Abstract
Statistical analysis of velocity structure functions are presented for turbulent flows at 1m above the bottom in a shallow (2m) bay in Denmark. High frequency (25 Hz) time series were collected mid day of 9 and 12, September 1997. The turbulent flow on day 12 was more energetic than on day 9 as a result of strong wind waves. The absolute scaling exponent ζp was shown to have scale-dependent behavior. In contrast, the relative scaling exponents ζp, calculated using the extended self similarity (ESS) method and calculating the third order structure function with the modulus, was found to have a scale-independent behavior and deviated from the Kolmogorov K41 law. Moreover, values of ζp on day 12 were more intermittent than on day 9. This result indicates the influence of the wind and waves on the scaling laws of the velocity structure functions.
Published Version
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