Application of Meteosat thermal data to map soil infiltrability in the central part of the Lake Chad basin, Africa

Leblanc, Marc, Razack, Moumtaz, Dagorne, Dominique, Mofor, Linus, and Jones, Christopher (2003) Application of Meteosat thermal data to map soil infiltrability in the central part of the Lake Chad basin, Africa. Geophysical Research Letters, 30 (19). HLS 4.

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View at Publisher Website: http://dx.doi.org/10.1029/2003GL018094
 
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Abstract

In the central part of the Lake Chad Basin, Africa, the superficial Quaternary aquifer (500,000 km2) forms the main water resource. Little is known about the aquifer recharge processes. Large piezometric depressions affect the aquifer and are still unexplained. Meteosat thermal composite data were used to infer qualitative information about time-space variations of soil moisture. Over the aquifer, Meteosat data reveal that after heavy rainfall, the piezometric depressions (Kadzell, Chari-Baguirmi) appear cooler than the surrounding areas (Manga and Harr). The interpretation is that above the depressions, rainwater accumulates at the surface and does not infiltrate deep into the ground, leading to the observed cooler ground. Accordingly, the depressions are characterized by low rainwater infiltrability, which presumably results in a small rainfall recharge. As far as we know, this is the first time that an observed surface phenomenon is directly related to the origin of some piezometric depressions.

Item ID: 1722
Item Type: Article (Research - C1)
ISSN: 1944-8007
Keywords: groundwater, hydrology, piezometric depressions, Meteosat, Africa, remote sensing, Lake Chad
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Date Deposited: 10 Oct 2007
FoR Codes: 09 ENGINEERING > 0909 Geomatic Engineering > 090905 Photogrammetry and Remote Sensing @ 0%
04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040608 Surfacewater Hydrology @ 0%
04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology @ 0%
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