The evolution along the tank of unidirectional nonlinear wave groups with narrow spectrum is studied both experimentally and numerically. Measurements of the instantaneous surface elevation within the tank are carried out using digital processing of video-recorded sequences of images of the contact line movement at the tank side wall. The accuracy of the video-derived results is verified by measurements performed by conventional resistance-type wave gauges. An experimental procedure is developed that enables processing of large volumes of video images and capturing the spatial structure of the instantaneous wave field in the whole tank. The experimentally obtained data are compared quantitatively with the solutions of the modified nonlinear Schro¨dinger (MNLS, or Dysthe) equation written in either temporal or spatial form. Results on the evolution along the tank of wave frequency spectra and on the temporal evolution of the wave number spectra are presented. It is demonstrated that accounting for the 2nd order bound (locked) waves is essential for getting a qualitative and quantitative agreement between the measured and the computed spectra.
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ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
June 15–20, 2008
Estoril, Portugal
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4819-7
PROCEEDINGS PAPER
Spatial vs. Temporal Evolution of Nonlinear Wave Groups: Experiments and Modeling Based on the Dysthe Equation Available to Purchase
Lev Shemer,
Lev Shemer
Tel-Aviv University, Tel-Aviv, Israel
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Boris Dorfman
Boris Dorfman
Tel-Aviv University, Tel-Aviv, Israel
Search for other works by this author on:
Lev Shemer
Tel-Aviv University, Tel-Aviv, Israel
Boris Dorfman
Tel-Aviv University, Tel-Aviv, Israel
Paper No:
OMAE2008-57652, pp. 575-584; 10 pages
Published Online:
July 27, 2009
Citation
Shemer, L, & Dorfman, B. "Spatial vs. Temporal Evolution of Nonlinear Wave Groups: Experiments and Modeling Based on the Dysthe Equation." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 2: Structures, Safety and Reliability. Estoril, Portugal. June 15–20, 2008. pp. 575-584. ASME. https://doi.org/10.1115/OMAE2008-57652
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