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Calculation and Simulation of Evapotranspiration of Applied Water |
Richard L Snyder, Morteza Orang, Sara Sarreshteh |
1.Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA
2.School of Environment and Energy, Shenzhen Graduate School, Peking University, Shenzhen 518055, P.R.China
3.Department of Plant Sciences, University of California, Davis, CA 95616, USA
4.California Department of Water Resources, Division of Statewide Integrated Water Management, Water Use and Efficiency, Sacramento,
CA 94236, USA |
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摘要 The University of California, Davis and the California Department of Water Resources have developed a weather generator application program “SIMETAW” to simulate weather data from climatic records and to estimate reference evapotranspiration (ETo) and crop evapotranspiration (ETc) with the generated simulation data or with observed data. A database of default soil depth and water holding characteristics, effective crop rooting depths, and crop coefficient (Kc) values to convert ETo to ETc are input into the program. After calculating daily ETc, the input and derived data are used to determine effective rainfall and to generate hypothetical irrigation schedules to estimate the seasonal and annual evapotranspiration of applied water (ETaw), where ETaw is the net amount of irrigation water needed to produce a crop. In this paper, we will discuss the simulation model and how it determines ETaw for use in water resources planning.
Abstract The University of California, Davis and the California Department of Water Resources have developed a weather generator application program “SIMETAW” to simulate weather data from climatic records and to estimate reference evapotranspiration (ETo) and crop evapotranspiration (ETc) with the generated simulation data or with observed data. A database of default soil depth and water holding characteristics, effective crop rooting depths, and crop coefficient (Kc) values to convert ETo to ETc are input into the program. After calculating daily ETc, the input and derived data are used to determine effective rainfall and to generate hypothetical irrigation schedules to estimate the seasonal and annual evapotranspiration of applied water (ETaw), where ETaw is the net amount of irrigation water needed to produce a crop. In this paper, we will discuss the simulation model and how it determines ETaw for use in water resources planning.
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Received: 16 November 2011
Accepted: 11 March 2012
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Corresponding Authors:
Correspondence Shu Geng, Tel: +86-755-26032802, E-mail: sgeng@ucdavis.edu, gengxu@pkusz.edu.cn
E-mail: sgeng@ucdavis.edu
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Cite this article:
Richard L Snyder, Morteza Orang, Sara Sarreshteh.
2012.
Calculation and Simulation of Evapotranspiration of Applied Water. Journal of Integrative Agriculture, 12(3): 489-501.
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