Reef breakwater response to wave attack

A reef breakwater is a low-crested rubble-mound breakwater without the traditional multilayer cross section. This type of breakwater, in essence, is a homogeneous pile of stone with individual stone weights similar to those used in the armour and first underlayer of conventional breakwaters. Because of their high porosity, reef breakwaters are...

Hydraulic performance of berm breakwaters

Rubble mOlJnd breakwaters have been used for centuries for the protection of harbours. In many cases breakwaters were built in relatively deep water and exposed to waves too severe in relation to the size of rock used for construction. Furthermore, they were often built with a steep slope, and consequently, severe damage occurred. In some cases,...

Rock Armouring to unconventional breakwaters: The design implications for rock durability

This paper identifies the need for quantitative durability testing of rock for use on dynamically stable rock armoured 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 armour...

On the stability of berm breakwaters roundheads and trunk erosion of oblique waves

The stability of a berm type breakwater (sacrificial breakwater) was tested in a 3-dimensional model at rhe Hydraulics Laboratory, Department of civil Engineering, university of Aalborg. The object was to study the stability/erosion of the breakwater head and the trunk, the latter exposed to both head-on and oblique irregular waves. To avoid too...

Towards a better simulation of sea states for modelling of coastal structures

In the last fifteen years the techniques of wave generation 'have advanced to a great extent that it is row possible to exercise controls, on parameters such as wave grouping, wave asymmetries. etc .. , during the simulation process.. This paper describes some of these techniques that were developed at the National Research Council of Canada,...