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Water 2018, 10(3), 274;

Separating Wet and Dry Years to Improve Calibration of SWAT in Barrett Watershed, Southern California

College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China
Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters, Fujian Normal University, Fuzhou 350007, China
State Key Laboratory of Subtropical Mountain Ecology (Funded by Ministry of Science and Technology and Fujian Province), Fujian Normal University, Fuzhou 350007, China
Department of Geography, San Diego State University, San Diego, CA 92182-4493, USA
Dorset Environmental Science Center, Ontario Ministry of Environment and Climate Change, 1026 Bellwood Acres Road, Dorset, ON P0A 1E0, Canada
Author to whom correspondence should be addressed.
Received: 20 January 2018 / Revised: 16 February 2018 / Accepted: 26 February 2018 / Published: 5 March 2018
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Hydrological models often perform poorly in simulating dry years in regions with large inter-annual variability in rainfall. We calibrated the Soil and Water Assessment Tool (SWAT) model to dry and wet years separately, using the semi-arid Barrett watershed on the west coast of USA as an example. We used hydrological and meteorological data from 1980–2010 to calibrate the SWAT model parameters, compared the monthly runoff results simulated by SWAT using a traditional calibration for the entire runoff series with results using a calibration with the wet and dry year series, and analyzed differences in the most sensitive parameters between the wet and dry year series. The results showed that (1) the SWAT model calibrated to the entire runoff series produced significant differences in simulation efficiency between the wet years and dry years, with lower efficiency during the dry years; (2) the calibration with separate wet and dry years greatly enhanced the SWAT model’s simulation efficiency for both wet and dry years; (3) differences in hydrological conditions between wet and dry years were represented by changes in the values of the six most sensitive parameters, including baseflow recession rates, channel infiltration rates, Soil Conservation Service (SCS) curve number, soil evaporation, shallow aquifer flow, and soil water holding capacity. Future work can attempt to determine the physical processes that underlie these parameter changes and their impact on the hydrological response of the semi-arid watersheds. View Full-Text
Keywords: runoff; dry year; parameter; calibration; SWAT; Barrett watershed runoff; dry year; parameter; calibration; SWAT; Barrett watershed

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Gao, X.; Chen, X.; Biggs, T.W.; Yao, H. Separating Wet and Dry Years to Improve Calibration of SWAT in Barrett Watershed, Southern California. Water 2018, 10, 274.

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