Experimental investigation of the spatial and temporal variation of rocking armour units

Rocking Revisited V

Master thesis (2020)

Authors

D. Houtzager Civil Engineering & Geosciences

Contributors

Bas Hofland Hydraulic Structures and Flood Risk - CEG (supervisor 1)
A. Antonini Coastal Engineering - CEG (supervisor 2)
R.W. Hut Water Resources - CEG (supervisor 2)
Marcel R. A. van Gent Deltares (coach)
Cock van der Lem Royal HaskoningDHV (coach)
Pieter Bakker Delta Marine Consultants (coach)
Faculty
Civil Engineering & Geosciences
Copyright: © 2020 Daan Houtzager
Coastal Engineering Physical model tests Breakwater Armour layer Rocking Impact velocity Concrete armour unit Single layer armour unit Smart Xbloc
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Published Date

20-07-2020

Language

English

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Faculty

Civil Engineering & Geosciences

Abstract

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 breakage. This is especially important for single layer armour units, like the Xbloc. The development of the smart Xbloc makes it possible to measure accelerations and angular velocity with a stand alone sensors at a sampling frequency of around 100 Hz. The current literature does not provide the spatial distribution of the number of impacts and the impact velocities due to rocking. Furthermore, only limited knowledge is available on the distribution in time. The research aim of this thesis is: Determining the spatial and temporal distribution of the number of moving armour units, the number of impacts and the impact velocity of rocking armour units. To achieve this aim a physical scale model was set up and model tests have been performed with 10 smart Xbloc units to measure rocking. The collected data, analysis and results provide a unique look into the behaviour of single layer armour units. The results can be used to validate rocking models and provide valuable statistical information on the number of impacts and the impact velocities.