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Reconstruction of megalake Chad using shuttle radar topographic mission data

Leblanc, Marc, Favreau, Guillaume, Maley, Jean, Nazoumou, Yahaya, Leduc, Christian, Stagnitti, Frank, Van Oevelen, Peter J., Delclaux, François and Lemoalle, Jacques 2006, Reconstruction of megalake Chad using shuttle radar topographic mission data, Palaeogeography, palaeoclimatology, palaeoecology, vol. 239, no. 1-2, pp. 16-27, doi: 10.1016/j.palaeo.2006.01.003.

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Title Reconstruction of megalake Chad using shuttle radar topographic mission data
Author(s) Leblanc, Marc
Favreau, Guillaume
Maley, Jean
Nazoumou, Yahaya
Leduc, Christian
Stagnitti, Frank
Van Oevelen, Peter J.
Delclaux, François
Lemoalle, Jacques
Journal name Palaeogeography, palaeoclimatology, palaeoecology
Volume number 239
Issue number 1-2
Start page 16
End page 27
Publisher Elsevier BV
Place of publication Amsterdam, Netherlands
Publication date 2006-09-12
ISSN 0031-0182
Keyword(s) climate change
Lake Chad
terrain analysis
Summary In the 2,500,000 km2 Lake Chad Basin in central Africa, the 2000 Shuttle Radar Topographic Mission (SRTM) data have been used to supplement the existing topographic data. SRTM data produce much sharper images of the region's topography and provide new insights into debates about the nature and extent of late Quaternary Lake Chad. This paper shows that the accuracy of SRTM30, the recently released 30 arc seconds topographic data from SRTM, largely surpasses that of previous global Digital Elevation Models (DEMs) available in the region. Using a GIS we identified from SRTM30 elevation data key features in the landscape topography providing further evidence for the existence of a Megalake Chad. The SRTM30 data corroborate the presence of two ancient shorelines associated with stillstands of the paleolake at the elevation of the Mayo Kebbi and Bahr el Ghazal spillovers. We found a general flattening of the topography in the region covered by Megalake Chad which is most likely the result of wave-cut action. The SRTM30 data show that the remains of the highest paleoshoreline have a constant elevation of 325 ± 5 m amsl. At its maximum extent, Megalake Chad had an area of about 340 000 km2 (only 8% less than the present-day world's largest lake, the Caspian Sea). The SRTM30 data also revealed ancient drainage networks in the Sahara that lead to Megalake Chad. We compiled available 14C dates to constrain Holocene Megalake Chad events. The results presented in this paper have significant consequences for improving our knowledge of regional paleohydrology and continental climate change. This study is also the first step for a GIS-based reconstruction of late Quaternary paleohydrology in tropical Africa.
Notes Available online 23 March 2006.
Language eng
DOI 10.1016/j.palaeo.2006.01.003
Field of Research 090905 Photogrammetry and Remote Sensing
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2006, Elsevier B.V.
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Document type: Journal Article
Collection: School of Life and Environmental Sciences
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