Irrigation and Drainage

Oral

397246 - A comparative study of evapotranspiration estimation in the California Bay Delta: Insights from a two-year study using remote sensing, field measurements and unmanned aerial vehicles

Tuesday, June 5
4:00 PM - 5:30 PM
Location: Skyway Room
Co-Authors: Jesse Jankowski, Davis< California – University of California, Davis; Andrew Bell, Davis, California – University of California, Davis; Kyaw Tha Paw U, Davis, California – University of California, Davis; Yufang Jin, Davis, California – University of California, Davis; Eric Kent, Davis, California – University of California, Davis; Jenae Clay, Davis, California – University of California, Davis; NIcholas Santos, Davis, California – University of California, Davis; Jay Lund, Davis, California – University of California, Davis; Nadya Alexander, Davis, CA – UC Davis; Martha Anderson, Virginia – USDA-ARS; Daniel Howes, San Luis Obispo – California Polytechnic State University; Tariq Kadir, Sacramento, CA – Department of Water Resources; Forrest Melton, Monterey, CA – NASA Ames; Morteza Orang, Sacramento, CA – Department of Water Resources

Evapotranspiration (ET) in crops constitutes the major component in the irrigated agricultural water balance. This research advances state of knowledge on crop ET in the California’s Sacramento-San Joaquin Delta, the major hub for the water supply system which overlays a fragile ecosystem. A comparative approach of seven longstanding, independent methods for calculating crop ET is utilized to investigate crop consumptive use in the Delta over during 2015 and 2016 water years. These methods are CalSIMETAW and DETAW (CA Dept. Water Resources), DisALEXI (U.S. Dept. of Agriculture), ITRC-METRIC (Cal Poly), SIMS, (NASA-Ames), UCD-METRIC and UCD-PT (UC Davis). In addition, field measurements of 2015 ET in bare soil, and during 2016, ET in alfalfa, corn and pasture, the predominant crops in the Delta, were taken for comparing with model-estimated ET. Evapotranspiration estimates for 2015 and 2016 are around 1.4 million acre-foot among models, with all estimates within 11 percent of the mean evapotranspiration, with alfalfa, corn and pasture accounting for roughly half of the crop ET in the Delta. Sources of discrepancy in the model include input datasets, method-inherent elements in the ET estimation and modeler’s judgment. Use of this study can assist the state in regulating water transfers, administrating water rights, and improvement water management, as well as estimation of water balances and water accounting for the California’s Sustainable Groundwater Management Act. A consortium for ET estimation involving agencies, academia, industry and stakeholders will facilitate future estimation of ET improving transparency and access to modeled and field data for various purposes.

Josue Medellin-Azuara, PhD, MBA

Associate Professor
University of California Merced

Josué Medellín-Azuara is an Associate Professor at the Department of Civil and Environmental Engineering at the University of California, Merced. He is also an Associate Director of the UC Agricultural Issues Center, and an Adjunct Research Fellow at the Public Policy Institute of California. His areas of expertise include development of large-scale hydro-economic models for water supply, economics of agricultural, environmental and urban water uses, adaptation to climate change, integrated environmental, and consumptive water use. He has a special interest in the Sacramento-San Joaquin Delta and other areas of California. Josué expertise also includes economic impact studies with emphasis on the agriculture-related sector. He has experience working for industry and as consultant for government agencies, NGOs, industry and academia including the Natural Heritage Institute, the Stockholm Environment Institute, The World Bank, the Catholic University of Chile and the University of Rio Grande do Sul. Recently, he’s been the principal investigator for studies on integrated modeling and consumptive use in the Sacramento-San Joaquin Delta. Josué has served as an official for the California Water and Environmental Modeling Forum since 2013. Josué has degrees in engineering, business and economics, and he obtained his Ph.D. from the University of California, Davis with dissertation on managing water in the Colorado River.

Presentation(s):

Send Email for Josue Medellin-Azuara


Assets

397246 - A comparative study of evapotranspiration estimation in the California Bay Delta: Insights from a two-year study using remote sensing, field measurements and unmanned aerial vehicles



Attendees who have favorited this

Please enter your access key

The asset you are trying to access is locked. Please enter your access key to unlock.

Send Email for A comparative study of evapotranspiration estimation in the California Bay Delta: Insights from a two-year study using remote sensing, field measurements and unmanned aerial vehicles