Lagrangian measurements of accelerations in the crests of breaking and broken waves

Soren Peter Kjeldsen, Pierre Bonmarin, Michael G. Skafel, William M. Drennan

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

Abstract

The present investigation reports synoptic measurements and analysis of particle accelerations and kinematics of plunging crests in deep water wave groups. The unexpected occurrence of unusully large waves has been documented on numerous occasions. While little is known about the statistics of these waves, even less is known of the dynamical conditions under which they occur. Nonlinear interactions among individual waves travelling within a group on an opposing current have been identified as an important mechanism in the formation of giant waves in deep waters in the ocean. In this study, the non-linear packet-focusing technique is used to generate steep, deep water plunging waves in two laboratory flumes. In one of these flumes the plunging breakers were generated on opposing currents. The kinematics of these waves are measured just up-wave of the onset of plunging, and these results are compared to those of a superposition model, a modified stretching model, and a model based on Stokes 3rd order theory combined with a linear wave spectrum for an irregular sea on an opposing current, developed for the present study. The present model represents the velocity beneath the plunging breakers significantly better than the two other models.

Original languageEnglish (US)
Pages (from-to)881-891
Number of pages11
JournalProceedings of the Coastal Engineering Conference
Volume1
StatePublished - Dec 1 1998
Externally publishedYes
EventProceedings of the 1998 26th International Conference on Coastal Engineering, ICCE-98 - Copenhagen, Denmark
Duration: Jun 22 1998Jun 26 1998

ASJC Scopus subject areas

  • Ocean Engineering

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