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| Titel |
The use of remote sensing to quantify wetland loss in the Choke Mountain range, Upper Blue Nile basin, Ethiopia |
| VerfasserIn |
E. Teferi, S. Uhlenbrook, W. Bewket, J. Wenninger, B. Simane |
| 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 ; 14, no. 12 ; Nr. 14, no. 12 (2010-12-03), S.2415-2428 |
| Datensatznummer |
250012521
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| Publikation (Nr.) |
 copernicus.org/hess-14-2415-2010.pdf |
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| Zusammenfassung |
| Wetlands provide multiple ecosystem services such as storing and regulating
water flows and water quality, providing unique habitats to flora and fauna,
and regulating micro-climatic conditions. Conversion of wetlands for
agricultural use is a widespread practice in Ethiopia, particularly in the
southwestern part where wetlands cover large areas. Although there are many
studies on land cover and land use changes in this region, comprehensive
studies on wetlands are still missing. Hence, extent and rate of wetland
loss at regional scales is unknown. The objective of this paper is to
quantify wetland dynamics and estimate wetland loss in the Choke Mountain
range (area covering 17 443 km2) in the Upper Blue Nile basin, a key
headwater region of the river Nile. Therefore, satellite remote sensing
imagery of the period 1986–2005 were considered. To create images of surface
reflectance that are radiometrically consistent, a combination of
cross-calibration and atmospheric correction (Vogelman-DOS3) methods was
used. A hybrid supervised/unsupervised classification approach was used to
classify the images. Overall accuracies of 94.1% and 93.5% and Kappa
Coefficients of 0.908 and 0.913 for the 1986 and 2005 imageries,
respectively were obtained. The results showed that 607 km2 of seasonal
wetland with low moisture and 22.4 km2 of open water are lost in the
study area during the period 1986 to 2005. The current situation in the
wetlands of Choke Mountain is characterized by further degradation which
calls for wetland conservation and rehabilitation efforts through
incorporating wetlands into watershed management plans. |
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