Publications des scientifiques de l'IRD

Almar Rafael, Catalan P., Ibaceta R., Blenkinsopp C., Cienfuegos R., Villagran M., Aguilera J.C., Castelle B. (2014). Swash zone based reflection during energetic wave conditions at a dissipative beach : toward a wava-by-wave approach. In : Lynett P. (ed.). International Conference on Coastal Engineering (ICCE). Coastal Engineering Proceedings, (34), 9 p. International Conference on Coastal Engineering (ICCE), 34., Séoul (KOR), 2014/06/15-20. ISBN 978-0-9896611-2-6. ISSN 2156-1028.

Titre du document
Swash zone based reflection during energetic wave conditions at a dissipative beach : toward a wava-by-wave approach
Année de publication
2014
Type de document
Article
Auteurs
Almar Rafael, Catalan P., Ibaceta R., Blenkinsopp C., Cienfuegos R., Villagran M., Aguilera J.C., Castelle B.
In
Lynett P. (ed.), International Conference on Coastal Engineering (ICCE)
Source
Coastal Engineering Proceedings, 2014, (34), 9 p. ISBN 978-0-9896611-2-6 ISSN 2156-1028
Colloque
International Conference on Coastal Engineering (ICCE), 34., Séoul (KOR), 2014/06/15-20
This paper presents a 11-day experiment conducted at the high-energy dissipative beach of Mataquito, Maule Region, Chile. During the experiment, offshore significant wave height ranged 1-4 m, with persistent long period up to 18 s and oblique incidence. Wave energy reflection value ranged from 1 to 4 %, and results show that it is highly linked to both incoming wave characteristics and swash zone beach slope, and is well correlated to a swash-slope based Iribarren number. The swash acting as a low-pass filter in the reflection mechanism, our results show that the cut-off period is better determined by swash slope rather than incoming wave's period. A new low cost technique for observing high-frequency swash hydro-morphodynamics is introduced and validated using LIDAR measurements. A good agreement is found. Separation of uprush and backswash components using the Radon Transform illustrates the low-frequency filtering effect. These results show the key role played by swash mechanism in the reflection rate and frequency selection. More investigation is needed to describe the reflection process and its link with shoreface evolution, moving toward a swash-by-swash approach.
Plan de classement
Dynamique des eaux [032DYNEAU] ; Océanographie [126TELAPP05]
Descripteurs
ZONE COTIERE ; LITTORAL ; PLAGE ; ZONE INTERTIDALE ; HYDRODYNAMIQUE ; ONDE MARINE ; PENTE ; GEOMORPHOLOGIE ; METHODE D'ANALYSE ; TELEDETECTION ; VIDEO ; LASER
Description Géographique
CHILI
Localisation
Fonds IRD [F B010064310]
Identifiant IRD
fdi:010064310
Contact