Directional wave spectra derived from a data set measured off the west coast of New Zealand are used to investigate the directional spreading within swell. The location where the measurements were made is particularly useful for the study as a more or less constant swell component originating from the Southern Ocean is observed in the sea states. The spectra are partitioned into wind-sea and swell components, and estimates of the directional spreading of the swell component is made. A function for the directional distribution of the swell is proposed.
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