Calibration Methods to Estimate Reference Crop Evapotranspiration and Calculated Potential Water Requirements of Olive Plant in Kermanshah Province
Estimating thewater requirement is among themost important factors inthedesign ofirrigationand water resources management. Todetermine thewater requirement, the evaporation-transpiration point of thereference crop should be estimated. Given that avariety of methodshave beenrecommended in this regard...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | fas |
| Published: |
Razi University
2012-07-01
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| Series: | جغرافیا و پایداری محیط |
| Subjects: | |
| Online Access: | https://ges.razi.ac.ir/article_166_0c06d44ecdd92d5c64c30f40d00b983d.pdf?lang=en |
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| Summary: | Estimating thewater requirement is among themost important factors inthedesign ofirrigationand water resources management. Todetermine thewater requirement, the evaporation-transpiration point of thereference crop should be estimated. Given that avariety of methodshave beenrecommended in this regards, selectingthe appropriate methodis a hard and complex task.Inthisstudy,fiveselectedstationsinKermanshah provinceduring theperiodbetween 17 and54yearswere used. Five methods including FAO - Penman-Monteith, Thornthwaite, Modified Blaney-Criddle, modifiedHargreavesandPenman have been used to do the needed calculations which are done based onmonthly and annualdata. Thecalculatedvaluesofthe potential evaporation-transpirationandtherecommendations of theWorld Meteorological Organization indicated that of the fivemethods mentioned aboveFAO - Penman-Monteithprovidesa moreaccurate estimate. Theresultsshowed thatthemonthly and annualmaximum ET0 were8.5and48.9millimeterswhich was forRavansarstationand the minimumorder of5.8and38.4mmwhich was experienced in Kangavarstation, and finally it showed that the maximumannualwater requirementforRavansarstationis923.3mm. |
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| ISSN: | 2322-3197 2676-5683 |