Publicaciones

Video monitoring and field measurements of a rapidly evolving coastal system: The river mouth and sand spit of the Mataquito river in Chile

Journal

Journal of Coastal Research

Institución

Pontificia Universidad Católica de Chile, Universidad Técnica Federico Santa María

Disciplina

Ingeniería Civil

afiliacion

  1. Rodrigo Cienfuegos, racienfu@ing.puc.cl, Pontificia Universidad Católica de Chile. Centro Nacional de Investigación para la Gestión Integrada de Desastres Naturales (CIGIDEN), Pontificia Universidad Católica de Chile
  2. Mauricio Villagran, mvillagranv@uc.cl / mvillagran@ucsc.cl, Pontificia Universidad Católica de Chile. Departamento de Ingeniería Civil, Universidad Católica de la Santísima Concepción, UCSC.
  3. Juan C. Aguilera, Pontificia Universidad Católica de Chile
  4. Patricio Catalán, patricio.catalan@usm.cl, Departamento de obras civiles, Universidad Técnica Santa María, Valparaíso, Chile. Centro Nacional de Investigación para la Gestión Integrada de Desastres Naturales (CIGIDEN), Pontificia Universidad Católica de Chile
  5. Bruno Castelle, b.castelle@epoc.u-bordeaux1.fr, EPOC- OASU, University the Bordeaux, Bordeaux, France
  6. Rafael Almar, rafael.almar@ird.fr, Institut de Recherche pour le développement (IRD)/ LEGOS, Toulouse, France

Abstract

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 topo-bathymetry 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.

Keywords

Coastal monitoring, video system, river mouth, sand spit, beach cusps migration

Link

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