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Integrating Water Supply Constraints into Irrigated Agricultural Simulations of CaliforniaSimulations of irrigated croplands generally lack key interactions between water demand from plants and water supply from irrigation systems. We coupled the Water Evaluation and Planning system (WEAP) and Decision Support System for Agrotechnology Transfer (DSSAT) to link regional water supplies and management with field-level water demand and crop growth. WEAP-DSSAT was deployed and evaluated over Yolo County in California for corn, rice, and wheat. WEAP-DSSAT is able to reproduce the results of DSSAT under well-watered conditions and reasonably simulate observed mean yields, but has difficulty capturing yield interannual variability. Constraining irrigation supply to surface water alone reduces yields for all three crops during the 1987-1992 drought. Corn yields are reduced proportionally with water allocation, rice yield reductions are more binary based on sufficient water for flooding, and wheat yields are least sensitive to irrigation constraints as winter wheat is grown during the wet season.
Document ID
20170007355
Document Type
Reprint (Version printed in journal)
Authors
Winter, Jonathan M. (Dartmouth Coll. Hanover, NH, United States)
Young, Charles A. (Stockholm Environment Inst. Davis, CA, United States)
Mehta, Vishal K. (Stockholm Environment Inst. Davis, CA, United States)
Ruane, Alex C. (NASA Goddard Inst. for Space Studies New York, NY United States)
Azarderakhsh, Marzieh (Fairleigh Dickinson Univ. Teaneck, NJ, United States)
Davitt, Aaron (City Univ. of New York New York, NY, United States)
McDonald, Kyle (City Univ. of New York New York, NY, United States)
Haden, Van R. (Ohio State Univ. Wooster, OH, United States)
Rosenzweig, Cynthia E. (NASA Goddard Inst. for Space Studies New York, NY United States)
Date Acquired
August 3, 2017
Publication Date
July 18, 2017
Publication Information
Publication: Environmental Modelling & Software
Volume: 96
ISSN: 1364-8152
Subject Category
Earth Resources and Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN44917
Distribution Limits
Public
Copyright
Other
Keywords
Agriculture; Irrigation; Water Resources Management; Crop Model; Evapotranspirat