AN EXPERIMENTAL STUDY ON MIXING INDUCED BY INTERNAL SOLITARY WAVE BREAKING
To understand the mixing that induced by internal solitary wave (ISW) breaking quantitatively,we conducted a 2-dimensional experiment on ISW in an internal wave tank in different amplitudes and slopes.Particle Image Velocimetry (PIV) was employed to visualize the velocity field of ISW during propagating,breaking,and reflecting.Vorticity,dissipation rate ε,and turbulence kinetic energy (TKE) were calculated.Results show in overall similar features among these parameters in different amplitudes a and slopes,showing two peaks in maximum square vorticity,TKE,and ε time series.The first peak appeared when nonlinearity boosting and the second at the breaking.We obtained ε ∝ a2 for ISW of relatively small amplitude,and for large amplitude ISW,ε increased slowly and stayed at a certain point.For incident wave of ISW of relatively small amplitude,a larger slope lead to weaker breaking and smaller ε,while for that of large amplitude there occurred a slope at which most intense breaking took place.The dissipation rate measured ranged 10-7-10-4m2/s3,which is a magnitude larger than turbulence dissipation rate measured in real oceanic ISW interface and internal tide breaking.
internal wave breakingPIVturbulent dissipationvorticityturbulence kinetic energy
NETL
NSTL
万方数据
维普
