Resultados preliminares de la operación de realimentación de la península de Cacela (sur de Portugal)
Cacela Peninsula, located on the eastern edge of the Ria Formosa barrier island system (southern Portugal), had a very low-breached and poorly-vegetated dune field. During the winter of 1995/1996, several overwashes occurred, which led to the opening of a new inlet. After this event, a major dune re...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2001 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/319200 |
| Acceso en línea: | http://hdl.handle.net/10261/319200 |
| Access Level: | acceso abierto |
| Palabra clave: | Medio Marino Realimentación duna dinámica de playa península de Cacela (sur de Portugal) |
| Sumario: | Cacela Peninsula, located on the eastern edge of the Ria Formosa barrier island system (southern Portugal), had a very low-breached and poorly-vegetated dune field. During the winter of 1995/1996, several overwashes occurred, which led to the opening of a new inlet. After this event, a major dune replenishment of 325 000 m³ of sediment was begun. To evaluate the replenishment's effect on beach behaviour, a monitoring program was established consisting of monthly profile surveys at sites located both in the replenished area (5 sites) and eastwards of this area (3 sites). Two topographic maps made immediately pre- and post-replenishment, were used for volume comparisons between sites, together with profile surveys. The Levante erosive event that occurred in March 1997 was responsible for erosion of about 10 % of the total replenishment. This erosion was more pronounced at sites 2 and 3, the most prominent places of the replenished area. After this event, no major volume changes were observed in the replenished area's subaerial beach during the period studied (February 1997-August 1997). Eastwards of this area some accretion occurred, which was not necessarily related to the replenished sediments' erosion. The replenished area's beach profiles showed relatively slow evolution from a generally dissipative profile (winter 1997) to a berm-type profile (summer 1997). For non-replenished areas of the peninsula, this evolutionary trend was less evident. In light of the present data, a readjustment of the profile is expected, including probable new bluff retreat on the prominent sites. |
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