Subharmonic resonant excitation of edge waves by breaking surface waves

Nizar Abcha (1) , Tonglei Zhang , A.B Ezersky (1) , Efim Pelinovsky (2) , Ira Didenkulova

1 M2C - Morphodynamique Continentale et Côtière
2 IRPHE - Institut de Recherche sur les Phénomènes Hors Equilibre

Parametric excitation of edge waves with a frequency 2 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.

Domaines: Sciences de l'environnement

Nizar Abcha, Tonglei Zhang, A.B Ezersky, Efim Pelinovsky, Ira Didenkulova. Subharmonic resonant excitation of edge waves by breaking surface waves. Nonlinear Processes in Geophysics, 2017, 24 (2), pp.157 - 165. ⟨10.5194/npg-24-157-2017⟩. ⟨hal-01689530⟩