THE INFLUENCE OF OBLIQUE REFLECTION ON BREAKWATERS

Richard Silvester

Abstract


The degree of reflection from rubble-mound breakwaters, even those comprising large pre-cast concrete armour units is greater than is usually thought. This is because the bulk of the face consists of smaller stones where water exchange in voids is minimal. Theory and experiment have shown that for 100% reflection of oblique waves the orbital motions are very complex, varying across the crest length of the short-crested system from rectilinear oscillation to circular or vortex motion. Also the influence of these high velocity orbital motions on a sedimentary bed have been shown to have a high scouring capacity. This has been exhibited in hydraulic models and in the field.

Keywords


breakwater; oblique reflection; reflection

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