Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

 

Publications des scientifiques de l'IRD

Castelle B., Almar Rafaël, Dorel Matthieu, Lefebvre Jean-Pierre, Senechal N., Anthony E. J., Laibi R., Chuchla Rémy, Penhoat Yves du. (2014). Rip currents and circulation on a high-energy low-tide-terraced beach (Grand Popo, Benin, West Africa). Journal of Coastal Research, (no spécial 70), 633-638. ICS 2014 : International Coastal Symposium, Durban (ZFA), 2014/04/13-18. ISSN 0749-0208

Accès réservé (Intranet IRD) Demander le PDF

Lien direct chez l'éditeur doi:10.2112/si70-107.1

Titre
Rip currents and circulation on a high-energy low-tide-terraced beach (Grand Popo, Benin, West Africa)
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000338176100108
AuteursCastelle B., Almar Rafaël, Dorel Matthieu, Lefebvre Jean-Pierre, Senechal N., Anthony E. J., Laibi R., Chuchla Rémy, Penhoat Yves du.
SourceJournal of Coastal Research, 2014, (no spécial 70)p. 633-638. ISSN 0749-0208
ColloqueICS 2014 : International Coastal Symposium, Durban (ZFA), 2014/04/13-18
RésuméRip currents are wave-driven intense seaward-flowing jets of water that are important to both beach morphodynamics and the overall ecosystem. Rip currents are also the leading deadly hazard to recreational beach users worldwide. More specifically, the African region is reported to have the highest rates of drowning in the world, yet both the occurrence and the type of rips developing along the African beaches are unknown. In February 2013, a 12-day field experiment was performed at the high-energy low-tide-terraced sandy beach of Grand Popo beach (Benin, West Africa). Human drifter data and video imagery are combined to address wave-driven circulation and rip current activity. Results show two prevailing rip current types. (1) Low-energy (similar to 0.2-0.4 m/s) swash rips, with short life-spans of about 1 minute, extend about 5-10 m offshore and occur preferably at mid to high tide at fixed locations in the center of beach cusps. (2) Higher-energy (0.2-.8 m/s) surfzone flash rips become active with the onset of intense wave breaking across the low-tide terrace. They tend to migrate downdrift with a longer time-span of about 2-5 minutes. The relatively weak longshore current (0.2 - 0.55 m's) measured during the experiment suggests that flash rips were driven by vortices generated by wave breaking rather than shear instabilities of the longshore current. Swash rips and flash rips are common at Grand Popo and often co-exist We propose a conceptual model of both flash and swash rip activity on this stretch of the West African coast
Plan de classementLimnologie physique / Océanographie physique [032]
Descr. géo.BENIN
LocalisationFonds IRD [F B010063185]
Identifiant IRDfdi:010063185
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010063185

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito