A New Symmetrical Unit for Breakwater Armour

First Tests

Conference paper (2015)
Department
Hydraulic Engineering (CEG) (TU Delft)
Copyright: © 2015 The Authors
Wave overtopping Armour unit Interlocking Crablock
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Published Date

30-11-2015

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Source:

Proceedings 7th Coastal Structures conference (ASCE-COPRI), Boston, USA 9-11 September 2015 (authors version)

Faculty

Civil Engineering and Geosciences

Department

Hydraulic Engineering

Abstract

A new and symmetrical single layer armour unit, the crablock, has been designed in the UAE. One breakwater was reconstructed with crablock, but very limited testing had been performed. Just to become more acquainted with this new unit, pre-competitive research at a university has been performed, which is the subject of this paper. Being a new armour unit, the placement was investigated first. Then physical model tests were performed in a wave flume to come up with results on stability and wave overtopping. Moreover, to determine the interlocking properties of armour units, pull tests were also conducted in this research. Those results are not part of this paper. Test results on stability showed that the longer waves affected the armour layer a little more, with larger movements and earlier displacements. Packing density as well as placement pattern showed no influence on wave overtopping. The overtopping tests gave larger overtopping than expected, which might be due to the fairly steep 1:30 foreshore.