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Modifying Hargreaves-Samani equation for estimating reference evapotranspiration in dryland regions of Amudarya River Basin

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Title Modifying Hargreaves-Samani equation for estimating reference evapotranspiration in dryland regions of Amudarya River Basin
 
Creator Gafurov, Zafar
Eltazarov, S.
Akramov, Bekzod
Yuldashev, Tulkun
Djumaboev, Kakhramon
Anarbekov, Oyture
 
Subject river basins
evapotranspiration
estimation
forecasting
arid zones
temperature
irrigated land
climatic factors
statistical methods
 
Description Reference evapotranspiration (ETo) is a key factor in determining the amount of water needed for crops, which is crucial to correct irrigation planning. FAO Penman-Monteith (EToPM) is among the most popular method to estimate ETo. Apparently sometimes it is difficult to compute ETo using Penman-Monteith due to challenges on data availability. FAO Penman-Monteith method requires many parameters (solar radiation, air temperature, wind speed and humidity), while Hargreaves-Samani method calculates ETo based on air temperature. Because Central Asia is a data limited region with weather stations unable to provide all required parameters for the PM method, this study aimed to estimate ETo using the Hargreaves and Samani (HS) method in Karshi Steppe, in Kashkadarya province, in southern Uzbekistan, based on data from 2011 to 2017. Reference evapotranspiration calculated by non-modified HS method is underestimated during the summer months. The reason for this underestimation might be higher air temperature and wind speed during these months. Therefore, the HS method in its original form cannot be used in our study area to estimate ETo. Modification of the EToHS, through application of a bias correction factor, had better performance and allowed improving the accuracy of the ETo calculation for this region. The calculated ETo values can inform decision making and management practices regarding water allocation, irrigation scheduling and crop selection in dry land regions of Amudarya river basin and the greater Central Asia area.
Peer Review
 
Date 2019-11-06T08:20:35Z
2019-11-06T08:20:35Z
2018-08-31
 
Type Journal Article
 
Identifier Gafurov, Zafar; Eltazarov, S.; Akramov, Bekzod; Yuldashev, Tulkun; Djumaboev, Kakhramon; Anarbekov, Oyture. 2018. Modifying Hargreaves-Samani equation for estimating reference evapotranspiration in dryland regions of Amudarya River Basin. Agricultural Sciences, 9(10):1354-1368. doi: 10.4236/as.2018.910094
2156-8553
2156-8561
https://hdl.handle.net/10568/105649
 
Language en
 
Rights Copyrighted; all rights reserved
 
Format 9(10):1354-1368.
 
Source Agricultural Sciences