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| Titel |
Satellite-based energy balance model to estimate seasonal evapotranspiration for irrigated sorghum: a case study from the Gezira scheme, Sudan |
| VerfasserIn |
M. A. Bashir, T. Hata, H. Tanakamaru, A. W. Abdelhadi, A. Tada |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 12, no. 4 ; Nr. 12, no. 4 (2008-08-26), S.1129-1139 |
| Datensatznummer |
250010764
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| Publikation (Nr.) |
 copernicus.org/hess-12-1129-2008.pdf |
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| Zusammenfassung |
| The availability of the actual water use from agricultural crops is
considered as the key factor for irrigation water management, water
resources planning, and water allocation. Traditionally, evapotranspiration
(ET) has been calculated in the Gezira scheme as the point of reference with
evapotranspiration (ETo) and crop coefficients (kc) being
derived from actual measurements of soil-water balance. Recently developed, advanced
energy balance models assisted in estimating the ET through the remotely
sensed data. In this study Enhanced Thematic Mapper Plus (ETM+) and MODerate
Resolution Imaging Spectroradiometer (MODIS) images were used to estimate
the spatial distribution of the daily, monthly and seasonal ET for irrigated sorghum
in the Gezira scheme, Sudan. The daily ET maps were also used to estimate
kc over time and space. Results of the energy balance, based on being remotely sensed,
were compared to actual measurements conducted during 2004/05 season. The
seasonal actual ET values, obtained from the seven MODIS images for
irrigated sorghum, were estimated at 579 mm. The values for remotely sensed kc,
derived during the initial mid-season and late-season crop development stages,
were 0.62, 0.85, 1.15, and 0.48, respectively. On the other hand, the
values for the experimental kc during the pervious mention stages were
0.55, 0.94, 1.21 and 0.65, respectively. The estimated seasonal ET of the sorghum, derived by remotely
sensed kc, was 674 mm. The Landsat data and the Free MODIS
provided reliable, exhaustive, and consistent information on the water use, relevant for decision support in the Gezira scheme. |
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