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Scour evolution around a vibrating monopile in cohesive beds

Authors: J A Hendry; J K Dix; C E L Thompson; R J S Whitehouse; J M Harris;

Scour evolution around a vibrating monopile in cohesive beds

Abstract

With 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.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
hybrid