Author(s): Ole Juul Jensen; Torben Sørensen

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Abstract: In 1984, a berm breakwater built the same year on the island of St. Paul was completely destroyed in two serious storms. The breakwater roundhead was constructed with a profile similar to that of the trunk and - because of lack of large rocks - with rocks of the same size as on the trunk. Three-dimensional model tests to a scale of 1 : 41 made after the failure showed that when a berm breakwater roundhead is damaged, the damage develops in a way that is completely different than is the case for a traditional rubble mound roundhead. Furthermore, the rate of development of the damage does not appear to be increased when core material is exposed in the upper part of the breakwater. The tests have led to the conclusion that the cause of the failure was that the breakwater was constructed from substantially undersized rock as compared with recommendations. Ideas for future research are presented.

DOI: https://doi.org/10.1080/00221689109498961

Year: 1991