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2SAS - Sol Agro et hydrosystème Spatialisation (UMR 1069, Sol Agro et Hydrosystème Spatialisation, Batiment 13, Agrocampus Ouest, 65 rue de Saint Brieuc CS 84215 35042 Rennes CEDEX - France)
AGROCAMPUS OUEST (Institut Supérieur des Sciences Agronomiques, Agroalimentaires, Horticoles et du Paysage - 65, rue de St Brieuc - CS 84215 - 35042 Rennes cedex - France)
Abstract : ln the Senegal middle valley, the salt distribution is not related to the present faint topography. This lack of logic is one of the major constraints for establishment of new irrigated areas. The salt distribulion is here studied to better understand its variability, and to describe its structure and spatial arrangement. Saline areas are delineated measuring the electromagnetic soil conduclivity (EM). The kriged map is compared to the aerial photograph. The salinity is distributed as stripes in the SW-NE direclion, fringing a former creek on the southem bank. The stripe is intersected by an actual creek bed, indicating that the salt distribution is ancienl and does not result from a recent remobilization of the marine salt incorporated in the soil. The relalionship between salt distribution and the former geomorphology allows us to survey the whole N'Galenka region using the EM measuremenls on selected transects.
https://hal-insu.archives-ouvertes.fr/insu-00957979 Contributor : Nathalie POTHIERConnect in order to contact the contributor Submitted on : Tuesday, March 11, 2014 - 2:11:20 PM Last modification on : Wednesday, April 6, 2022 - 4:08:09 PM Long-term archiving on: : Sunday, April 9, 2017 - 10:44:14 PM
Laurent Barbiero, Caroline Laperrousaz. Cartographie de la salinité dans la vallée du Sénégal. Succès d'une démarche ascendante. Pangea infos, Société Géologique de France, 1999, 31/32, pp.5-7. ⟨insu-00957979⟩