Résultats du suivi 2010-2012 de l'évolution de la brèche ouverte sur la Langue de Barbarie au Sénégal et de ses conséquences

Physio-Géo. Géographie physique et environnement

Sy, Amadou Abou¹  Sy, Boubou Aldiouma¹  Perez, Isora Sanchez¹  Bilbao, Ignacio Alonso¹  Valido, Silvia Rodriguez¹ 

关键词: fleuve Sénégal;    Sénégal;    géomorphologie littorale;    évolution morphosédimentaire;    cordon littoral;    lagune;    Gandiolais;    Langue de Barbarie;    Senegal River;    coastal geomorphology;    morphosedimentary evolution;    barrier beach;    lagoon;   

DOI  :  10.4000/physio-geo.3569

学科分类：自然科学（综合）

来源: Revues.org

【 摘 要 】

The results of ESEDSEN (Étude sédimentaire du Sénégal – Sedimentary Study of Senegal) project are a contribution to the knowledge of the recent space-temporal evolution of the breach artificially opened in 2003 on the Langue de Barbarie and its consequences. Topographic profiles carried out between October 2010 and December 2011 indicate that the north bank rose 550 m to the south between March and December 2011. Meanwhile, the same bank has expanded nearly 100 m. The northern shore functions as a storage and/or redistribution center of sediment discharge fueling the formation of sandbars in and/or near the mouth of the Senegal River. During the same period, the south bank fell by 830 m. The width of the gap fluctuates because of the seasons and hydrodynamic factors, but in a general expansion dynamics (28 m/month on average over the period of observation.) In October 2012, the Langue de Barbarie went through a major natural break a little further in the South. This dynamics of the breach exposes the left bank of the lagoon of Mboumbaye (Gandiolais cliff) to rapid erosion, shoreline retreat being greater than 15 m/year in the most affected sectors. The economic and environmental potential of the Gandiolais coastline are then threatened by the southern migration of the mouth of the Senegal River.

【 授权许可】

Unknown