Waveform And Turbulence Generation
Associated With Large Amplitude Shoaling
Internal Waves In The South China Sea
Author(s)
R. P. Hornby & R. J. Small
Abstract
Turbulence and the displacement of pycnoclines caused by large amplitude
internal waves affect the transport of nutrients and pollutants in coastal seas and
the performance of underwater acoustic sensors. Understanding the propagation
characteristics of these waves and the mechanisms that result in turbulence
formation are therefore important. A Computational Fluid Dynamics (CFD)
model has been used to predict the propagation of large amplitude internal waves
in an area west of the Luzon Strait and results have been compared with
available data from the ONR sponsored Asian Seas International Acoustics
Experiment (ASIAEX). Both observations and model indicate a transformation
of wave shape from waves of depression to waves of elevation. There is
encouraging agreement on the evolved shape of the predicted wave, its phase
speed and the currents induced by the wave. Strong turbulence is predicted along
the seabed beneath the wave and in the elevated waves appearing behind the
leading wave. A more refined CFD grid produces some evidence of small scale
Kelvin-Helmholtz (K-H) instability in the leading wave but it would appear that
further grid refinement is required together with consideration of background
shear to more convincingly reproduce observational findings.
Keywords: internal waves, turbulence, Computational Fluid Dynamics.
1 Introduction
Large amplitude internal waves are a common feature of the World’s oceans [1].
They are frequently observed near regions of rapidly varying topography, and are
Keywords
internal waves, turbulence, Computational Fluid Dynamics.
Related Book
Other papers in this volume
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