SUMMA is a hydrologic modeling approach that is built on a common set of conservation equations and a common numerical solver, which together constitute the structural core of the model. Different modeling approaches can then be implemented within the structural core, enabling a controlled and systematic analysis of alternative modeling options, and providing insight for future model development.

Model Development Team

NCAR: Martyn Clark (PI), Grey Nearing, Andy Newman, Naoki Mizukami, Nans Addor, Andy Wood, Ethan Gutmann

University of Washington: Bart Nijssen, Jessica Lundquist, Michael Ou

U.S. Army Corps of Engineers: Jeff Arnold

Bureau of Reclamation: Levi Brekke

Contact: Martyn Clark - mclark@ucar.edu | Julie Vano – jvano@ucar.edu

Sponsors

National Science Foundation, U.S. Army Corps of Engineers, Bureau of Reclamation

More Information At

 

Project information:   hydrologic_modeling

Model homepage:   https://www.ral.ucar.edu/projects/summa

Papers:

Clark, M.P., B. Schaefli, S. Schymanski, L. Samaniego, C. Luce, B. Jackson, J. Freer, J.R. Arnold, D. Moore, E. Istanbulluoglu, and S. Ceola, 2016: Improving the theoretical underpinnings of process-based hydrologic models. Water Resources Research, 52, doi:10.1002/2015WR017910

 

Clark, M.P., B. Nijssen, J.D. Lundquist, D. Kavetski, D.E. Rupp, R.A. Woods, J.E. Freer, E.D. Gutmann, A.W. Wood, D.J. Gochis, R.M. Rasmussen, D.G. Tarboton, V. Mahat, G.N. Flerchinger, and D.G. Marks, 2015: A unified approach for process-based hydrologic modeling: 2. Model implementation and case studies. Water Resources Research, 51, 2515-2542, doi:10.1002/2015wr017200

 

Clark, M.P., B. Nijssen, J.D. Lundquist, D. Kavetski, D.E. Rupp, R.A. Woods, J.E. Freer, E.D. Gutmann, A.W. Wood, L.D. Brekke, J.R. Arnold, D.J. Gochis, and R.M. Rasmussen, 2015: A unified approach to process-based hydrologic modeling. Part 1: Modeling concept. Water Resources Research, 51, 2498–2514, doi:10.1002/2015WR017198

 

Newman,A.J., M.P. Clark, A. Winstral, D. Marks, and M. Seyfried, 2014: The use of similarity concepts to represent sub-grid varibility in hydrologic an land-surface models: Case study in a snowmelt dominated watershed. Journal of Hydrometeorology, 15, 1717-1738, doi:10.1175/JHM-D-13-038.1