Coastalock™ Performance on a Permeable Breakwater Slope: Model Tests on the Influence of a Permeable Core, Unit Modifications and Toe Support on the Hydraulic Performance of an Ecological Armour Unit

Coastal areas face increasing threat from erosion. The use of coastal protection structures is imperative to counter this. Concrete “armouring” is widely used due to durability and cost-effectiveness. Conventional methods of “armouring” result in habitat degradation and loss of biodiversity. ECOncrete developed Coastalock, an armour unit...

Experimental investigation of the spatial and temporal variation of rocking armour units: Rocking Revisited V

The purpose of this MSc thesis is to do an experimental study into the spatial and temporal variation of rocking armour units. Armour units on a breakwater slope under wave loading can sometimes start to move back and forth, this phenomenon is known as rocking. Rocking can lead to significant impacts between armour units, which can result in...

Rocking of single layer armour units: Rocking revisited 3

After the failure of several large breakwaters in late 1970’s and early 1980’s where the role of rocking and breakage of armour became apparent, the importance of understanding this rocking phenomenon is given a great emphasis. Single layer randomly placed armour units are widely used in breakwater designs as they are more economical due to the...

Stability of Single-Layer Cubes on Lee-Side of Breakwaters: Quantative Research on the Stability of a Single Cubic Armour Layer on the Lee-Side of Breakwaters using a Wave Overtopping Simulator

Breakwaters are hydraulic structures used to create calm and steady environments for moored ships in harbors. They dampen the wave by dissipating the energy through wave breaking. Most studies of breakwaters have only been carried out on the seaward slope of the structure. However, few have conducted research on the landward-, inner-, slope of...

Rear-Slope Revetment Stability Approached by the Wave Overtopping Simulator: Experiments Regarding the Stability of Single-Layer Cube Revetment on Breakwater Crests and Rear Slopes

Contrary to a breakwater outer slope, rear-slope revetment does not have to withstand breaking waves. However, generally, an equal dimensioned revetment is used on both the inner- and outer slope. Although with low-crested breakwaters severe overtopping occurs, the application of similarly sized armour on both sides still results in an over...

Rocking Revisited 1: Rocking of a Singe Cube on a Breakwater Slope

Prototype single layer armour units on a breakwater slope are observed to break. To predict when breakage occurs, the objective of this research project is to obtain knowledge on, and measurements of the rocking behaviour and failure mode of single layer armour units. A single cube on a breakwater slope is subjected to investigations. An...

Physical model tests on stability and interlocking of new breakwater armour block Crablock

The protection of breakwater structures is in this research considered. The design of rubble mound concrete armour layers for breakwaters can be divided in a single layer system and a double layer system. The single layer system is nowadays mostly applied because of the high interlocking, high stability of the structure, reduction of concrete...

Golfbrekers met een enkele toplaag

Na analyse van de resultaten van de modelproeven zijn de volgende criteria voor Tetrapoden in een enkele toplaag bepaald: Bezwijken Ns=1,2; Start van Schade Ns=1,2 Geen Schade Ns=0.8. Ns is hierbij het schadegetal (golfhoogte gedeeld door relatieve dichtheid en blokdiameter) Na vergelijking van deze criteria met de ontwerpformule voor Tetrapoden...