Abstract
[1] This article discusses the kinetics of internal waves, which propagate in a two-layer fluid system having a constant water depth, using particle image velocimetry (PIV). The experimental vector field of velocity and vertical distributions of its components were estimated at several phases in one wave cycle and compared with the corresponding predictions on the basis of third-order Stokes internal-wave theory. These attempts proved that the PIV technique enables the measurement of water velocity spatially induced by the nonlinear internal waves with considerable accuracy. This method was applied to trace water particle path. The measured trajectory was compared with the particle positions obtained theoretically by integrating the Eulerian velocity to a higher order in a Taylor series expansion.
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