| Titre | Scour evolution around a vibrating monopile in cohesive beds |
| Télécharger | Téléchargement (publication entière) |
| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Hendry, J A; Dix, J K; Thompson, C E L; Whitehouse, R J S; Harris, J M |
| Source | Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; par Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Commission géologique du Canada, Dossier public 8295,
2017 p. 57, https://doi.org/10.4095/305857 (Accès ouvert) |
| Liens | GeoHab 2017
|
| Année | 2017 |
| Éditeur | Ressources naturelles Canada |
| Réunion | 2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; mai 1-4, 2017 |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/305857 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Todd, B J;
Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; (2017). Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada, Commission géologique du Canada, Dossier public 8295 |
| Formats | pdf |
| Sujets | techniques de cartographie; océanographie; milieux marins; études côtières; gestion des ressources; ressources énergétiques; bathymétrie; sédiments marins; sables; sols; dépôts glaciaires; tills;
affouillement; érosion; détermination des contraintes; énergie éolienne; géologie marine; géologie des dépôts meubles/géomorphologie; géologie de l'ingénieur; Phanérozoïque; Cénozoïque; Quaternaire |
| Programme | Géoscience en mer, Géoscience de la gestion des océans |
| Diffusé | 2017 09 26 |
| Résumé | (disponible en anglais seulement)
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. |
| GEOSCAN ID | 305857 |
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