Clauss, Günther F.Günther F.ClaussStempinski, FlorianFlorianStempinskiKlein, MarcoMarcoKlein2020-01-232020-01-232008-12-01International Congress of the International Maritime Association of the Mediterranean, IMAM 2007: 693-700 (2008-12-01)http://hdl.handle.net/11420/4526For the analysis and simulation of loads and motions of marine structures in harsh seaways precise information about the hydrodynamics of waves are essential. In this paper extreme wave groups are generated and investigated experimentally by measurements of particle velocities using LDV (Laser Doppler Velocimetry) and dynamic pressures employing pressure transducers. The focus lies on the domain close to the elevated instantaneous water line where the highest uncertainties of conventional wave theories occur. The wave groups under consideration are realizations of extreme wave scenarios that are synthesized from real world measurements and transferred into the physical wave tank. In each case the target wave group is embedded - thus influenced - by a surrounding irregular seaway. The measurements are compared with results obtained byWAVETUB - a numerical wave tank using potential theory which is applied within a finite element approach. Further more the results are compared to wave theories of higher order to determine their accuracy and capability for modelling extreme irregular wave groups for offshore-design purposes. © 2008 Taylor & Francis Group, London.enConference PaperOther