Towards simplification of hydrologic modeling: Identification of dominant processes

Hydrology and Earth System Sciences
By: , and 



The Precipitation–Runoff Modeling System (PRMS), a distributed-parameter hydrologic model, has been applied to the conterminous US (CONUS). Parameter sensitivity analysis was used to identify: (1) the sensitive input parameters and (2) particular model output variables that could be associated with the dominant hydrologic process(es). Sensitivity values of 35 PRMS calibration parameters were computed using the Fourier amplitude sensitivity test procedure on 110 000 independent hydrologically based spatial modeling units covering the CONUS and then summarized to process (snowmelt, surface runoff, infiltration, soil moisture, evapotranspiration, interflow, baseflow, and runoff) and model performance statistic (mean, coefficient of variation, and autoregressive lag 1). Identified parameters and processes provide insight into model performance at the location of each unit and allow the modeler to identify the most dominant process on the basis of which processes are associated with the most sensitive parameters.

The results of this study indicate that: (1) the choice of performance statistic and output variables has a strong influence on parameter sensitivity, (2) the apparent model complexity to the modeler can be reduced by focusing on those processes that are associated with sensitive parameters and disregarding those that are not, (3) different processes require different numbers of parameters for simulation, and (4) some sensitive parameters influence only one hydrologic process, while others may influence many

Publication type Article
Publication Subtype Journal Article
Title Towards simplification of hydrologic modeling: Identification of dominant processes
Series title Hydrology and Earth System Sciences
DOI 10.5194/hess-20-4655-2016
Volume 20
Year Published 2016
Language English
Publisher Europen Geosciences Union
Contributing office(s) National Research Program - Central Branch
Description 17 p.
First page 4655
Last page 4671
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