Tidal Potential (sbctide.F90)

!----------------------------------------------------------------------- &nam_tide ! tide parameters (#ifdef key_tide) !----------------------------------------------------------------------- ln_tide_pot = .true. ! use tidal potential forcing ln_tide_ramp = .false. ! rdttideramp = 0. ! clname(1) = 'DUMMY' ! name of constituent - all tidal components must be set in namelist_cfg /

A module is available to compute the tidal potential and use it in the momentum equation. This option is activated when key_ tide is defined.

Some parameters are available in namelist nam_tide:

- ln_tide_pot activate the tidal potential forcing

- nb_harmo is the number of constituent used

- clname is the name of constituent

The tide is generated by the forces of gravity ot the Earth-Moon and Earth-Sun sytem;
they are expressed as the gradient of the astronomical potential (
).

The potential astronomical expressed, for the three types of tidal frequencies
following, by :

Tide long period :

(7.3) |

diurnal Tide :

(7.4) |

Semi-diurnal tide:

(7.5) |

is the amplitude of the wave k, the pulsation of the wave k, the astronomical phase of the wave to Greenwich.

We make corrections to the astronomical potential. We obtain :

(7.6) |

with a number of Love estimated to 0.6 which parameterised the astronomical tidal land, and a number of Love to 0.3 which parameterised the parameterisation due to the astronomical tidal land.

Gurvan Madec and the NEMO Team

NEMO European Consortium2017-02-17