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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Assessment of an ASTER-generated DEM for 2D hydrodynamic flood modeling
International Journal of Applied Earth Observation and Geoinformation, Volume 12, No. 6, Year 2010
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Description
Flood modeling often provides inputs to flood hazard management. In the present work we studied the flooding characteristics in the data scarce region of the Lake Tana basin at the source of the Blue Nile River. The study required to integrate remote sensing, GIS with a two-dimensional (2D) module of the SOBEK flood model. The resolution of the topographic data in many areas, such as the Lake Tana region, is commonly too poor to support detailed 2D hydrodynamic modeling. To overcome such limitations, we used a Digital Elevation Model (DEM) which was generated from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image. A GIS procedure is developed to reconstruct the river terrain and channel bathymetry. The results revealed that a representation of the river terrain largely affects the simulated flood characteristics. Simulations indicate that effects of Lake Tana water levels propagate up to 13 km along the Ribb River. We conclude that a 15 m resolution ASTER DEM can serve as an input to detailed 2D hydrodynamic modeling in data scarce regions. However, for this purpose it is necessary to accurately reconstruct the river terrain geometry and flood plain topography based on ground observations by means of a river terrain model. © 2010 Elsevier B.V.
Authors & Co-Authors
Tarekegn, Tesfaye Haimanot
Ethiopia, Arba Minch
Arba Minch University
Haile, Alemseged Tamiru
Netherlands, Enschede
Faculty of Geo-information Science and Earth Observation – Itc
Rientjes, Tom H.M.
Netherlands, Enschede
Faculty of Geo-information Science and Earth Observation – Itc
Reggiani, Paolo
Netherlands, Delft
Delft University of Technology
Alkema, Dinand
Netherlands, Enschede
Faculty of Geo-information Science and Earth Observation – Itc
Statistics
Citations: 80
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1016/j.jag.2010.05.007
ISSN:
15698432
e-ISSN:
1872826X
Research Areas
Environmental