The study of sea waves has always been in the focus of mankind's atten-
tion. This is attributed not only to a desire to understand the
behaviour in seas and oceans, but also, it has some practical necessity.
Developing up-to- date wind wave numerical methods requires detailed
mathematical modelling, starting with wave generation, development,
propagation and transformation on the surface in different water areas
under quasi-stationary conditions, up to a synthesis of climatic
features observed under different wave generation conditions in oceans,
sea or coastal areas. The present monograph considers wind waves in
terms of the most general formulation of the problem as a probable
hydrodynamic process with wide spatial variability. It ranges between
the global scale of the oceans, whose typical size is comparable with
the Earth's radius, to the regional and local scales of the seas,
including water areas limited in space with significant current or depth
gradients in coastal zones, where waves cease their existence having
propagated tens of thousand miles.