Calibrating Priestley-Taylor coefficient to estimate free water surface evaporation (Case Study: Mahabad Dam Reservoir)

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Ghobadi Anahita; DANESHKAR ARASTEH PEYMAN; KHEZRI SEYYED MOSTAFA

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Journal: IRANIAN JOURNAL OF ECOHYDROLOGY Year:2017 | Volume:4 | Issue:3 Page(s): 803-815

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Title

Calibrating Priestley-Taylor coefficient to estimate free water surface evaporation (Case Study: Mahabad Dam Reservoir)

Author(s)

Ghobadi Anahita | DANESHKAR ARASTEH PEYMAN | KHEZRI SEYYED MOSTAFA | Issue Writer Certificate

Keywords

Priestley-Taylor coefficientQ2

Penman equationQ2

advection aridity modelQ2

Bouchet hypothesisQ2

Mahabad dam reservoirQ2

Abstract

Evapotranspiration is one of the important components of basin water balance which cannot be measured directly at the basin scale. Therefore, it is inevitably estimated through indirect methods. In this regard, the advection aridity model, one of the widely used models of complementary relationship, has attracted lots of attentions. Due to the existence of Priestley-Taylor equation in the advection aridity model, it is required to calibrate Priestley-Taylor coefficient to increase the accuracy of the model. The current research aims at calibrating Priestley-Taylor coefficient in estimation of potential evaporation through Penman method to apply it in the advection aridity model in the studied area of Mahabad dam reservoir, Iran. The required data were collected for a period of 26 years (1986-2012) from Mahabad 1st order meteorological station which is located a short distance from Mahabad reservoir. The results showed that Priestley-Taylor coefficient undergoes monthly changes during a year and decreases during the warm months of the year. Therefore, it is better to use its monthly values in calculations. In the area under study, its minimum and maximum averages were 1. 01 and 1. 68, respectively. Moreover, the long term average of this coefficient during a period of 26 years has been calculated to be 1. 25.

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APA: Copy

Ghobadi, Anahita, DANESHKAR ARASTEH, PEYMAN, & KHEZRI, SEYYED MOSTAFA. (2017). Calibrating Priestley-Taylor coefficient to estimate free water surface evaporation (Case Study: Mahabad Dam Reservoir). IRANIAN JOURNAL OF ECOHYDROLOGY, 4(3 ), 803-815. SID. https://sid.ir/paper/254196/en

Vancouver: Copy

Ghobadi Anahita, DANESHKAR ARASTEH PEYMAN, KHEZRI SEYYED MOSTAFA. Calibrating Priestley-Taylor coefficient to estimate free water surface evaporation (Case Study: Mahabad Dam Reservoir). IRANIAN JOURNAL OF ECOHYDROLOGY[Internet]. 2017;4(3 ):803-815. Available from: https://sid.ir/paper/254196/en

IEEE: Copy

Anahita Ghobadi, PEYMAN DANESHKAR ARASTEH, and SEYYED MOSTAFA KHEZRI, “Calibrating Priestley-Taylor coefficient to estimate free water surface evaporation (Case Study: Mahabad Dam Reservoir),” IRANIAN JOURNAL OF ECOHYDROLOGY, vol. 4, no. 3 , pp. 803–815, 2017, [Online]. Available: https://sid.ir/paper/254196/en

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