Atmospheric Stability Parameters And
Sea Storm Severity
Author(s)
G. Benassai & L. Zuzolo
Abstract
The preliminary results of a statistical analysis of the atmospheric stability
effects on the growth of sea waves are given in this paper.
In unstable conditions (air colder than water) an increase of vertical mixing is
experienced due to turbulence which makes the wind profile more uniform with
height (deviating it from the logarithmic law). This circumstance increases the
wind stress on the sea surface and thus gives rise to higher wave energy.
In order to quantify the wave energy increase, the analysis of wave, wind and
temperature data was performed, on the basis of the SWAN (Sea WAve
monitoring Network) data set regarding both the Tyrrhenian and Adriatic Sea.
The statistical analysis was first performed in terms of relative deviation of
non-dimensional wave energy as a function of the Bulk Richardson Number in
terms of the wind velocity U10. Then another stability parameter, the Monin-Obukhov
length, was related to the friction velocity u*. This approach needed
the implementation of a numerical procedure to estimate the set of Monin-Obukhov
parameters, which account for atmospheric stability.
Keywords: wind and wave statistics, wave energy, atmospheric stability, energy
growth curves, Monin-Obukhov theory.
1 Introduction
Recent studies highlighted the influence of some apparently secondary effects on
the wave growth rate such as atmospheric stability.
In unstable conditions (air colder than water) an increase of vertical mixing in
the lower boundary layer is experienced as heat fluxes across sea surface
contribute to the increase of turbulence. This effect causes the wind profile to be
Keywords
wind and wave statistics, wave energy, atmospheric stability, energy
growth curves, Monin-Obukhov theory.
Related Book
Other papers in this volume
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