Calibration of pan coefficient for a semi-arid area: a case study Online publication date: Tue, 03-Oct-2017
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
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Hydrology Science and Technology (IJHST):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email email@example.com