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Dynamique et détection des changements des unités d’occupation du sol du Nord de l’estuaire du Saloum (Sénégal) de 1973 à 2014

The study area is characterized by a high salinity of its land. This space is between the Joal-Fadiouth lagoon and the right bank boundary of the Saloum estuary between latitudes 13°97 'and 14°32' North and longitudes 16°39 'and 16°20' West. These salted lands have existed since the recent Quaternary, but their current evolution is amplified by the climatic variability over the last decades and by the human activities. The objective of this research is to analyse dynamics of soil salinity in the northern Saloum estuary. The methodological approach adopted is based on satellite images processing. It processes Landsat MSS satellite images from 1973, TM from 1984, 1992, ETM + 2006, OLI and TIRS from 2014. The classification of maximum likelihood validated by field truths, by determination of the matrices of confusion and calculation of Kappa indices enabled characterizing the dynamics of salty lands. Results from the classification showed a strong advance of the salty lands during the last two decades. From 1994 to 2014, salty land increased of 21 000 ha. The annual average increase of salt affected area is estimated at 1 000 ha since 1994.

Auteur(s) : FAYE B., TINE D., DIOP Ch., NDIAYE D., NDIAYE A. and FAYE G
Pages : PP 79- 96
Année de publication : 2019
Revue : Revue Marocaine de Géomorphologie
N° de volume : vol.25 - n°2 | 2019
Type : Article
Mise en ligne par : NDIAYE Aminata