Ursell Number Formula

Equation for calculate ursell number is,

$U = \frac{H \cdot λ^{2}}{h^{3}}$

where,

H is the wave height (the difference between the elevations of the wave crest and trough).
λ is the wavelength, which has to be large compared to the depth, λ ≫ h.
h is the mean water depth.
U is the Ursell Number

H is the wave height (the difference between the elevations of the wave crest and trough).

λ is the wavelength, which has to be large compared to the depth, λ ≫ h.

h is the mean water depth.

U is the Ursell Number