Flip-through event explained!

Research Press Release | October 14, 2015

  • An experimental back-light image showing transverse deformation of an ascending planar jet formed by wave impact on a vertical wall.
    An experimental back-light image showing transverse deformation of an ascending planar jet formed by wave impact on a vertical wall.
  • A photograph of ligaments, sheets and sea sprays observed at wave impact on concrete armor blocks.
    A photograph of ligaments, sheets and sea sprays observed at wave impact on concrete armor blocks.
Press Release
Overview When a steep breaking wave hits a vertical sea wall in shallow water, a rapidly ascending planar jet forms due to the wave impact on the wall and creates what is known as a ‘flip-through’ event. Previous studies focused on the impulsive pressures on the wall and on the velocity of the jet; however, in this study, we considered the formation and break-up of the jet itself. The mechanisms for the sequential surface deformations during the flip-through were identified through a stability analysis and a laboratory experiment, and help to explain the columnar structures often seen in photographs of violent wave impacts on harbour walls.
Inquiries

Yasunori WATANABE, Associate Professor, Coastal & Offshore EngineeringDivision of Field Engineering for the Environment, Graduate School of Engineering, Hokkaido University

E-mail: yasunori[at]eng.hokudai.ac.jp

Publications

Transverse instability of ascending planar jets formed by wave impacts on vertical walls. 
Y. Watanabe and D.M. Ingram

Proceedings of the Royal Society A (2015.10.14)

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