Extreme waves are studied in numerical simulations of the so-called Draupner seas that resemble the wave situation near the observation area of the Draupner wave, an iconic example of a freak, rogue wave. Recent new meteorological insights describe these seas as a substantial wind-generated wave system accompanied by two low-frequency lobes. With the significant wave height Hs= 12 m above a depth of 70 m and the wide directional spreading over 120∘ as design information, results are presented of simulations of phase resolved waves. Quantitative data are derived from 8000 waves over an area of 15 km2. Very high waves with crest heights exceeding 1.5 Hs occur in average in 20 min timespan over an area of 0.8 km2. Details will be given for an isolated freak wave and a sequence of 3 freak crest heights in a group of 2 high waves. In Part 2, van Groesen and Wijaya (J Ocean Eng Mar Energy, 2017), it will be shown that 60 s before their appearance freak waves can be predicted from radar images on board of a ship that scans the surrounding area over a distance of 2 km.
- Draupner seas
- Elevation exceedance
- Freak waves
- Multi-directional wave influx
- Radar observation