Cienfuegos R., Villagran M., Aguilera J. C., Catalan P., Castelle B., Almar Rafaël. (2014). Video monitoring and field measurements of a rapidly evolving coastal system : the river mouth and sand spit of the Mataquito River in Chile. Journal of Coastal Research, (no spécial 70), p. 639-644. ICS 2014 : International Coastal Symposium, Durban (ZFA), 2014/04/13-18. ISSN 0749-0208.
Titre du document
Video monitoring and field measurements of a rapidly evolving coastal system : the river mouth and sand spit of the Mataquito River in Chile
Cienfuegos R., Villagran M., Aguilera J. C., Catalan P., Castelle B., Almar Rafaël
Source
Journal of Coastal Research, 2014,
(no spécial 70), p. 639-644 ISSN 0749-0208
Colloque
ICS 2014 : International Coastal Symposium, Durban (ZFA), 2014/04/13-18
The understanding of morphological processes controlling the evolution of sand spit reformation after a tsunami impact is a challenging and interesting topic, especially in highly energetic and micro tidal environments. A field campaign performed during December 2012 at the Mataquito River mouth in Chile, allowed us to simultaneously monitor topobathymetry evolution, wave climate, tidal range, swash zone dynamics and upper beach face evolution over a portion of its sand spit. A video system was set up for a continuous and long-term monitoring of the evolution of the river mouth and sand spit. Primarily, in this work we focus on the application of a video-derived shoreline detection method to assess shoreline evolution and beach cusps migration at hourly scales. We test the method performance on short-term episodic migration of beach cusps recorded during the campaign. Beach face variations at a daily scale were observed, which can be attributed to the migration of beach cusps in the alongshore direction, and linked to wave forcing and alongshore sediment transport.
