Abstract
This paper presents the results from a new set of 3-D physical model tests performed in a 6.5 m wide flume at the Centre for Harbour and Coastal Studies in Madrid. These results will contribute to enhance the existing knowledge obtained in previous studies. Among other variables, they cover concrete-cubes armours and the submergence is increased, with a higher model scale. Damage criterions are discussed and proposed for both types of armour. The latter takes into account the different damage growth observed between rock and cubes-armours. Lower thresholds are proposed for cubes in order to increase the safety, though still allowing some movements before considering the damage is reached.
Highlights
Coastline stability in unbalanced beaches or new coastal developments is usually associated to protection works that aim at reducing the wave energy on the coast
Other geometrical parameters that were kept constant are slopes (3H/2V) and the crest width and height. This design was set in order to reach the initiation of destruction (Losada et al, 1986) or at least the intermediate damage for the most submerged structure
Regarding the first stages of damage, while most of the cubes fell down the rear slope without causing any damage on it, stones from the rock armour were displaced back and forward producing new displacements in the lower areas of the slopes
Summary
Coastline stability in unbalanced beaches or new coastal developments is usually associated to protection works that aim at reducing the wave energy on the coast. van der Meer (1988) tested a 2-D model of a Dn50 = 3.44 cm rock-armoured rubble-mound breakwater with slopes 2/1 at the seaside and 3/2 at the leeside, including the study of the wave steepness effect in the stability. Vidal et al (1992) tested a 3-D model of a 2.5 cm rock-armoured rubble-mound single detached breakwater with slopes 3/2 in order to study the stability of the different regions of the structure.
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