PHYSICAL MODELING OF SCOUR AROUND TRIPOD FOUNDATION STRUCTURES FOR OFFSHORE WIND ENERGY CONVERTERS
Proceedings of the 32nd International Conference
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Keywords

scour
offshore wind energy
tripod
large-scale physical modeling

How to Cite

Stahlmann, A., & Schlurmann, T. (2011). PHYSICAL MODELING OF SCOUR AROUND TRIPOD FOUNDATION STRUCTURES FOR OFFSHORE WIND ENERGY CONVERTERS. Coastal Engineering Proceedings, 1(32), sediment.67. https://doi.org/10.9753/icce.v32.sediment.67

Abstract

As a step to further develop the share of renewable energies, the first German offshore test site alpha ventus has been installed in the North Sea in 2009 in water depths of 30 m, where experience shall be gained and made available for future offshore wind farms. Regarding converter foundations in deep water, it is well known that in most cases scour phenomena occur around the structures. Due to the complexity of the tripod foundations, significant knowledge gaps in scour progression in general and especially in detail as well as its probable effects on the stability and durability are given. Therefore, investigations on scouring phenomena around complex foundation structures like the tripod are carried out within the research project. The investigation method consists of a unique combination of local scour monitoring as well as physical and numerical modeling, whereas the physical modeling part was carried by means of 1:40 laboratory tests and 1:12 large-scale physical model tests in wave flumes. The results show that scours around the tripod foundation do not only occur directly around the foundation piles, but also in the near-field of the structure. Compared to first in-situ measured scours in the test site, at least a good qualitative agreement of the modeled scour depths and evolutions could be shown.
https://doi.org/10.9753/icce.v32.sediment.67
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References

DHI. 2007. Borkum West - Hydrographische Standortbedingungen, Modellierung und Statistische Analyse. Abschlussbericht Rev. 2.2

Hoffmans, G.J.M.C., Verheij, H.J., 1997. Scour Manual. Balkema, Rotterdam

Lambers-Huesmann, M., Zeiler, M. 2010. Personal communication on scours measured in the German offshore test site alpha ventus

Rolfes, R., Huhn, H., Schaumann, P., Schlurmann, T., Lohaus, L., Achmus, M., Haake, G. 2008.

Support structures for offshore wind turbines - a holistic design concept, Leibniz University Hanover and Fraunhofer-CWMT Bremerhaven, DEWEK 2008

Stahlmann, A., Hildebrandt, A., Schlurmann, T. 2009. Investigations on Scour Development at Offshore Wind Energy Converters in the German Offshore Test Site alpha ventus, 33rd International Association of Hydraulic Engineering & Research (IAHR) Biennial Congress, Vancouver, pp. 3311-3318

Sumer, B.M., Freds√łe, J. 2002. The Mechanics of Scour in the Marine Environment, World Scientific Publishing Co. Pte. Ltd.

Whitehouse, R.J.S. 1998. Scour At Marine Structures - A Manual for Practical Applications, Thomas Telford Limited http://dx.doi.org/10.1680/sams.26551

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