Publications des scientifiques de l'IRD

Aucan Jerôme, Vendé-Leclerc Myriam, Dumas Pascal, Bricquir Marianne. (2017). Wave forcing and morphological changes of New Caledonia lagoon islets : insights on their possible relations. Comptes Rendus Geoscience, 349 (6-7), p. 248-259. ISSN 1631-0713.

Titre du document
Wave forcing and morphological changes of New Caledonia lagoon islets : insights on their possible relations
Année de publication
2017
Type de document
Article référencé dans le Web of Science WOS:000417625700004
Auteurs
Aucan Jerôme, Vendé-Leclerc Myriam, Dumas Pascal, Bricquir Marianne
Source
Comptes Rendus Geoscience, 2017, 349 (6-7), p. 248-259 ISSN 1631-0713
In the present study, we examine how waves may contribute to the morphological changes of islets in the New Caledonia lagoon. We collected in situ wave data to investigate their characteristics. Three types of waves are identified and quantified: (1) high-frequency waves generated within the lagoon, (2) low-frequency waves originating from swells in the Tasman Sea, and (3) infragravity waves. We found out that high-frequency waves are the dominant forcing on the islets during typical wind events throughout the year, while infragravity waves, likely generated by the breaking of low-frequency waves, dominate during seasonal swell events. During swell events, low-frequency waves can also directly propagate to the islets through channels across the barrier reef, or be tidally modulated across the barrier reef before reaching the islets. Topographic surveys and beach profiles on one islet indicate areas with seasonal morphological changes and other areas with longer, interannual or decadal, erosion patterns. Although more data are needed to validate this hypothesis, we suspect that a relation exists between wave forcing and morphological changes of the islets.
Plan de classement
Limnologie physique / Océanographie physique [032] ; Géologie et formations superficielles [064]
Description Géographique
NOUVELLE CALEDONIE
Localisation
Fonds IRD [F B010071889]
Identifiant IRD
fdi:010071889
Contact