rp_main2d.F

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#include "cppdefs.h"
#if defined TL_IOMS && !defined SOLVE3D
      SUBROUTINE rp_main2d (RunInterval)
!
!git $Id$
!================================================== Hernan G. Arango ===
!  Copyright (c) 2002-2025 The ROMS Group            Andrew M. Moore   !
!    Licensed under a MIT/X style license                              !
!    See License_ROMS.md                                               !
!=======================================================================
!                                                                      !
!  This routine is the main driver for representers tangent linear     !
!  ROMS  when  configure as shallow water (barotropic ) ocean          !
!  model only.  It advances advances forward the representer model     !
!  for all nested grids,  if any,  by the specified time  interval     !
!  (seconds), RunInterval.                                             !
!                                                                      !
!=======================================================================
!
      USE mod_param
      USE mod_parallel
# if defined MODEL_COUPLING && defined MCT_LIB
      USE mod_coupler
# endif
      USE mod_iounits
      USE mod_scalars
      USE mod_stepping
!
      USE dateclock_mod,           ONLY : time_string
# ifdef TIDE_GENERATING_FORCES
      USE equilibrium_tide_mod,    ONLY : equilibrium_tide
# endif
# if defined ATM_COUPLING_NOT_YET && defined MCT_LIB
      USE mct_coupler_mod,         ONLY : ocn2atm_coupling
# endif
# if defined WAV_COUPLING_NOT_YET && defined MCT_LIB
      USE mct_coupler_mod,         ONLY : ocn2wav_coupling
# endif
      USE strings_mod,             ONLY : founderror
      USE rp_diag_mod,             ONLY : rp_diag
# ifdef defined ADJUST_WSTRESS
      USE rp_frc_adjust_mod,       ONLY : rp_frc_adjust
# endif
      USE rp_ini_fields_mod,       ONLY : rp_ini_fields, rp_ini_zeta
# ifdef ADJUST_BOUNDARY
      USE rp_obc_adjust_mod,       ONLY : rp_obc_adjust
# endif
# ifdef NEARSHORE_MELLOR_NOT_YET
!!    USE rp_radiation_stress_mod, ONLY : rp_radiation_stress
# endif
# if defined SSH_TIDES_NOT_YET || defined UV_TIDES_NOT_YET
!!    USE rp_set_tides_mod,        ONLY : rp_set_tides
# endif
      USE rp_set_vbc_mod,          ONLY : rp_set_vbc
      USE rp_step2d_mod,           ONLY : rp_step2d
# ifdef FLOATS_NOT_YET
!!    USE rp_step_floats_mod,      ONLY : rp_step_floats
# endif
# ifdef WEAK_CONSTRAINT
      USE tl_forcing_mod,          ONLY : tl_forcing
# endif
# ifdef RP_AVERAGES
      USE rp_set_avg_mod,          ONLY : tl_set_avg
# endif
# if defined PROPAGATOR || \
    (defined masking    && (defined read_water || defined write_water))
      USE wpoints_mod,             ONLY : wpoints
# endif
!
      implicit none
!
!  Imported variable declarations.
!
      real(dp), intent(in) :: RunInterval
!
!  Local variable declarations.
!
      integer :: ng, tile
      integer :: next_indx1
# ifdef FLOATS_NOT_YET
      integer :: Lend, Lstr, chunk_size
# endif
!
      real(r8) :: MaxDT, my_StepTime
!
      character (len=*), parameter :: MyFile =                          &
     &  __FILE__
!
!=======================================================================
!  Time-step tangent linear vertically integrated equations.
!=======================================================================
!
      my_steptime=0.0_r8
      maxdt=maxval(dt)
 
      step_loop : DO WHILE (my_steptime.le.(runinterval+0.5_r8*maxdt))
 
        my_steptime=my_steptime+maxdt
!
!  Set time clock.
!
        DO ng=1,ngrids
          iic(ng)=iic(ng)+1
!$OMP MASTER
          time(ng)=time(ng)+dt(ng)
          tdays(ng)=time(ng)*sec2day
          CALL time_string (time(ng), time_code(ng))
!$OMP END MASTER
        END DO
!$OMP BARRIER
!
!-----------------------------------------------------------------------
!  Read in required data, if any, from input NetCDF files.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
!$OMP MASTER
          CALL rp_get_data (ng)
!$OMP END MASTER
!$OMP BARRIER
          IF (founderror(exit_flag, noerror, __line__, myfile)) RETURN
        END DO
!
!-----------------------------------------------------------------------
!  If applicable, process input data: time interpolate between data
!  snapshots.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
          DO tile=first_tile(ng),last_tile(ng),+1
            CALL rp_set_data (ng, tile)
          END DO
!$OMP BARRIER
        END DO
        IF (founderror(exit_flag, noerror, __line__, myfile)) RETURN
 
# ifdef WEAK_CONSTRAINT
!
!-----------------------------------------------------------------------
!  If appropriate, add convolved adjoint solution impulse forcing to
!  the representer model solution. Notice that the forcing is only
!  needed after finishing all inner loops. The forcing is continuous.
!  That is, it is time interpolated at every time-step from available
!  snapshots (FrequentImpulse=TRUE).
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
          IF (frequentimpulse(ng)) THEN
            DO tile=first_tile(ng),last_tile(ng),+1
              CALL tl_forcing (ng, tile, kstp(ng), nstp(ng))
            END DO
!$OMP BARRIER
          END IF
        END DO
# endif
!
!-----------------------------------------------------------------------
!  If not a restart, initialize all time levels and compute other
!  initial fields.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
          IF (iic(ng).eq.ntstart(ng)) THEN
!
!  Initialize free-surface.
!
            DO tile=first_tile(ng),last_tile(ng),+1
              CALL rp_ini_zeta (ng, tile, irpm)
            END DO
!$OMP BARRIER
!
!  Initialize other state variables.
!
            DO tile=last_tile(ng),first_tile(ng),-1
              CALL rp_ini_fields (ng, tile, irpm)
            END DO
!$OMP BARRIER
          END IF
        END DO
!
!-----------------------------------------------------------------------
!  Compute and report diagnostics. If appropriate, accumulate time-
!  averaged output data which needs a irreversible loop in shared-memory
!  jobs.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
          DO tile=first_tile(ng),last_tile(ng),+1         ! irreversible
# ifdef RP_AVERAGES
            CALL tl_set_avg (ng, tile)
# endif
# ifdef DIAGNOSTICS
!!          CALL rp_set_diags (ng, tile)
# endif
# ifdef TIDE_GENERATING_FORCES
            CALL equilibrium_tide (ng, tile, irpm)
# endif
            CALL rp_diag (ng, tile)
          END DO
!$OMP BARRIER
        END DO
 
# if defined ATM_COUPLING_NOT_YET && defined MCT_LIB
!
!-----------------------------------------------------------------------
!  Couple to atmospheric model every CoupleSteps(Iatmos) timesteps: get
!  air/sea fluxes.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
          IF ((iic(ng).ne.ntstart(ng)).and.                             &
     &        mod(iic(ng)-1,couplesteps(iatmos,ng)).eq.0) THEN
            DO tile=last_tile(ng),first_tile(ng),-1
              CALL ocn2atm_coupling (ng, tile)
            END DO
!$OMP BARRIER
          END IF
        END DO
# endif
 
# if defined WAV_COUPLING_NOT_YET && defined MCT_LIB
!
!-----------------------------------------------------------------------
!  Couple to waves model every CoupleSteps(Iwaves) timesteps: get
!  waves/sea fluxes.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
          IF ((iic(ng).ne.ntstart(ng)).and.                             &
     &        mod(iic(ng)-1,couplesteps(iwaves,ng)).eq.0) THEN
            DO tile=first_tile(ng),last_tile(ng),+1
              CALL ocn2wav_coupling (ng, tile)
            END DO
!$OMP BARRIER
          END IF
        END DO
# endif
 
# ifdef NEARSHORE_MELLOR_NOT_YET
!
!-----------------------------------------------------------------------
!  Compute radiation stress terms.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
          DO tile=last_tile(ng),first_tile(ng),-1
            CALL rp_radiation_stress (ng, tile)
          END DO
!$OMP BARRIER
        END DO
# endif
!
!-----------------------------------------------------------------------
!  Set vertical boundary conditions. Process tidal forcing.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
          DO tile=first_tile(ng),last_tile(ng),+1
            CALL rp_set_vbc (ng, tile)
# if defined SSH_TIDES_NOT_YET || defined UV_TIDES_NOT_YET
            CALL rp_set_tides (ng, tile)
# endif
          END DO
!$OMP BARRIER
        END DO
 
# ifdef ADJUST_BOUNDARY
!
!-----------------------------------------------------------------------
!  Interpolate open boundary increments and adjust open boundaries.
!  Skip the last output timestep.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
          IF (iic(ng).lt.(ntend(ng)+1)) THEN
            DO tile=first_tile(ng),last_tile(ng),+1
              CALL rp_obc_adjust (ng, tile, lbinp(ng))
            END DO
!$OMP BARRIER
          END IF
        END DO
# endif
 
# ifdef ADJUST_WSTRESS
!
!-----------------------------------------------------------------------
!  Interpolate surface forcing increments and adjust surface forcing.
!  Skip the last output timestep.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
          IF (iic(ng).lt.(ntend(ng)+1)) THEN
            DO tile=first_tile(ng),last_tile(ng),+1
              CALL rp_frc_adjust (ng, tile, lfinp(ng))
            END DO
!$OMP BARRIER
          END IF
        END DO
# endif
!
!-----------------------------------------------------------------------
!  If appropriate, write out fields into output NetCDF files.  Notice
!  that IO data is written in delayed and serial mode.  Exit if last
!  time step.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
!$OMP MASTER
          CALL rp_output (ng)
!$OMP END MASTER
!$OMP BARRIER
          IF ((founderror(exit_flag, noerror, __line__, myfile)).or.    &
     &        ((iic(ng).eq.(ntend(ng)+1)).and.(ng.eq.ngrids))) RETURN
        END DO
!
!-----------------------------------------------------------------------
!  Solve the vertically integrated primitive equations for the
!  free-surface and momentum components.
!-----------------------------------------------------------------------
!
!  Set time indices for predictor step. The PREDICTOR_2D_STEP switch
!  it is assumed to be false before the first time-step.
!
        DO ng=1,ngrids
          iif(ng)=1
          nfast(ng)=1
          next_indx1=3-indx1(ng)
          IF (.not.predictor_2d_step(ng)) THEN
            predictor_2d_step(ng)=.true.
            IF (first_2d_step) THEN
              kstp(ng)=indx1(ng)
            ELSE
              kstp(ng)=3-indx1(ng)
            END IF
            knew(ng)=3
            krhs(ng)=indx1(ng)
          END IF
!
!  Predictor step - Advance barotropic equations using 2D time-step
!  ==============   predictor scheme.
!
          DO tile=last_tile(ng),first_tile(ng),-1
            CALL rp_step2d (ng, tile)
          END DO
!$OMP BARRIER
        END DO
!
!  Set time indices for corrector step.
!
        DO ng=1,ngrids
          IF (predictor_2d_step(ng)) THEN
            predictor_2d_step(ng)=.false.
            knew(ng)=next_indx1
            kstp(ng)=3-knew(ng)
            krhs(ng)=3
            IF (iif(ng).lt.(nfast(ng)+1)) indx1(ng)=next_indx1
          END IF
!
!  Corrector step - Apply 2D time-step corrector scheme.  Notice that
!  ==============   there is not need for a corrector step during the
!  auxiliary (nfast+1) time-step.
!
          IF (iif(ng).lt.(nfast(ng)+1)) THEN
            DO tile=first_tile(ng),last_tile(ng),+1
              CALL rp_step2d (ng, tile)
            END DO
!$OMP BARRIER
          END IF
        END DO
 
# ifdef FLOATS_NOT_YET
!
!-----------------------------------------------------------------------
!  Compute Lagrangian drifters trajectories: Split all the drifters
!  between all the computational threads, except in distributed-memory
!  and serial configurations. In distributed-memory, the parallel node
!  containing the drifter is selected internally since the state
!  variables do not have a global scope.
!-----------------------------------------------------------------------
!
        DO ng=1,ngrids
          IF (lfloats(ng)) THEN
#  ifdef _OPENMP
            chunk_size=(nfloats(ng)+numthreads-1)/numthreads
            lstr=1+mythread*chunk_size
            lend=min(nfloats(ng),lstr+chunk_size-1)
#  else
            lstr=1
            lend=nfloats(ng)
#  endif
            CALL rp_step_floats (ng, lstr, lend)
!$OMP BARRIER
!
!  Shift floats time indices.
!
            nfp1(ng)=mod(nfp1(ng)+1,nft+1)
            nf(ng)=mod(nf(ng)+1,nft+1)
            nfm1(ng)=mod(nfm1(ng)+1,nft+1)
            nfm2(ng)=mod(nfm2(ng)+1,nft+1)
            nfm3(ng)=mod(nfm3(ng)+1,nft+1)
          END IF
        END DO
# endif
      END DO step_loop
 
      RETURN
      END SUBROUTINE rp_main2d
#else
      SUBROUTINE rp_main2d
      RETURN
      END SUBROUTINE rp_main2d
#endif