A unified approach for process-based hydrologic modeling: 1. Modeling concept
Date
2015
Authors
Clark, M.
Nijssen, B.
Lundquist, J.
Kavetski, D.
Rupp, D.
Woods, R.
Freer, J.
Gutmann, E.
Wood, A.
Brekke, L.
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Advisors
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Volume Title
Type:
Journal article
Citation
Water Resources Research, 2015; 51(4):2498-2514
Statement of Responsibility
Martyn P. Clark, Bart Nijssen, Jessica D. Lundquist, Dmitri Kavetski, David E. Rupp, Ross A. Woods, Jim E. Freer, Ethan D. Gutmann, Andrew W. Wood, Levi D. Brekke, Jeffrey R. Arnold, David J. Gochis and Roy M. Rasmussen
Conference Name
Abstract
This work advances a unified approach to process-based hydrologic modeling to enable con- trolled and systematic evaluation of multiple model representations (hypotheses) of hydrologic processes and scaling behavior. Our approach, which we term the Structure for Unifying Multiple Modeling Alternatives (SUMMA), formulates a general set of conservation equations, providing the flexibility to experiment with different spatial representations, different flux parameterizations, different model parameter values, and different time stepping schemes. In this paper, we introduce the general approach used in SUMMA, detailing the spatial organization and model simplifications, and how different representations of multiple physical processes can be combined within a single modeling framework. We discuss how SUMMA can be used to systematically pursue the method of multiple working hypotheses in hydrology. In particular, we discuss how SUMMA can help tackle major hydrologic modeling challenges, including defining the appropriate complexity of a model, selecting among competing flux parameterizations, representing spatial variability across a hierarchy of scales, identifying potential improvements in computational efficiency and numerical accuracy as part of the numerical solver, and improving understanding of the various sources of model uncertainty.
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© 2015. American Geophysical Union. All Rights Reserved.