L’influence des actions anthropiques dans l’évolution historique d’un littoral sableux à forte dérive sédimentaire : la baie de Port-Bouët (Abidjan, Côte d’Ivoire) = The influence of anthropic actions in the historical coastal evolution of a sandy coast with high sediment drift: the Bay of Port-Bouet (Abidjan, Ivory Coast)
Toure, B.; Kouame, K.; Souleye, W.; Collet, C.; Affian, K.; Ozer, A.; Rudant, J.; Biemi, J. (2012). L’influence des actions anthropiques dans l’évolution historique d’un littoral sableux à forte dérive sédimentaire : la baie de Port-Bouët (Abidjan, Côte d’Ivoire) = The influence of anthropic actions in the historical coastal evolution of a sandy coast with high sediment drift: the Bay of Port-Bouet (Abidjan, Ivory Coast). Géomorphologie 18(3): 369-382. https://dx.doi.org/10.4000/geomorphologie.9990 In: Géomorphologie. SEDES: Paris. ISSN 1266-5304, more |  |
| Keyword | | | Author keywords | coastal zone; beach erosion; remote sensing; management; Ivory Coast |
| Authors | | Top | - Toure, B.
- Kouame, K.
- Souleye, W.
- Collet, C.
| - Affian, K.
- Ozer, A., more
- Rudant, J.
- Biemi, J.
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| Abstract | The erosion affecting the coast of Port-Bouet (Abidjan, Ivory Coast) is a major threat and concern to the economic infrastructure of the Ivorian Refining Company (SIR), the Felix Houphouet Boigny airport international and homes along the coast. In recent years, in order to better understand this scientific accumulation-erosion budget phenomenon, CURAT (Centre Universitaire de Recherche et d'Application en Teledetection) undertook studies both in situ and from a mapping approach to assess the rate of coastal retreat on the sandy coasts of the Ivory Coast. In this study, the study changes in the morphology of the coastal area of Abidjan, the economic capital of Cote d'Ivoire, was derived from the use of the software Digital Shoreline Analysis System (DSAS) to process vertical aerial photographs, and Corona and HRG panchromatic SPOT-5 imagery to estimate the displacement of shorelines by photointerpretation. The mid-secular evolution of the coastline (beach dune contact) has been analysed over 42 years (1967-2009). We discuss the role of the destabilising developments and crises on the erosive dynamics of the coastline in the Bay of Port-Bouet, which seek a new equilibrium position by readapting its shore relative to the longshore drift. As a result, a new up drift zone has developed, resulting in a general enhancement of the concavity of the bay of Port-Bouet. |
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