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

IRD

Publications des scientifiques de l'IRD

Floc'h F., Mabiala G.R., Almar Rafaël, Penhoat Yves du, Halls N., Castelle B., Scott T., Daly C. (2017). Nearshore sedimentary transfer : on flash rip activity quantification [résumé]. In : Brehmer Patrice (ed.), Ba B. (ed.), Kraus G. (ed.) International conference ICAWA 2016 : extended book of abstract : the AWA project : ecosystem approach to the management of fisheries and the marine environment in West African waters. Dakar : SRFC/CSRP ; IRD, 152. ICAWA : International Conference AWA, 3., Dakar (SEN), 2016/12/13-15. ISBN 978-2-9553602-0-5

Fichier PDF disponible http://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers18-01/010072152.pdf

Titre
Nearshore sedimentary transfer : on flash rip activity quantification [résumé]
Année de publication2017
Type de documentColloque
AuteursFloc'h F., Mabiala G.R., Almar Rafaël, Penhoat Yves du, Halls N., Castelle B., Scott T., Daly C.
InBrehmer Patrice (ed.), Ba B. (ed.), Kraus G. (ed.) International conference ICAWA 2016 : extended book of abstract : the AWA project : ecosystem approach to the management of fisheries and the marine environment in West African waters
SourceDakar : SRFC/CSRP ; IRD, 2017, p. 152. p. 152 ISBN 978-2-9553602-0-5
ColloqueICAWA : International Conference AWA, 3., Dakar (SEN), 2016/12/13-15
RésuméThe coastal zone of the Gulf of Guinea is exposed to high-energy ocean swell generated in the South Atlantic. This zone is under both increasing societal pressure and the threat of coastal erosion. In order to understand the primary hydrodynamic and sediment processes along this stretch of coast, an intensive field campaign was conducted at Grand-Popo beach in Benin (12 to 19/03/2014). Flash rips current has been shown to occur repeatedly in this environment. This process is transient in both time and space, field data on it is scarce, with video monitoring appearing as a relevant approach to capture their dynamics on large temporal and spatial scales. In this study, we implemented a method based on image processing in order to detect the presence of rips, to extract their characteristics and to further link them to the forcing conditions. 434 events recorded in 7 days: the method is relevant for flash rip study. The preliminary results show more occurrence for low incidence in comparison to available conditions but not representative enough to conclude and we report an increasing littoral drift (as the incidence angle) makes the flash rip dissipate faster. Lastly, directional spreading increases the lifetime of flash rip but not the crossshore extension. The prespective are to improve in situ measurment method to detect suspended matter in rip and turbulence and generation mechanisms, to deploy two coupled ADCP of different frequencies and a colocated turbidimeter located in the flash rip neck will allow us to retrieve Reynold turbulent stresses components and to address the sediment grain size and concentration and lastly to make a proper statistical study on the available data.
Plan de classementLimnologie physique / Océanographie physique [032] ; Informatique [122] ; Sciences du milieu [021]
LocalisationFonds IRD [F A010071832]
Identifiant IRDfdi:010072152
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010072152

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 :

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)

Nouméa

Papeete

Niamey

Ouagadougou

Tunis

La Paz

Quito