Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 34th International Conference on Coastal Engineering, ICCE 2014 |
| Editors | Patrick Lynett |
| Publisher | American Society of Civil Engineers (ASCE) |
| ISBN (electronic) | 9780989661126 |
| Publication status | Published - 28 Oct 2014 |
| Event | 34th International Conference on Coastal Engineering, ICCE 2014 - Seoul, Korea, Republic of Duration: 15 Jun 2014 → 20 Jun 2014 |
Publication series
| Name | Proceedings of the Coastal Engineering Conference |
|---|---|
| Volume | 2014-January |
| ISSN (Print) | 0161-3782 |
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.
Keywords
- Extreme waves, Nonlinear waves, Numerical wave tank, Self correcting method, Tsunami generation, Wave focusing
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Ocean Engineering
- Earth and Planetary Sciences(all)
- Oceanography
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Proceedings of the 34th International Conference on Coastal Engineering, ICCE 2014. ed. / Patrick Lynett. American Society of Civil Engineers (ASCE), 2014. (Proceedings of the Coastal Engineering Conference; Vol. 2014-January).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Focused wave generation in laboratory flumes over uneven bottom
AU - Fernández, Hernán
AU - Venkatachalam, Sriram
AU - Schimmels, Stefan
AU - Budzik, Mariusz
AU - Oumeraci, Hocine
N1 - Funding Information: This research is funded by EC through the seventh framework programme, particularly the work presented here belongs to the HydralabIV project within the joint research activity HyReS (Hydraulic Response of Structures). The authors are grateful to the WAVESLAM project, a consortium coordinated by the University of Stavanger, Norway (Prof. Ove T. Gudmestad) and the Norwegian University of Science and Technology, Trondheim, Norway (Prof. Øivind A. Arntsen). Dr. Sriram is grateful to Alexander von Humboldt foundation, Germany for his stay at Hannover.
PY - 2014/10/28
Y1 - 2014/10/28
N2 - 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.
AB - 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.
KW - Extreme waves
KW - Nonlinear waves
KW - Numerical wave tank
KW - Self correcting method
KW - Tsunami generation
KW - Wave focusing
UR - http://www.scopus.com/inward/record.url?scp=84957655301&partnerID=8YFLogxK
U2 - 10.9753/icce.v34.waves.32
DO - 10.9753/icce.v34.waves.32
M3 - Conference contribution
AN - SCOPUS:84957655301
T3 - Proceedings of the Coastal Engineering Conference
BT - Proceedings of the 34th International Conference on Coastal Engineering, ICCE 2014
A2 - Lynett, Patrick
PB - American Society of Civil Engineers (ASCE)
T2 - 34th International Conference on Coastal Engineering, ICCE 2014
Y2 - 15 June 2014 through 20 June 2014
ER -