Modifying Hargreaves-Samani equation for estimating reference evapotranspiration in dryland regions of Amudarya River Basin
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-Mont...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Scientific Research Publishing, Inc.
2018
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| Online Access: | https://hdl.handle.net/10568/105649 |
| _version_ | 1855516615394721792 |
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| author | Gafurov, Zafar Eltazarov, Sarvarbek Akramov, Bekzod Yuldashev, Tulkun Djumaboev, Kakhramon Anarbekov, Oyture |
| author_browse | Akramov, Bekzod Anarbekov, Oyture Djumaboev, Kakhramon Eltazarov, Sarvarbek Gafurov, Zafar Yuldashev, Tulkun |
| author_facet | Gafurov, Zafar Eltazarov, Sarvarbek Akramov, Bekzod Yuldashev, Tulkun Djumaboev, Kakhramon Anarbekov, Oyture |
| author_sort | Gafurov, Zafar |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| 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. |
| format | Journal Article |
| id | CGSpace105649 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| publisher | Scientific Research Publishing, Inc. |
| publisherStr | Scientific Research Publishing, Inc. |
| record_format | dspace |
| spelling | CGSpace1056492023-07-03T07:48:37Z Modifying Hargreaves-Samani equation for estimating reference evapotranspiration in dryland regions of Amudarya River Basin Gafurov, Zafar Eltazarov, Sarvarbek Akramov, Bekzod Yuldashev, Tulkun Djumaboev, Kakhramon Anarbekov, Oyture river basins evapotranspiration estimation forecasting arid zones temperature irrigated land climatic factors statistical methods 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. 2018 2019-11-06T08:20:35Z 2019-11-06T08:20:35Z Journal Article https://hdl.handle.net/10568/105649 en Open Access Scientific Research Publishing, Inc. 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 |
| spellingShingle | river basins evapotranspiration estimation forecasting arid zones temperature irrigated land climatic factors statistical methods Gafurov, Zafar Eltazarov, Sarvarbek Akramov, Bekzod Yuldashev, Tulkun Djumaboev, Kakhramon Anarbekov, Oyture Modifying Hargreaves-Samani equation for estimating reference evapotranspiration in dryland regions of Amudarya River Basin |
| title | Modifying Hargreaves-Samani equation for estimating reference evapotranspiration in dryland regions of Amudarya River Basin |
| title_full | Modifying Hargreaves-Samani equation for estimating reference evapotranspiration in dryland regions of Amudarya River Basin |
| title_fullStr | Modifying Hargreaves-Samani equation for estimating reference evapotranspiration in dryland regions of Amudarya River Basin |
| title_full_unstemmed | Modifying Hargreaves-Samani equation for estimating reference evapotranspiration in dryland regions of Amudarya River Basin |
| title_short | Modifying Hargreaves-Samani equation for estimating reference evapotranspiration in dryland regions of Amudarya River Basin |
| title_sort | modifying hargreaves samani equation for estimating reference evapotranspiration in dryland regions of amudarya river basin |
| topic | river basins evapotranspiration estimation forecasting arid zones temperature irrigated land climatic factors statistical methods |
| url | https://hdl.handle.net/10568/105649 |
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