Focused wave generation in laboratory flumes over uneven bottom

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dc.identifier.uri Fernández, Hernan Venkatachalam, Sriram Schimmels, Stefan Budzik, Mariusz Oumeraci, Hocine 2016-12-21T12:08:59Z 2016-12-21T12:08:59Z 2014
dc.identifier.citation Fernández, H.; Venkatachalam, S.; Schimmels, S.; Budzik, M.; Oumeraci, H.: Focused wave generation in laboratory flumes over uneven bottom. In: Proceedings of the Coastal Engineering Conference 2014-January (2014), waves.32
dc.description.abstract A proper design of offshore and coastal structures requires further knowledge about extreme wave events. Such waves are highly nonlinear and may occur unexpectedly due to diverse reasons. One of these reasons is wave-wave interaction and the wave focusing technique represents one option to generate extreme wave events in the laboratory. The underlying mechanism is the superimposition and phasing of wave components at a predefined location. To date, most of the existing methods to propagate target wave profile backwards to the position of the wave generator apply linear wave theory. The problem is that the generated waves with different frequencies generate new components which do not satisfy the linear dispersion relation. As a result, small changes in the wave board control signal generally induce large and random shifts in the resulting focused wave. This means that iterations are necessary to get the required wave profile at the correct position in the flume. In this study, a Self Correcting Method (SCM) is applied to optimize the control signal of the wave maker in a Numerical Wave Tank (NWT). The nonlinearities are included in the control signal and accurate wave focusing is obtained irrespective of the prevailing seabed topography (horizontal or sloping) and type of structure (reflective or absorbing). The performance of the proposed SCM is numerically investigated for a wide variety of scenarios and validated by scale model tests in the Large Wave Flume (Großer Wellen Kanal, GWK), Hannover, Germany. The strengths and limitations of the proposed SCM are discussed, including the potential for further developments. eng
dc.description.sponsorship EC/FP7
dc.language.iso eng
dc.publisher Reston : American Society of Civil Engineers (ASCE)
dc.relation.ispartof 34th International Conference on Coastal Engineering, ICCE 2014, 15-20 June 2014
dc.relation.ispartofseries Proceedings of the Coastal Engineering Conference (2014)
dc.rights CC BY 3.0
dc.subject Extreme waves eng
dc.subject Nonlinear waves eng
dc.subject Numerical wave tank eng
dc.subject Self correcting method eng
dc.subject Tsunami generation eng
dc.subject Wave focusing eng
dc.subject Coastal engineering eng
dc.subject Control nonlinearities eng
dc.subject Focusing eng
dc.subject Tanks (containers) eng
dc.subject Numerical wave tanks eng
dc.subject Numerical methods eng
dc.subject.ddc 500 | Naturwissenschaften ger
dc.subject.ddc 550 | Geowissenschaften ger
dc.subject.ddc 510 | Mathematik ger
dc.title Focused wave generation in laboratory flumes over uneven bottom
dc.type article
dc.type conferenceObject
dc.type Text
dc.relation.issn 01613782
dc.bibliographicCitation.lastPage waves.32
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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