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Field Performance of Scour Protection around Offshore Monopiles

Raaijmakers, T. C. / van Oeveren, M. C. / Rudolph, D. / Leenders, V. / Sinjou, W. C. P.

Offshore Windpark Egmond aan Zee was installed in 2006 and is the first Dutch offshore windpark. To guarantee a fixed seabed level, dynamic scour protections were installed at all 36 monopiles. Since installation 251 multibeam surveys were executed to investigate the as-built stages and yearly performance of the dynamic scour protection. After 4 major storms the onset of deformation was observed around the monopiles: rocks within 1 pile diameter from the pile centre are displaced to a ring within 1–1.5 pile diameter from the pile centre. The majority of the deformation, however, was attributed to overall compaction of the armour layer. Performance parameters based on two design formulae were calculated for the actual occurred hydrodynamics and compared with the observed deformation. Both predictions performed well, although there are differences in the sensitivity to the hydrodynamic parameters. Consequently, the ranking of the severity of the storms was different for both approaches.

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Field Performance of Scour Protection around Offshore Monopiles

Raaijmakers, T. C. / van Oeveren, M. C. / Rudolph, D. / Leenders, V. / Sinjou, W. C. P.

Offshore Windpark Egmond aan Zee was installed in 2006 and is the first Dutch offshore windpark. To guarantee a fixed seabed level, dynamic scour protections were installed at all 36 monopiles. Since installation 251 multibeam surveys were executed to investigate the as-built stages and yearly performance of the dynamic scour protection. After 4 major storms the onset of deformation was observed around the monopiles: rocks within 1 pile diameter from the pile centre are displaced to a ring within 1–1.5 pile diameter from the pile centre. The majority of the deformation, however, was attributed to overall compaction of the armour layer. Performance parameters based on two design formulae were calculated for the actual occurred hydrodynamics and compared with the observed deformation. Both predictions performed well, although there are differences in the sensitivity to the hydrodynamic parameters. Consequently, the ranking of the severity of the storms was different for both approaches.

Field Performance of Scour Protection around Offshore Monopiles

Raaijmakers, T. C. / van Oeveren, M. C. / Rudolph, D. / Leenders, V. / Sinjou, W. C. P.

Offshore Windpark Egmond aan Zee was installed in 2006 and is the first Dutch offshore windpark. To guarantee a fixed seabed level, dynamic scour protections were installed at all 36 monopiles. Since installation 251 multibeam surveys were executed to investigate the as-built stages and yearly performance of the dynamic scour protection. After 4 major storms the onset of deformation was observed around the monopiles: rocks within 1 pile diameter from the pile centre are displaced to a ring within 1–1.5 pile diameter from the pile centre. The majority of the deformation, however, was attributed to overall compaction of the armour layer. Performance parameters based on two design formulae were calculated for the actual occurred hydrodynamics and compared with the observed deformation. Both predictions performed well, although there are differences in the sensitivity to the hydrodynamic parameters. Consequently, the ranking of the severity of the storms was different for both approaches.

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Titel:

Field Performance of Scour Protection around Offshore Monopiles

Beteiligte:

Raaijmakers, T. C. (Autor:in) / van Oeveren, M. C. (Autor:in) / Rudolph, D. (Autor:in) / Leenders, V. (Autor:in) / Sinjou, W. C. P. (Autor:in)

Kongress:

International Conference on Scour and Erosion (ICSE-5) 2010 ; 2010 ; San Francisco, California, United States

Erschienen in:

Scour and Erosion ; 428-439

Erscheinungsdatum:

29.10.2010

ISBN:

DOI:

https://doi.org/10.1061/41147(392)41

Medientyp:

Aufsatz (Konferenz)

Format:

Elektronische Ressource

Sprache:

Englisch

Schlagwörter:

Piles , Europe , Slope stability , Numerical models , Offshore structures , Infrastructure , Case studies , Coastal environment , Scour , Soil erosion , Wind power

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