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TitleScour evolution around a vibrating monopile in cohesive beds
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorHendry, J A; Dix, J K; Thompson, C E L; Whitehouse, R J S; Harris, J M
SourceProgram and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; by Todd, B JORCID logo; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Geological Survey of Canada, Open File 8295, 2017 p. 57, Open Access logo Open Access
LinksGeoHab 2017
PublisherNatural Resources Canada
Meeting2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; May 1-4, 2017
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada
File formatpdf
Subjectsmarine geology; surficial geology/geomorphology; engineering geology; mapping techniques; oceanography; marine environments; coastal studies; resource management; energy resources; bathymetry; marine sediments; sands; soils; glacial deposits; tills; scouring; erosion; stress analyses; Wind energy; Phanerozoic; Cenozoic; Quaternary
ProgramOffshore Geoscience
Released2017 09 26
AbstractWith the advent of Offshore Wind Farms (OWF), energy security of many countries has the potential to progress towards self-sustainability. Early stages of offshore turbine installation took place in nearby post transgressional shallow sands. These locations were preferentially developed given their relative ease of installation, maintenance and supportive knowledge of granular soils. Fuelled by increased power generation with larger scale, and concerns of noise pollution and displeasing aesthetics, more recent stages of OWF development are entering deeper water. Cohesivity is commonly encountered within these environments of fine grained soils and consolidated tills. With little knowledge of scouring implications these sites are often over engineered, from calculations based on parameters orders of magnitudes too conservative.
This paper will discuss offshore cohesive soils and the initiation of floc erosion at critical bed stresses defined through geotechnical analysis dictating the temporal evolution of scour. Moreover, this study examines the potential impact of vibration, which at present is unknown, but is hypothesised to provide a critical plane of weakness directly adjacent to the monopile.
Using ArcGIS and MATLAB the cohesive bed locations are assessed. By extracting field CPT obtained from BGS, and the Marine Data Exchange, seabed parameters are chosen. These parameters are then scaled to a flume located at the University of Southampton and 4D photometry adopted for analysis of the spatial and temporal variation of the scour geometry. We evaluate the degree to which the turbine excitation affects the structure stability of the emplaced monopile and compare the effect on the seafloor bathymetry. These results are evaluated relative to Offshore Wind Farm field studies in the UK and in the East China Sea.
Summary(Plain Language Summary, not published)
The sixteenth annual GeoHab Conference was held this year (2017) at the Waterfront Campus of the Nova Scotia Community College in Dartmouth, Nova Scotia, Canada.

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