Evaluation of an Improved Empirical Equation for Estimation of Reference Evapotranspiration in Arid Areas | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 10, Volume 11, Issue 12, December 2020, Page 765-768 PDF (766.29 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2020.160914 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
A. Alharbi1; A. Alzoheiry  2
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| 1Plant Production and Protection Department, College of Agricultural & veterinary medicine, Qassim University, KSA. | ||||
| 21Plant Production and Protection Department, College of Agricultural & veterinary medicine, Qassim University, KSA. 2Department of Agricultural Eng. & Natural Resources, College of Agriculture, Damanhour University, Egypt | ||||
| Abstract | ||||
| A model for predicting the reference evapotranspiration ETo in arid areas was developed and evaluated. The model was developed based on the Jensen-Heise model with added coefficients and the original coefficients of the model were calibrated for the conditions of the area. For evaluation, the ETo values of the model were compared to the ETo values obtained using the FAO Penman Monteith method. The model was also evaluated using a set of weather data (14 years of data) obtained from a location 350 km from the original site. The model improved the prediction at the original site reducing the overall Mean Absolute error (MAE)from1.62 using the Jensen-Heise model to 0.84 using the Modified Jensen-Heise (MJH) model. Calibrating the values of the coefficients to the new location improved the performance of the model and made it better than the Jensen-Heise model decreasing the overall MAE from 2.75 for the Jensen-Heise model to 1.24 and 1.22 for the 3 and the 14 years calibration, respectively. | ||||
| Keywords | ||||
| Reference evapotranspiration; Modeling; Arid | ||||
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