Resumen

MARTINEZ, Carolina  y  SALINAS, Sergio. Morphodynamics and recent evolution in Tunquen beach, central Chile. Rev. biol. mar. oceanogr. [online]. 2009, vol.44, n.1, pp. 203-215. ISSN 0718-1957.  doi: 10.4067/S0718-19572009000100021.

ABSTRACT The morphodynamic of Tunquen beach, distal zone of Algarrobo headland bay, central Chile, and its relationship with both, the relative shoreline changes in the mid-term scale and pocket beach conditions, are presented. Tunquen is an intermediate high-energy beach, with transverse bar and rip. A rhythmic topography produced by equidistant megacusps is associated to swash circulations patterns (horn divergent). Sediments correspond to a well classified medium to coarse sand. During the last 45 years, the relative position of the shoreline has shown small variability (± 50 m). This embayment presents stable conditions associated to the shoreline changes and the determined beach type.

Palabras clave : Pocket beach; beach cusp; rhythmic morphology; shoreline.