Shurgalina E., Pelinovsky E.
Interference of unidirectional swell and wind waves in deep water in frameworks of linear potential theory is considered. Wind waves are described by Pierson–Moskowitz spectrum, and swell – by the frequency-modulated wave packet. It is noticed that in case of a variable wind in a storm area the swell waves can be focused on some distance from the origin area, forming abnormal big waves («freak waves»). A visibility of the freak wave swell of different shapes in wind wave field is examined.