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| Type: | Resource | |
| Storage: | The size of this resource is 25.9 MB | |
| Created: | Nov 22, 2019 at 2:46 a.m. | |
| Last updated: | Apr 10, 2021 at 5:23 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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| Views: | 725 |
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Abstract
Spatial estimates of crop evapotranspiration with high accuracy from the field to watershed scale have become increasingly important for water management, particularly over irrigated agriculture in semi-arid regions. Here, we provide a comprehensive assessment on patterns of annual agricultural water use over California’s Central Valley, using 30-m daily evapotranspiration estimates based on Landsat satellite data. A semi-empirical Priestley-Taylor approach was locally optimized and cross-validated with available field measurements for major crops including alfalfa, almond, citrus, corn, pasture, and rice. The evapotranspiration estimates explained more than 70% variance in daily measurements from independent sites with an RMSE of 0.88 mm day-1. When aggregated over the Valley, we estimated an average evapotranspiration of 820 +- 290 mm yr-1 in 2014. Agricultural water use varied significantly across and within crop types, with a coefficient of variation ranging from 8% for Rice (1110 +- 85 mm yr-1) to 59% for Pistachio (592 +- 352 mm yr-1). Total water use in 2016 increased by 9.6%, as compared to 2014, mostly because of land-use conversion from fallow/idle land to cropland. Analysis across 134 Groundwater Sustainability Agencies (GSAs) further showed a large variation of agricultural evapotranspiration among and within GSAs, especially for tree crops, e.g., almond evapotranspiration ranging from 339 +- 80 mm yr-1 in Tracy to 1240 +- 136 mm yr-1 in Tri-County Water Authority. Continuous monitoring and assessment of the dynamics and spatial heterogeneity of agricultural evapotranspiration provide data-driven guidance for more effective land use and water planning across scales.
Subject Keywords
Coverage
Spatial
Temporal
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Content
Credits
Funding Agencies
This resource was created using funding from the following sources:
| Agency Name | Award Title | Award Number |
|---|---|---|
| Office of the Delta Watermaster | Sacramento-San Joaquin Delta Consumptive Water Use Project | |
| NASA JPL | ECOSTRESS Science Team Project | |
| California Space Grant Consortium | Space Grant | |
| AmericaView | CaliforniaView Research Project |
How to Cite
This resource is shared under the Creative Commons Attribution-NoCommercial-ShareAlike CC BY-NC-SA.
http://creativecommons.org/licenses/by-nc-sa/4.0/
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