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|Title:||A unified approach for process-based hydrologic modeling: 2. Model implementation and case studies|
|Citation:||Water Resources Research, 2015; 51(4):2515-2542|
|Publisher:||American Geophysical Union (AGU)|
|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, David J. Gochis, Roy M. Rasmussen, David G. Tarboton, Vinod Mahat, Gerald N. Flerchinger and Danny G. Marks|
|Abstract:||This work advances a uniﬁed approach to process-based hydrologic modeling, which we term the ‘‘Structure for Unifying Multiple Modeling Alternatives (SUMMA).’’ The modeling framework, introduced in the companion paper, uses a general set of conservation equations with ﬂexibility in the choice of process parameterizations (closure relationships) and spatial architecture. This second paper speciﬁes the model equations and their spatial approximations, describes the hydrologic and biophysical process parameterizations currently supported within the framework, and illustrates how the framework can be used in conjunction with multivariate observations to identify model improvements and future research and data needs. The case studies illustrate the use of SUMMA to select among competing modeling approaches based on both observed data and theoretical considerations. Speciﬁc examples of preferable modeling approaches include the use of physiological methods to estimate stomatal resistance, careful speciﬁcation of the shape of the within-canopy and below-canopy wind proﬁle, explicitly accounting for dust concentrations within the snowpack, and explicitly representing distributed lateral ﬂow processes. Results also demonstrate that changes in parameter values can make as much or more difference to the model predictions than changes in the process representation. This emphasizes that improvements in model ﬁdelity require a sagacious choice of both process parameterizations and model parameters. In conclusion, we envisage that SUMMA can facilitate ongoing model development efforts, the diagnosis and correction of model structural errors, and improved characterization of model uncertainty.|
|Rights:||© 2015. American Geophysical Union. All Rights Reserved.|
|Appears in Collections:||Aurora harvest 7|
Civil and Environmental Engineering publications
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