Evaluation of reference evapotranspiration models for warm arid climate (Case study: Zahedan station)

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KAHKHAMOGHADAM P.

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Journal: Journal of Water and Soil Conservation Year:2018 | Volume:25 | Issue:1 Page(s): 309-317

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Title

Evaluation of reference evapotranspiration models for warm arid climate (Case study: Zahedan station)

Author(s)

KAHKHAMOGHADAM P. | Issue Writer Certificate

Keywords

Hargreaves-SamaniQ2

Penman-Monteith FAOQ1

TurkQ1

ZahedanQ1

Abstract

Background and Objectives: Evapotranspiration (ET) is an importantparameter for climatological and hydrological studies, aswell as for irrigation planning and management. Evaluation of simple reference evapotranspiration (ETo) methods has received considerable attention in developing countries where the weather data needed to estimate ETo by the Penman– Monteith FAO 56 (PMF-56) model are often incomplete and/or not available. So, The purpose of this study was evaluation and comparison 30 different methods according to PMF-56 method and determination the best equation as a replacement to PMF-56 in the warmarid climate of Zahedan city. Materials and Methods: In this study, 30 commonly used ETo equations that belonged to four groups: (1) pan evaporation-based methods, (2) temperature-based methods (3) radiation-based methods, and (4) mass transfer-based methods were evaluated against the PMF-56 standard model; and the best and worst equations of each category were determined from the Zahedan station located in a warm arid climate. Results: Initially, in each group the monthly mean values ETo (using 30 model) were determined and compared their relativeperformancewith respect to PMF-56 ETo estimates in the study. The ETo calculated by the Snyder equation (R2=0. 85, NRMSE=0. 08, PE=8. 30), Hargreaves-4 (R2=0. 93, NRMSE=0. 04, PE=8. 33), Turk 24 (R2=0. 96, NRMSE=0. 03, PE=6. 52) and Dalton (R2=0. 81, NRMSE=0. 18, PE=12. 89), pan evaporation-based, temperature-based, radiation-based and mass transfer-based respectively bestmatched the ETo estimates by the PMF-56 equation withthe lowest errors rates. Conclusion: In general, the comparativeresults showed that the mass transfer-based equationshad the worst performances, while the radiation-based andtemperature-based models (as Turk, Jensen-Haise, Hargreaves-4 and Blaney-Criddle) were the best-suited equations forestimating ETo in this warm arid climate (Zahedan). Considering the unavailability of full weather data for applying the PMF-56 model for estimation of ETo in many regions of the worldand in different parts of the Iran, especially in developing countries, the results will be useful for choosing the simpler ETo methods in warm arid climates.

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APA: Copy

KAHKHAMOGHADAM, P.. (2018). Evaluation of reference evapotranspiration models for warm arid climate (Case study: Zahedan station). JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 25(1 ), 309-317. SID. https://sid.ir/paper/156380/en

Vancouver: Copy

KAHKHAMOGHADAM P.. Evaluation of reference evapotranspiration models for warm arid climate (Case study: Zahedan station). JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2018;25(1 ):309-317. Available from: https://sid.ir/paper/156380/en

IEEE: Copy

P. KAHKHAMOGHADAM, “Evaluation of reference evapotranspiration models for warm arid climate (Case study: Zahedan station),” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 25, no. 1 , pp. 309–317, 2018, [Online]. Available: https://sid.ir/paper/156380/en

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