Evaluation of Reference Evapotranspiration Equations under Current Climate Conditions of Egypt
Precise estimation of the reference evapotranspiration is very important and vital in different fields such as agriculture, hydrology and meteorology. The aim of the current study was to evaluate the performance of different reference evapotranspiration methods compared to Class-A pan or E-pan over...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Hasan Eleroğlu
2015-10-01
|
| Series: | Turkish Journal of Agriculture: Food Science and Technology |
| Subjects: | |
| Online Access: | http://www.agrifoodscience.com/index.php/TURJAF/article/view/481 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850250026032300032 |
|---|---|
| author | Gamal El Afandi Mohamed Abdrabbo |
| author_facet | Gamal El Afandi Mohamed Abdrabbo |
| author_sort | Gamal El Afandi |
| collection | DOAJ |
| description | Precise estimation of the reference evapotranspiration is very important and vital in different fields such as agriculture, hydrology and meteorology. The aim of the current study was to evaluate the performance of different reference evapotranspiration methods compared to Class-A pan or E-pan over different agro-climatic regions in Egypt. In this study, Egypt has divided into several agro-climatic regions according to the average air temperature and the reference evapotranspiration from Class-A pan. These were Nile Delta in the north, middle and Upper Egypt. Four reference evapotranspiration (ETo) methods namely; Blaney-Criddle, Hargreaves, Thornthwaite and FAO-56 Penman-Monteith (PM) have been evaluated in this study. The results revealed that, there were statistically no significance between E-Pan and PM at P-value less than 0.05, while the other equations had significant differences. The Hargreaves equation reported the highest ETo value at all regions while Thornthwaite was the lowest one. The difference percentage ratios between FAO-56 Penman-Monteith, Blaney-Criddle, Thornthwaite and Hargreaves and E-Pan were 3.7, -13.3, -24.8 and 10.7 respectively. Hence, FAO-56 Penman-Monteith method has proved its capability in estimation of reference evapotranspiration over different agro-climatic regions in Egypt. Therefore, it could be used over any region in Egypt especially those have no reference evapotranspiration instruments.This study is a regional research, similar studies has been made for different regions by many researchers. Therefore, the determined results in this study can be used for regions with similar climatic conditions. |
| format | Article |
| id | doaj-art-8bf5f4f22c194c9eaf8ba6bbe49c2bf9 |
| institution | OA Journals |
| issn | 2148-127X |
| language | English |
| publishDate | 2015-10-01 |
| publisher | Hasan Eleroğlu |
| record_format | Article |
| series | Turkish Journal of Agriculture: Food Science and Technology |
| spelling | doaj-art-8bf5f4f22c194c9eaf8ba6bbe49c2bf92025-08-20T01:58:20ZengHasan EleroğluTurkish Journal of Agriculture: Food Science and Technology2148-127X2015-10-0131081982510.24925/turjaf.v3i10.819-825.481223Evaluation of Reference Evapotranspiration Equations under Current Climate Conditions of EgyptGamal El Afandi0Mohamed Abdrabbo1College of Agriculture, Environment and Nutrition Sciences, Tuskegee University, 1200 W Montgomery Rd. Tuskegee AL, 36088Central Laboratory for Agricultural Climate, Agricultural Research Center, Dokki 12411, Giza Egypt CityPrecise estimation of the reference evapotranspiration is very important and vital in different fields such as agriculture, hydrology and meteorology. The aim of the current study was to evaluate the performance of different reference evapotranspiration methods compared to Class-A pan or E-pan over different agro-climatic regions in Egypt. In this study, Egypt has divided into several agro-climatic regions according to the average air temperature and the reference evapotranspiration from Class-A pan. These were Nile Delta in the north, middle and Upper Egypt. Four reference evapotranspiration (ETo) methods namely; Blaney-Criddle, Hargreaves, Thornthwaite and FAO-56 Penman-Monteith (PM) have been evaluated in this study. The results revealed that, there were statistically no significance between E-Pan and PM at P-value less than 0.05, while the other equations had significant differences. The Hargreaves equation reported the highest ETo value at all regions while Thornthwaite was the lowest one. The difference percentage ratios between FAO-56 Penman-Monteith, Blaney-Criddle, Thornthwaite and Hargreaves and E-Pan were 3.7, -13.3, -24.8 and 10.7 respectively. Hence, FAO-56 Penman-Monteith method has proved its capability in estimation of reference evapotranspiration over different agro-climatic regions in Egypt. Therefore, it could be used over any region in Egypt especially those have no reference evapotranspiration instruments.This study is a regional research, similar studies has been made for different regions by many researchers. Therefore, the determined results in this study can be used for regions with similar climatic conditions.http://www.agrifoodscience.com/index.php/TURJAF/article/view/481Keywords: ClimateReference EvapotranspirationEstimationE-PanFAO-56 Penman-MonteithBlaney-CriddleHargreavesThornthwaite. |
| spellingShingle | Gamal El Afandi Mohamed Abdrabbo Evaluation of Reference Evapotranspiration Equations under Current Climate Conditions of Egypt Turkish Journal of Agriculture: Food Science and Technology Keywords: Climate Reference Evapotranspiration Estimation E-Pan FAO-56 Penman-Monteith Blaney-Criddle Hargreaves Thornthwaite. |
| title | Evaluation of Reference Evapotranspiration Equations under Current Climate Conditions of Egypt |
| title_full | Evaluation of Reference Evapotranspiration Equations under Current Climate Conditions of Egypt |
| title_fullStr | Evaluation of Reference Evapotranspiration Equations under Current Climate Conditions of Egypt |
| title_full_unstemmed | Evaluation of Reference Evapotranspiration Equations under Current Climate Conditions of Egypt |
| title_short | Evaluation of Reference Evapotranspiration Equations under Current Climate Conditions of Egypt |
| title_sort | evaluation of reference evapotranspiration equations under current climate conditions of egypt |
| topic | Keywords: Climate Reference Evapotranspiration Estimation E-Pan FAO-56 Penman-Monteith Blaney-Criddle Hargreaves Thornthwaite. |
| url | http://www.agrifoodscience.com/index.php/TURJAF/article/view/481 |
| work_keys_str_mv | AT gamalelafandi evaluationofreferenceevapotranspirationequationsundercurrentclimateconditionsofegypt AT mohamedabdrabbo evaluationofreferenceevapotranspirationequationsundercurrentclimateconditionsofegypt |