Subharmonic resonant excitation of edge waves by breaking surface waves
Nizar Abcha1, Tonglei Zhang1, Alexander Ezersky1, Efim Pelinovsky2,3,4, and Ira Didenkulova2,51Morphodynamique Continentale et Côtière UMR6143, CNRS, Normandie Univ., UNICAEN, 14000 Caen, France 2Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minin Str., Nizhny Novgorod 603950, Russia 3Institute of Applied Physics, 46 Uljanov Str., Nizhny Novgorod 603950, Russia 4National Research University – Higher School of Economics, Nizhny Novgorod 603950, Russia 5Marine Systems Institute at Tallinn University of Technology, Akadeemia tee 15A, 12618 Tallinn, Estonia
Received: 24 Oct 2016 – Accepted for review: 28 Oct 2016 – Discussion started: 02 Nov 2016
Abstract. Parametric excitation of edge waves with a frequency two times less than the frequency of surface waves propagating perpendicular to the inclined bottom is investigated in laboratory experiments. The domain of instability on the plane of surface wave parameters (amplitude–frequency) is found. The subcritical instability is observed in the system of parametrically excited edge waves. It is shown that breaking of surface waves initiates turbulent effects and can suppress the parametric generation of edge waves.
Abcha, N., Zhang, T., Ezersky, A., Pelinovsky, E., and Didenkulova, I.: Subharmonic resonant excitation of edge waves by breaking surface waves, Nonlin. Processes Geophys. Discuss., doi:10.5194/npg-2016-63, in review, 2016.