- x vertical displacement of the pycnocline
- c phase speed
- f = 2Wsin (latitude) Coriolis parameter with W = 7.29 * 10-5 s-1
- coefficient of dispersion
- phi is the vertical structure of the pycnocline displacement
- quadratic coefficient of non linearity quadratique
- cubic coefficient of non linearity
- T(z) first correction to the non linear wave mode
- Q variations of the wave amplitude
- k quadratic dissipative coefficient.