Low-crested Offshore Breakwaters:
A Functional Tool For Beach Management
Author(s)
K. Spyropoulos & E. Andrianis
Abstract
Beach best quality is one of the main targets for resort hotels located near to or
by the sea. Offshore breakwaters are an alternative for coast protection against
erosion and/or the creation of pocket beaches, particularly at locations where the
tidal range is negligible or small. Such works can successfully function only
under specific combinations of wave, longshore and cross shore current,
bathymetry and quantity/quality of sediment. Hereunder the approach
methodology for the design of low-crested offshore breakwaters for two hotels in
Greece and Cyprus is described.
Keywords: offshore breakwaters, beach management, erosion control, coastal
protection.
1 Introduction
Offshore or detached breakwaters are used extensively for coast protection or the
creation of crescentic beaches with success particularly on coastlines where the
tidal range is negligible or small. The presence of a system of offshore
breakwaters influence the propagation of waves, causing partial wave breaking
on the breakwaters’ offshore slope, but also allow wave propagation only
through overtopping and diffraction between the gaps. This procedure results to
wave energy reduction at the lee side of the breakwaters as well as local patterns
of wave-induced currents. Consequently both alongshore and crossshore
sediment transport is reduced leading to sediment deposition and accretion in the
sheltered area between the structures and the shoreline. The target shoreline
configuration is the formation of a salient (an advance of the water line behind
the structure), or a tombolo (connection of the shoreline and the breakwaters).
Keywords
offshore breakwaters, beach management, erosion control, coastal
protection.
Related Book
Other papers in this volume
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