Figure 1
From: Observation of a giant nonlinear wave-packet on the surface of the ocean
Measurement in the Gulf of Biscay. (a) The time series of sea surface elevation showing the giant wave packet. (b) A comparison of the famous Draupner rogue wave (red line) and the giant wave packet measured in the Gulf of Biscay (blue line). Time in the horizontal axis has been shifted in order to display the crest of the largest waves at time \(t=0\). The distance L between the crests is obtained by means of the linear dispersion relation. Arrows indicate crest heights and trough depth. (c) East–North displacement of the buoy for the whole record (circles) and between the two troughs across the maximum elevation (edges circles). The marker colour is proportional to the surface elevation. (d) The frequency spectrum has been computed on the time series using standard FFT routine. Averages over samples of 1024 points (\(\Delta\)t = 0.78 s) with overlap of 50\(\%\) have been performed. The logarithmic scale spectrum shows a clear peak at 0.054 Hz which corresponds to a period of 18.5 s18.
