!-----------------------------------------------------------------------
&namdyn_spg    !   surface pressure gradient                            (default: NO selection)
!-----------------------------------------------------------------------
   ln_dynspg_exp  = .false.   ! explicit free surface
   ln_dynspg_ts   = .false.   ! split-explicit free surface
      ln_bt_fw      = .true.     ! Forward integration of barotropic Eqs.
      nn_bt_flt     = 1          ! Add dissipation with either boxcar averaging or dissipative Forward-Backward
      !                          !                     = 0 None
      !                          !                     = 1 Boxcar over   nn_e sub-steps
      !                          !                     = 2 Boxcar over 2*nn_e  "    "
      !                          !                     = 3 Temporal dissipation (Demange 2019)
      rn_bt_alpha   =  0.           ! (if nn_bt_flt=3) ==> Temporal diffusion parameter (recommended values = 0.07-0.09)
      !
      ln_bt_auto    = .true.     ! Number of sub-step defined from:
         rn_bt_cmax   =  0.8        ! =T : the Maximum Courant Number allowed
         nn_e         =  30         ! =F : the number of sub-step in rn_Dt seconds
/