## Tide Potential

MOHID Water forum. Questions and discussion around MOHID Water
mfernand@fing.edu.uy
MOHID User
Posts: 30
Joined: Thu Jan 01, 1970 00:00
Location: Montevideo, Uruguay

### Tide Potential

Hi,
I would like to know which are the terms added to the balance equations when Tide Potential is set to 1 in the Hydrodynamic.dat file cause nothing is said in the Hydrodynamic or MOHID manual about it.
Best regards,
Mariana

mfernand@fing.edu.uy
MOHID User
Posts: 30
Joined: Thu Jan 01, 1970 00:00
Location: Montevideo, Uruguay
First is compute kind of virtual water level field that we call TidePotentialLevel matrix

See subroutine ModifyTidePotential in the ModuleHydrodynamic.f90. I have program two method (Kantha and Clayson, 2000 book and Lefévre, 2001 – PhD thesis)

The gradients of this field multiply by the gravity give the acceleration associated with the astronomic forces effect.

!Aceleration due the tide potential
![m/s^2] = [m/s^2] * [m] / [m]
TidePotentialAceleration = - Gravity * (TidePotentialLevel(iSouth, jWest) - &
TidePotentialLevel(I, J)) / &
DZX_ZY(iSouth, jWest)

TidePotentialAceleration X = - g * d (TidePotentialLevel) / dX

TidePotentialAceleration Y = - g * d (TidePotentialLevel) / dY

TidePotentialAceleration (X,Y) is an aceleration add explicity to the momenutm balance equations.

Bets regards,
Paulo