Degradation of armour layer in a scour protection around a monopile exposed to waves

Anders W. Nielsen, Asbjørn U. Madsen, Brage R. S. Christiansen, Stefan Carstensen

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Abstract

A physical model test campaign on the stability and degradation of armour layers around monopiles exposed to waves has been conducted. The tests included various regular wave conditions, pile sizes and rock-based armour materials and provided a detailed picture of the deformation of the armour layer based on photogrammetry. The tests have shown that practically applicable rock gradations for armour layers will scour in the same way as a regular sediment bed under similar conditions both in terms of the scour process and the relative scour depth. In the case of very broad gradations the scour processes may alter for the given wave conditions but with no impact on the actual relative scour depth. Results also showed that the relative scour depth in part of the clear-water regime can exceed the expected live-bed scour depth by a factor of two to three.
Original languageEnglish
Title of host publicationProceedings of the 11th International Conference on Scour and Erosion
EditorsThor Ugelvig Petersen, Shinji Sassa
Number of pages11
PublisherInternational Society for Soil Mechanics and Geotechnical Engineering
Publication date2023
Publication statusPublished - 2023
Event11th International Conference on Scour and Erosion - Copenhagen, Denmark
Duration: 17 Sept 202321 Sept 2023

Conference

Conference11th International Conference on Scour and Erosion
Country/TerritoryDenmark
CityCopenhagen
Period17/09/202321/09/2023

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