Calibration of pan coefficient for a semi-arid area: a case study
by Sayed-Hamed Sajjadi; Mohsen Zarghani; Atefe Dolat-Abadi; Elham Nazari; Hamed Sarkardeh
International Journal of Hydrology Science and Technology (IJHST), Vol. 7, No. 3, 2017

Abstract: Accuracy of estimated evaporation in the arid and semi-arid areas for hydrologic works is a challenging problem and needs to be calibrated for certain areas. The current study has focused on estimating the accuracy and calibrating of evaporation, evapo-transpiration and pan coefficient equations. In this research, pan evaporation data of Sabzevar synoptic station in Khorasan-Razavi province, Iran was used for investigating the accuracy of Penman (1948) and Shuttleworth (1993) equations for evaporation of pan. Moreover, a comprehensive comparison was performed on actual pan coefficient and also other researcher equations. Finally, three equations were performed for pan evaporation, reference evapo-transpiration and pan coefficient. Calculated determination coefficients are 0.95, 0.87 and 0.64 for evapo-transpiration, pan evaporation and daily pan coefficient, respectively and for 10-day and monthly pan coefficient, this value increased to 0.811 and 0.863, respectively. The RMSE and P-Values showed that presented equations are acceptable.

Online publication date: Tue, 03-Oct-2017

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