Abstract
In this paper, the Penman-Monteith method was applied to evaluate the reference crop evapotranspiration. A reliable estimation of the reference evapotranspiration (ETo) is of critical importance and required accurate estimates to close the water balance. The aim of this paper is estimating the reference evapotranspiration (ETo) as preliminary to use for groundwater modeling in the area. Based on FAO-Penman-Monteith method, ETo calculator software was applied. Meteorological data within this study were obtained from two gauges stations (Xing ping and Wu gong) and available literatures. The results indicated that the values of ETo for a period (1981-2009)—29 years—in two stations approximately the same. Specifically, is ranged between 0.4 - 6.9 mm /day, 0.4 - 6.7 mm/day and the average value is 2.6 mm/ day, 2.6 mm/day in Xing ping and Wu gong respectively. In addition, the maximum values were occurred in summer season (May, June and July). The result also found that the correlation coefficient ≈ 1. Moreover, “ETo” was increasing by recent years. The reference crop evapotranspiration for some crops were calculated.
Highlights
Estimates of reference crop evapotranspiration (ETo) are widely used in irrigation engineering to define crop water requirements
Meteorological data within this study were obtained from two gauges stations (Xing ping and Wu gong) and available literatures
The reference evapotranspiration (ETo) from meteorological data is assessed in the ETo calculator Software by means of the Food and Agriculture Organization (FAO) Penman-Monteith equation
Summary
Estimates of reference crop evapotranspiration (ETo) are widely used in irrigation engineering to define crop water requirements. These estimates are used in the planning process for irrigation schemes to be developed as well as to manage water distribution in existing schemes. From the several existing ETo equations, the FAO-56 application of the Penman-Monteith equation [1] is currently widely used and can be considered as a sort of standard [2]. The FAO-56 Penman-Monteith equation is referred to hereafter as PM. The PM has two advantages over many other methods. The method is well documented, implemented in a wide range of software, and has been tested using a variety of lysimeters [3]
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