Rock Armouring to Unconventional Breakwaters: The Design Implications for Rock Durability

by N. W. H. Allsop, Hydraulics Research Ltd, United Kingdom,
J. P. Latham, Hydraulics Research Ltd, United Kingdom,

Document Type: Proceeding Paper

Part of: Berm Breakwaters: Unconventional Rubble-Mound Breakwaters


This paper identifies the need for quantitative durability testing of rock for use on dynamically stable rock armored slopes. The derivation and use of a suite of engineering tests for rock quality is considered, and the limitations of simple accept/reject criteria discussed. Recent developments in techniques for the quantification of armor slope profiles and armor unit shapes are presented. The use of a roller mill test to predict rock abrasion performance is discussed. The paper describes the use of advanced techniques to predict rock armor performance, allowing for long term reductions in armor unit size and roundness. The paper seeks to provide a framework within which to study the inter-relationships between wave climate, armor design, rock wear resistance, and weight loss and rounding in service.

Subject Headings: Riprap | Breakwaters | Rocks | Wave climates | Water waves | Material tests | Erosion | Armor units

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