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To that end, Deltares has teamed up with the corporate sector and other top research institutes certifying bodies to launch a Joint Industry Project: JIP Handbook Scour and cable PROtection (JIP HaSPro). In JIP HaSPro a generic, science-based and systematic comparison is made between different scour protection methods. This comparison is aimed at optimizing existing methods, testing new methods and providing recommendations/guidelines on when and where to apply which method. This comparison is based on an extensive model test programme performed in Deltares' facilities, the scale of which ranges from 1:50 to 1:1, including the world's largest wave flume "(Delta flume"Flume).
Scour protection methods
In JIP HaSPRo we focus on three scour protection methods. First, conventional (loose) rock protection methods are considered against scour around monopile foundations or cable crossing failures. For these -relatively well understood methods- we focus on aim at filling the gaps of available datasets, by testing a large range of hydrodynamic conditions as well as many different rock grading designs. Furthermore, we conducted gradings. We conduct model tests to investigate all possible failure mechanisms of the conventional rock protection methods; we focused are focusing on external stability (movement of rock at or away from the scour protection), internal stability (winnowing of underlying sand through the scour protection layer) as well as flexibility (falling apron behavior) of loose rock scour protections.
Furthermore Additionally, within the JIP HaSPro scope, we test and assess many innovative protection methods have been tested in experimental conditions, some of them for the first time, to provide us with alternative solutions to help reduce the costs by simplifying the installation phase, facilitate monopile decommissioning and finally protect against scour, infrastructure that is situated in highly dynamic environments where extreme morphological changes and hydrodynamic conditions are expected. Such Examples of such innovative scour protection methods include are concrete block mattresses, gabions, artificial vegetation, ballast-filled mattresses and self-installable systems.
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This joint industry project is supported by two consortia for knowledge and innovation (Topconsortia voor Kennis en Innovatie), namely TKI-Wind op Zee and TKI-Deltatechnologie. Moreover, it has the consortium consists of 21 participants from the full spectrum of offshore wind industry including contractors, utilities, engineering firms, suppliers, a certifying body and a research institute.
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The deliverables of the JIP HaSPro include new design formulae, an online digital handbook of best practices and an engineering software tool for the considered scour protection methods in this Joint Industry Projectduring this research project. Moreover, a large database with model test results, containing 3D-data of scour protection layouts and deformation patterns, as well as a 3D-viewer to visualize these results are part of included in the deliverables of this JIPJoint Industry Project.
Timeline
JIP HaSPro was initiated in 1-9-2016 and will be in progress until 1-6-2020. Results will be confidential for a certain period which typically is 2 years.
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