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SUMMA 2.0.0

Authors: Martyn Clark · Bart Nijssen
Owners: Jonathan Goodall
Resource type:Model Program Resource
Created:Dec 11, 2017 at 2:56 a.m.
Last updated: Dec 11, 2017 at 3:02 a.m. by Jonathan Goodall


SUMMA (Clark et al., 2015a;b;c) is a hydrologic modeling framework that can be used for the systematic analysis of alternative model conceptualizations with respect to flux parameterizations, spatial configurations, and numerical solution techniques. It can be used to configure a wide range of hydrological model alternatives and we anticipate that systematic model analysis will help researchers and practitioners understand reasons for inter-model differences in model behavior. When applied across a large sample of catchments, SUMMA may provide insights in the dominance of different physical processes and regional variability in the suitability of different modeling approaches. An important application of SUMMA is selecting specific physics options to reproduce the behavior of existing models – these applications of "model mimicry" can be used to define reference (benchmark) cases in structured model comparison experiments, and can help diagnose weaknesses of individual models in different hydroclimatic regimes.

SUMMA 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.

The important modeling features are:

The formulation of the conservation model equations is cleanly separated from their numerical solution;

Different model representations of physical processes (in particular, different flux parameterizations) can be used within a common set of conservation equations; and

The physical processes can be organized in different spatial configurations, including model elements of different shape and connectivity (e.g., nested multi-scale grids and HRUs).

Subject Keywords


How to cite

Clark, M., B. Nijssen (2017). SUMMA 2.0.0, HydroShare, http://www.hydroshare.org/resource/5d5da76611d64b7a8105fadbc5ac7828

This resource is shared under the Creative Commons Attribution CC BY.


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    The people or organizations that created the intellectual content of the resource.

    Name Organization Address Phone Author Identifiers
    Martyn Clark NCAR
    Bart Nijssen University of Washington
    Content files
    Computational Engine

    Software Repository https://github.com/NCAR/summa
    Release Date 05/30/2017
    Version 2.0.0
    Website http://www.ral.ucar.edu/projects/summa


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