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



Publications des scientifiques de l'IRD

Larnier S., Almar Rafaël, Cienfuegos R., Lejay A. (2014). On the use of the Radon transform to estimate longshore currents from video imagery. Journal of Coastal Research, (no spécial 70), 23-28. 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/si70-005.1

En Libre Accès sur HAL http://hal.inria.fr/hal-00917807

On the use of the Radon transform to estimate longshore currents from video imagery
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000338176100006
AuteursLarnier S., Almar Rafaël, Cienfuegos R., Lejay A.
SourceJournal of Coastal Research, 2014, (no spécial 70)p. 23-28. ISSN 0749-0208
ColloqueICS 2014 : International Coastal Symposium, Durban (ZFA), 2014/04/13-18
RésuméIn nearshore applications, the estimation of longshore currents is of primary importance since it controls the alongshore sediment transport and coastal evolution. Direct estimation of longshore currents using in-situ instruments is difficult and costly, especially under highly energetic wave climates. Low cost remote sensing systems based on video observations constitute a promising alternative when the drifting sea foam left after the passage of breaking waves is visible. In this paper we describe a method based on longshore timestacks that necessitates less data than approaches using the full video frames. Our approach uses the Radon transform applied on the time series derived from timestacks to produce an estimate of the longshore component of nearshore surface currents detected from the foam signature in video images. The Radon transform can be used to separate the wave crests from the drifting foam part. The identification of the longshore drift is enhanced with both a temporal and a spatial filters. The corresponding sinogram from the Radon transform is computed in order to find the angle of the alongshore drifting that is further converted into the longshore component of the surface currents. For the estimation of longshore currents, our approach is first tested using synthetic timestack examples created using anisotropic Gaussian random current fields. Comparisons between estimates derived by our algorithm and manual operator detection from videos are performed showing good agreement. These videos come from a field campaign conducted in the Mataquito River mouth area in the Maule region (Chile). Field test comparisons were also made against in situ current meter from the 2008 True Vert experiment in Aquitaine (France). It was taking place during an energetic event.
Plan de classementLimnologie physique / Océanographie physique [032] ; Télédétection [126] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
Descr. géo.CHILI ; FRANCE
LocalisationFonds IRD [F B010063189]
Identifiant IRDfdi:010063189
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010063189

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


Montpellier (centre IRD)

Montpellier (MSE)









La Paz