Experimental Study on the Scour around a Monopile in Breaking Waves

AbstractThe scour process around monopiles caused by breaking waves is studied experimentally using regular waves. The use of regular waves is conservative, which made it possible to avoid scour phenomena caused by nonbreaking waves such as scour generation and backfilling. The waves were breaking o...

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Bibliographic Details
Published in:Journal of waterway, port, coastal, and ocean engineering port, coastal, and ocean engineering, 2012-11, Vol.138 (6), p.501-506
Main Authors: Nielsen, Anders Wedel, Sumer, B. Mutlu, Ebbe, Sebastian Schjelde, Fredsøe, Jørgen
Format: Article
Language:English
Subjects:
Applied sciences
Breaking
Buildings. Public works
Earthwork. Foundations. Retaining walls
Energy
Exact sciences and technology
Exposure
Geotechnics
Hydraulic constructions
Marine
Natural energy
Ocean engineering
Offshore structure (platforms, tanks, etc.)
Piles
Sand
Scouring
Technical Note
Turbulence
Waterways
Wind energy
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Summary:AbstractThe scour process around monopiles caused by breaking waves is studied experimentally using regular waves. The use of regular waves is conservative, which made it possible to avoid scour phenomena caused by nonbreaking waves such as scour generation and backfilling. The waves were breaking on a flat sand section after shoaling on a mildly sloping ramp. Various monopiles were exposed to plunging breakers that were breaking at various distances from the pile. It was found that the scour was caused by turbulence generated by the breaking and was diverted toward the bottom by the pile. The maximum scour depth found was approximately 0.60D. This was smaller than the scour observed around piles exposed to current; however, in some cases it was an order of magnitude larger than the scour caused by nonbreaking waves. This is apparently especially true for larger piles.
ISSN:0733-950X
1943-5460
DOI:10.1061/(ASCE)WW.1943-5460.0000148