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Title: Implications of water management representations for watershed hydrologic modeling in the Yakima River basin

Journal Article · · Hydrology and Earth System Sciences (Online)

Water management substantially alters natural regimes of streamflow through modifying retention time and water exchanges among different components of the terrestrial water cycle. Accurate simulation of water cycling in intensively managed watersheds, such as the Yakima River Basin (YRB) in the Pacific Northwest of the U.S., faces challenges in reliably characterizing influences of management practices (e.g., reservoir operation and cropland irrigation) on the watershed hydrology. Using the Soil and Water Assessment Tool (SWAT) model, we evaluated streamflow simulations in the YRB based on different reservoir operation and irrigation schemes. Simulated streamflow with the reservoir operation scheme optimized by the RiverWare model better reproduced measured streamflow than the simulation using default SWAT reservoir operation scheme. Scenarios with irrigation practices demonstrated higher water losses through evapotranspiration (ET), and matched benchmark data better than the scenario that only considered reservoir operations. Results of this study highlight the importance of reliably representing reservoir operations and irrigation management for credible modeling of watershed hydrology. Incorporating improved reservoir operation schemes and local irrigation information into SWAT holds the promise to further enhance its capability for hydrologic modeling in managed watersheds.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1496828
Report Number(s):
PNNL-SA-135306
Journal Information:
Hydrology and Earth System Sciences (Online), Vol. 23, Issue 1; ISSN 1607-7938
Publisher:
European Geosciences Union (EGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Figures / Tables (13)