Keywords
cage net
physical model
jacket type foundation
How to Cite
Abstract
The objective of this study is to investigate the suitable method for the integration of coastal cage net and the offshore wind farm as scour protection. Physical model tests with the scale of 1:36 are carried out in the Near-shore Wave Basin (NSWB) at Tainan Hydraulics Laboratory (THL) with the jacket type foundation and the combination of coastal cage net in the test area. The location in water depth 16m of the foundation is simulated in this study. From the fixed-bed experimental results, it shows that the up-current optimum location of coastal cage net in front of jacket type foundation can have a good effect to reduce current speed under the condition of distance between cage net and foundation being 2 times foundation width (W). However, the up-wave location of coastal cage net in front of jacket foundation, the wave attenuation effect near wind turbine foundation is not so obvious. From the fixed-bed experimental results, the optimum cage net depth is up to 0.75 water depth (3/4h, 12m cage net depth in-situ) for reducing current speed. After the fixed-bed experimental tests, the mobile experimental study on soft scour protection for the jacket type foundation of offshore wind turbine is further conducted.References
Backoff, R.W., and P.C. Nutt. 1988. A process for strategic management with specific application for the nonprofit organization, In Strategic Planning, Treats and Opportunities for Planners; Bryson, J.M., Einsweiler, R.C., Eds.; Planners Press: Chicago, IL, USA.
Borrini-Feyerabend, G., Farvar, M.T.; Nguinguiri, J.C.; Ndangang, V.A. Co-management of Natural Resources: Organising, Negotiating and Learning-by-Doing; GTZ and IUCN, Kasparek Verlag: Heidelberg, Germany, 2000.
Bryson, J.M. 1995. Strategic Planning for Public and Nonprofit Organizations, Jossey-Bass: San Francisco, CA, USA.
Buck, B.H. 2007. Experimental trials on the feasibility of offshore seed production of the mussel Mytilusedulis in the German Bight: installation, technical requirements and environmental conditions, Helgoland Mar. Res. 61, 81-101.
De Bruyn, C.A. 1988. Scour near platform pier due to current and breaking waves, (in Dutch), Dept. of Coastal Eng., Delft Univ. Technology, Deft, The Netherlands.
Den Boon, J.H., J. Sutherland, R. Whitehouse, R. Soulsby, C.J.M. Stam, K. Verhoeven, M. Hogedal, and T. Hald. 2004. Scour Behaviour and Scour Protection for Monopile Foundations of Offshore Wind Turbines, In Proceedings 2004 European Wind Energy Conference, London, UK. European Wind Energy Association [CD-ROM], 14 pp.
Hansen, E.A., H.J. Simonsen, A.W. Nielsen, J. Pedersen, and M. Høgedal. 2007. Scour protection around offshore wind turbine foundations, full-scale measurements., In Proceedings of the European Offshore Wind Conference, Berlin, Germany, 4-6 December 2007, 132-138.
Hudson, R.Y., F.A. Herrmann, R.A. Sager, R.W. Whalin, G.H. Keulegan, C.E. Chatham, and L.Z. Hales. 1979. Coastal Hydraulic Models, Special Report No. 5; U.S. Army Engineer Waterways Experiment Station: Vicksburg, MS, USA.
Hughes, S.A. 1993. Physical Models and Laboratory Techniques in Coastal Engineering, World Scientific: Singapore, Singapore.
Jentoft, S., T.C. Son, and M. Bjorkan. 2007. Marine Protected Areas: Agovernance System Analysis, Human Ecology, 35(5), 611-622.
Schachner, J. 2004. Power connections for offshore wind farms, Delft University/ University of Leoben, Delft/ Leoben, January.
Stahlmann, A., and T. Schlurmann. 2012. Investigations on Scour Development at Tripod Foundations for Offshore Wind Turbines: Modeling and Application, Coast. Eng. Proc., 1, doi:10.9753/icce. v33.sediment.90.
Sumer, B.M., J. Fredsøe, and N. Christiansen. 1992. Scour around vertical pile in waves, ASCE J. Waterw., Port, Coastal Ocean Eng. 118(1), 15-31.
Sumer, B.M., and J. Fredsøe. 2002. The Mechanics of Scour in the Marine Environment, World Scientific, Singapore.