where S(ω) is the total wave power at frequency ω and D(ω, θ ) is the distribution of this power over all possible directions. Notice here that the integral of D(ω, θ ) over all possible directions is normalized to unity. It is reasonable to assume here that the main direction of wave propagation is that of the generating wind (since we are talking for waves in coastal zones). But the experiment shows that this is not true. The wave power is distributed in all directions located near a dominating one. A parametric model for this distribution is given