Stability of Rock Armour Under Random Wave Attack: Performance of Non-Standard Rock Shapes and Gradings

by A. P. Bradbury, Coast Protection Group, Lymington, United Kingdom,
N. W. H. Allsop, Coast Protection Group, Lymington, United Kingdom,

Document Type: Proceeding Paper

Part of: Durability of Stone for Rubble Mound Breakwaters


Quarried rock is frequently used to protect coastal and shoreline structures against wave attack. Armour rock specifications generally exclude rock that is rounded or tabular, and gradings that include a wide range of sizes. These restrictions sometimes have a significant influence on the cost of producing the armour. This paper presents results from 2 series of hydraulic model tests carried out to measure the comparative stability of different rock shape types, and the effect of wide gradings, up to D85/D18=4. Damage measured in these tests has been compared with damage predicted by van der Meer's stability formulae. Modifications to the standard formulae are suggested to describe the influences of armour shape and layer thickness on damage. The effects of wide gradings on armour damage are also discussed.

Subject Headings: Random waves | Riprap | Rocks | Hydraulic models | Ocean waves | Shoreline | Comparative studies | Vehicles

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