 31: 243–258.

McManamay, R.A., S.K. Brewer, H. Jager, M. Troia. 2016. Organizing environmental flow frameworks to meet US Hydropower mitigation needs. Environmental Management 58: 365-385.

Brewer, S.K., R.A. McManamay, A.D. Miller, R. Mollenhauer, T.A. Worthington, T. Arsuffi. 2016. Advancing environmental flow science: developing frameworks for altered landscapes and integrating efforts across disciplines. Environmental Management DOI 10.1007/s00267-016-0703-5

Troia, MJ, R.A. McManamay. 2016. Filling in the Gaps: characterizing spatial, environmental, and temporal coverage of open-access biodiversity data. Ecology and Evolution DOI: 10.1002/ece3.2225

McManamay, R.A., R.T. Jett, M.G. Ryon, S.M. Gregory, S.H. Stratton, M.J. Peterson, 2016.  Dispersal limitations on fish community recovery following long-term water quality remediation. Hydrobiologia DOI: 10.1007/s10750-015-2612-7

McManamay, R.A., C. Oigbokie, S-C. Kao, M.S. Bevelhimer. 2016. A classification of US hydropower dams by their modes of operation.  River Research and Applications DOI: 10.1002/rra.3004

Auerbach, D.A., B.P. Buchanan, A.V. Alexiades, E.P. Anderson, A.C. Encalada, E.I. Larson, R.A. McManamay, G.L. Poe, M.T. Walter, A.S. Flecker. 2016. Towards catchment classification in data-scarce regions. Ecohydrology DOI: 10.1002/eco.1721.

McManamay, R.A., B.K. Peoples, D.J. Orth, C.A. Dolloff, and D.C. Matthews. 2015. Isolating causal pathways between flow and fish in the regulated river hierarchy. Canadian Journal of Fisheries and Aquatic Sciences 72: 1731-1748.

McManamay, R.A., and E.A. Frimpong. 2015.  Hydrologic filtering of fish life history strategies across the US: Implications of streamflow alteration on fish assemblages. Ecological Applications 25: 243-263. http://dx.doi.org/10.1890/14-0247.1

McManamay, R.A., N. Samu, S-C. Kao, M.S. Bevelhimer, and S.C. Hetrick. 2015. A multi-scale spatial approach to address environmental effects of small hydropower development. Environmental Management 55: 217-243. 

McManamay, R.A., M.S. Bevelhimer, E.A. Frimpong. 2015. Associations among hydrologic classifications and fish traits to support environmental flow standards. Ecohydrology 8, 460–479

McManamay, R.A., M.S. Bevelhimer. 2014. Sustainable solutions to benefit fisheries and hydropower at a basin scale in B. Beard (ed.) Québec City Meeting Wrap Up. Fisheries 39(12): 602.

McManamay, R.A., R.M. Utz. 2014. Open-access databases as unprecedented resources and drivers of cultural change in fisheries science. Fisheries 39: 417-425.

McManamay, R.A. 2014. Quantifying and Generalizing Hydrologic Responses to Dam Regulation using a Statistical Modeling Approach. Journal of Hydrology 519: 1278-1296.

Bevelhimer, M.S., R.A. McManamay, B. O’Conner. 2014. Characterizing sub-daily flow regimes: implications of hydrologic resolution on ecohydrology studies.  River Research and Applications DOI: 10.1002/rra.2781

Jager, H.I., and R.A. McManamay. 2014. Comment on ‘‘Cumulative biophysical impact of small and large hydropower development in Nu River, China’’ by Kelly Kibler and Desiree Tullos. Water Resources Research 49: 1–2.

McManamay, R.A., D.J. Orth, H.I. Jager. 2014. Accounting for variation in species detection in fish community monitoring.  Fisheries Management and Ecology 21: 96–112.

McManamay, R.A., M.S. Bevelhimer, S. Kao. 2014. Updating the US hydrologic classification: an approach to clustering and stratifying ecohydrologic data. Ecohydrology 7: 903–926

McManamay, R.A., D.J. Orth, C.A. Dolloff. 2013.  Macroinvertebrate community responses to gravel augmentation in a Southeastern regulated river. Southeastern Naturalist 12: 599-618.

Peoples, B.K., R.A. McManamay, D.J. Orth, E.A. Frimpong. 2013. Nesting habitat use by river chubs in a hydrologically variable Appalachian tailwater. Ecology of Freshwater Fish DOI: 10.1111/eff.12078

McManamay, R.A., D.J. Orth, C.A. Dolloff. 2013.  Case Study: Application of the ELOHA framework to regulated rivers in the Upper Tennessee River basin. Environmental Management 51:1210–1235.

McManamay, R.A., D.J. Orth, J. Kauffman, M.D. Davis. 2013.  A database and meta-analysis of ecological responses to flow in the South Atlantic Region. Southeastern Naturalist 12 (Monograph 5): 1-36.

McManamay, R.A., J.T. Young, D.J. Orth. 2012. Spawning of white sucker (Catostomus Commersoni) in a stormwater pond inlet.  American Midland Naturalist 168: 466-476.

McManamay, R.A., D.J. Orth, C.A. Dolloff. 2012.  Revisiting the homogenization of dammed rivers in the Southeastern US. Journal of Hydrology 424-425: 217-237.

McManamay, R. A., D. J. Orth, C. A. Dolloff, and E. A. Frimpong.  2012.  Regional frameworks applied to hydrology: can landscape-based frameworks capture the hydrologic variability?  River Research and Applications 28: 1325-1339.  

McManamay, R. A., D. J. Orth, C. A. Dolloff, and E. A. Frimpong.  2012.  A regional classification of unregulated streamflows: spatial resolution and hierarchical frameworks.  River Research and Applications 28: 1019–1033. 

McManamay, R.A., J.R. Webster, H.M. Valett, C.A. Dolloff.  2011.  Does diet influence consumer nutrient cycling?  Macroinvertebrate and fish excretion in streams.  Journal of the North American Benthological Society 30: 84-102.

McManamay, R.H., L.M. Resler, J.B. Campbell, and R.A. McManamay. 2011. Assessing the impact of balsam woolly adelgid (Adelges piceae Ratz.) and anthropogenic disturbance on the stand structure and mortality of Fraser fir (Abies fraseri (Pursh) Poir.) in the Black Mountains of North Carolina. Castanea 76: 1-19.

McManamay, R. A., D. J. Orth, C. A. Dolloff, and M. A. Cantrell.  2010.  Gravel addition as a habitat     restoration technique for tailwaters.   North American Journal of Fisheries Management 30:1238-1257.


Peer-Reviewed Proceedings:

Morton, A.M., N.N. Nagle, J.O. Piburn, R.N. Stewart. R.A. McManamay. 2017. A High-Resolution Spatially-Explicit Statistical Framework for Estimating Residential Electricity Consumption. Proceedings of the 2017 Grace Hopper Celebration of Women in Computing. Orlando, FL. October 4, 2017.

Morton, A.M., J.O. Piburn, R.A. McManamay, N.N. Nagle, R.N. Stewart. 2016. A Dasymetric-Based Monte Carlo Simulation Approach to the Probabilistic Analysis of Spatial Variables. GIScience 2016 Proceedings. Montreal, Canada. September 27, 2016.

Hecht, J.S., R.A. McManamay, R.M. Vogel. 2015. Testing Hypotheses of Hydropower-Induced Hydrologic Alteration beyond Ecological Thresholds. Hydrovision International 2015 Annual Meeting Proceedings. Portland, OR. July 14-17, 2015. Available at: http://s36.a2zinc.net/clients/pennwell/HVI2015/Custom/Handout/Speaker53379_Session11881_1.pdf

Morton, A., N. Nagle, J. Piburn, R.N. Stewart, R.A. McManamay. 2015. A hybrid dasymetric and machine learning approach to high-resolution residential electricity consumption modeling. Proceedings of the 13th International Conference on GeoComputation. Dallas, TX. p286-291. http://www.geocomputation.org/2015/index.html

Johnson G.E., M.S. Bevelhimer, K.B. Larson, J.D. Tagestad, J.W. Saulsbury, R.A. McManamay, C.A. Duberstein, C.R. DeRolph, S.L. Hetrick, B.T. Smith, S.H. Geerlof. 2014. The Basin-Scale Opportunity Assessment Initiative: Synopsis of the Preliminary Scoping Assessments for the Connecticut and Roanoke River Basins. Hydrovision International 2014 Annual Meeting Proceedings. Nashville, Tn. July 22-25, 2014. Available at: http://s36.a2zinc.net/clients/pennwell/HVI2014/Public/SessionDetails.asp...

Bevelhimer, M.S, and R. A. McManamay. 2012. Minimizing the environmental impact of variable flow regimes while maintaining the value of hydropower peaking. Hydrovision International 2012 Annual Meeting Proceedings. Louisville, KY. July, 2012. Available at: http://s36.a2zinc.net/clients/pennwell/HVI2012/Custom/Handout/Speaker9395_Session2511_1.pdf


Technical Reports:

Smith, B.T. et al. (22 authors, R.A. McManamay 22th author). 2016. A multi-year plan for research, development, and prototype testing of standard modular hydropower technology. Oak Ridge National Laboratory, ORNL/TM-2016/102. November 2016.

Hydropower Vision: A new chapter for American’s 1st renewable electricity source. (300 authors). 2016. US Department of Energy. http://energy.gov/eere/water/new-vision-united-states-hydropower 

Peterson, M.J., M.S. Greeley, R.T. Jett, T.J. Mathews, J.G. Smith, R.A. McManamay. 2016. Y-12 National Security Complex Biological Monitoring and Abatement Program 2015 Calendar Year Report. Oak Ridge National Laboratory. ORNL/TM-2016/200. September 2016.

Witt, A.M., B.T. Smith, A.Tsakiris, et al. (R.A. McManamay 12th author). 2016. Exemplary Design Envelope Specification for Standard Modular Hydropower Technology. Oak Ridge National Laboratory. ORNL/TM-2016/298. July 2016

McManamay, R.A., M.J. Troia, C.R. DeRolph, N.M. Samu. 2016. Stream Classification Tool User Manual: For Use in Applications in Hydropower-related environmental mitigation. Oak Ridge National Laboratory ORNL/TM-2015/670. January 2016.

Buchanan, B., R.A. McManamay, D. Auerbach, D. Fuka, M.T. Walter. 2015. Environmental Flow Analysis for the Marcellus Shale Region: A technical report submitted to the Appalachian Landscape Conservation Cooperative in completion of grant# 2012-03.  Final Report. August 2015. DOI: 10.13140/RG.2.1.4328.9687

McManamay, R.A., M.J. Troia, C.R. DeRolph, M.S. Bevelhimer, M. P. Schramm, K.B. Larson, J.D. Tagestad, G.E. Johnson, H.I. Jager. 2015. Identifying Environmental Opportunities outside the Hydropower Project Boundary: An Updated Methodology of the Basin Scale Opportunity Assessment. ORNL TM-2014-540. January 2015.

Larson, K.B., G.E. Johnson, J.D. Tagestad, C.A. Duberstein, M.S. Bevelhimer, R.A. McManamay, C.R. DeRolph, and S.H. Geerlofs. 2014. The Integrated Basin-Scale Opportunity Assessment Initiative: Scoping Assessment for the Connecticut River Basin. Final Report. Pacific Northwest National Laboratory Report PNNL-23778. October 2014.

Olivero Sheldon, A., R.A. McManamay. 2014. Literature review of freshwater classification frameworks. Prepared for the Appalachian LCC as part of the Grant, “A Stream Classification System for the Appalachian Landscape Conservation Cooperative.” May 2014.                              

Kao, S.-C., R. A. McManamay, K. M. Stewart, N. M. Samu, B. Hadjerioua, S. T. DeNeale, D. Yeasmin, M. F. K. Pasha, A. A. Oubeidillah, and B. T. Smith. 2014.  New Stream-reach Development: A Comprehensive Assessment of Hydropower Energy Potential in the United States, GPO DOE/EE-1063, Wind and Water Power Program, Department of Energy, Washington, DC.

Jager, H.I., B.A. Elrod, N.Samu, R.A. McManamay, and B.T. Smith. 2013. ESA Protection for the American Eel: Implications for U.S. Hydropower. Oak Ridge National Laboratory. ORNL/TM-2013/361. November 2013.

McManamay, R.A., P.W. Bonsall, S.C. Hetrick, J.Harn, J. Duncan, and B.T. Smith. 2013. Digital mapping and environmental characterization of National Wild and Scenic River Systems. Oak Ridge National Laboratory 2013 Final Report. ORNL/TM-2013/356.  September 2013.

Johnson G.E., M.S. Bevelhimer, K.B. Larson, J.D. Tagestad, J.W. Saulsbury, R.A. McManamay, C.A. Duberstein, C.R. DeRolph, S.L. Hetrick, B.T. Smith, and S.H. Geerlofs. 2013. The Integrated Basin Scale Opportunity Assessment Initiative: Phase 1 methodology and preliminary scoping assessments for the Connecticut River and Roanoke River Basins. Pacific Northwest National Laboratory Annual Report 2013. PNNL 22807.  September 2013.

McManamay, R.A., and M.S. Bevelhimer. 2013. A holistic framework for environmental flows determination in hydropower contexts. Oak Ridge National Laboratory, 2013 Project Report. ORNL/TM-2013/159.  April 2013.

Vernon, C.R., E.V. Arntzen, M.C. Richmond, R.A. McManamay, T.P. Hanrahan C.L. Rakowski. 2013. GIS Framework for Large River Classification to Aid in the Evaluation of Flow-Ecology Relationships. Pacific Northwest National Laboratory Report PNNL-22296. February 2013.

Hadjerioua, B., S-C Kao*, R.A. McManamay, M.D. Fayzul, K. Pasha, D. Yeasmin, A.A. Oubeidillah, N.M. Samu, K.M. Stewart, M.S. Bevelhimer, S.L. Hetrick, Y. Wei, and B.T. Smith. 2012. An assessment of energy potential from new small hydro development in the United States. Initial Report on Methodology.  Report by Oak Ridge National Laboratory to the Department of Energy. August, 2012.  http://nhaap.ornl.gov/sites/default/files/NSD_Methodology_Report.pdf

McManamay, R.A., D.J. Orth, J. Kauffman. 2011.  Ecological responses to flow alteration in the South Atlantic Region: A literature review and meta-analysis. Report to the Southeastern Aquatic Resources Partnership. November 2011.  Available at: http://filebox.vt.edu/users/dorth/