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The effects of dredging operations on the hydrodynamics of an ebb tidal delta: Oka Estuary, northern Spain

Record type: Article

The hydrodynamics associated with the Mundaka Sandbar are described. The sandbar (ebb tidal delta) is responsible for the formation and the quality of a “world famous” surfing wave, at the mouth of the Oka Estuary in the Urdaibai Biosphere Reserve. The primary factor controlling the shape of the sandbar is the shoreline configuration. In turn the size of the sandbar is controlled by the volume of the tidal outflow and the wave energy. Periods of tidal dominance occur during summer (associated with sandbar accretion); with mixed energy conditions during winter and wave dominance under storms (sandbar erosion).

The surfing wave lost its characteristics following, intensive dredging along the estuary, combined with beach nourishment, in May 2003. Between May 2005 and April 2006, the outer part of the estuary was monitored, to understand the processes controlling recent morphological changes over the area.

Recent studies undertaken in the mouths of estuaries, together with the results of the monitoring are described; these are complemented by the numerical modelling of wave hydrodynamics under medium and extreme sea states. Analyses of the wave and current survey data, combined with the modelling outputs, have demonstrated that the changes were not irreversible. As such, the natural shape of the sandbar has recovered gradually, as has the quality of the Mundaka surfing wave.

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Citation

Liria, P., Garel, E. and Uriarte, A. (2009) The effects of dredging operations on the hydrodynamics of an ebb tidal delta: Oka Estuary, northern Spain Continental Shelf Research, 29, (16), pp. 1983-1994. (doi:10.1016/j.csr.2009.01.014).

More information

Published date: 15 September 2009
Additional Information: Special issue in honour of Michael Collins.
Keywords: Waves, Sediment, Sandbar, Coastal morphology, Estuary, Hydrodynamics, Ebb delta, Tidal delta, Inlet, Surfing

Identifiers

Local EPrints ID: 68938
URI: http://eprints.soton.ac.uk/id/eprint/68938
ISSN: 0278-4343
PURE UUID: f0b58b93-dc96-4479-9b47-824749648fa7

Catalogue record

Date deposited: 09 Oct 2009
Last modified: 19 Jul 2017 00:15

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Contributors

Author: P. Liria
Author: E. Garel
Author: A. Uriarte

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