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Webinar Morphodynamics and scour mitigation HKN WFZ

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    23-05-2019 10:00:00 23-05-2019 11:30:00 Europe/Amsterdam Webinar Morphodynamics and scour mitigation HKN WFZ Introduction: Tim Raaijmakers and Tom Roetert (Deltares) will guide you through the assessment of the seabed dynamics and scour mitigation strategies at the HKNWFZ. The study is based on existing historical bathymetrical data and the survey results obtained in the geophysical campaign. A panel of the following experts: Tim Raaijmakers, Tom Roetert (Deltares), Ben de Sonneville (BLIX) and Cynthia Mors (Netherlands Enterprise Agency) will be present to answer any questions on the morphodynamics... noreply DD-MM-YYYY
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By WOZ_RVO.nl 34 days ago
23-05-2019 10:00
23-05-2019 11:30

Introduction: Tim Raaijmakers and Tom Roetert (Deltares) will guide you through the assessment of the seabed dynamics and scour mitigation strategies at the HKNWFZ. The study is based on existing historical bathymetrical data and the survey results obtained in the geophysical campaign.

A panel of the following experts: Tim Raaijmakers, Tom Roetert (Deltares), Ben de Sonneville (BLIX) and Cynthia Mors (Netherlands Enterprise Agency) will be present to answer any questions on the morphodynamics and scour mitigation.

Supplier: Research institute Deltares

Result of this study: The bathymetry in the HKNWFZ has a non-uniform morphology including a number of prominent sand banks and a partial cover of sand waves with megaripples on top. The sand waves are migrating towards the north-northeast. Considering the entire HKNWFZ, the sand waves have wavelengths in the range of 190 to 500 m, heights of 0.8 to 2.8 m and migration speeds up to 5.4 m/year with a median speed of 3.2 m/year. An analysis of the large-scale seabed variations shows the underlying seabed may be considered static over the lifetime of the wind farm.
To decide which strategy for scour mitigation can best be adopted for a certain foundation type and specific location, information was presented on how to predict the scour depth (when not protected) and how to protect against scour, taking into account the morphodynamic scenarios of stable, lowering, and rising seabeds.
It can be concluded that for monopiles an easy-applicable, well-proven solution is to place the monopiles 1) in areas with limited seabed dynamics; 2) just north-east of the sand wave crests; or 3) on top of the sand wave crests and to apply a scour protection to maintain a more or less fixed seabed level around the foundation. In the second case, a slightly longer pile is needed, while, in the third case, a longer or thicker scour protection is recommended to cater for the lowering seabed.

The report of this study: Is published on: https://offshorewind.rvo.nl/soilnh

Preparations webinar: Please register at least one day in advance to woz@rvo.nl. You will receive a link to the webinar.

Please read these instructions prior to the webinar, in order to be prepared to ask questions. The webinar will be held on an anonymous internet platform, so your questions will not be traceable to you or your company.