source: palm/trunk/SOURCE/ls_forcing.f90 @ 1244

 MODULE ls_forcing_mod

!--------------------------------------------------------------------------------!
! This file is part of PALM.
!
! PALM is free software: you can redistribute it and/or modify it under the terms
! of the GNU General Public License as published by the Free Software Foundation,
! either version 3 of the License, or (at your option) any later version.
!
! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
!
! You should have received a copy of the GNU General Public License along with
! PALM. If not, see <http://www.gnu.org/licenses/>.
!
! Copyright 1997-2012  Leibniz University Hannover
!--------------------------------------------------------------------------------!
!
! Current revisions:
! ------------------
!
!
! Former revisions:
! -----------------
! $Id: ls_forcing.f90 1242 2013-10-30 11:50:11Z raasch $
!
! 1241 2013-10-30 11:36:58Z heinze
! Initial revision
!
! Description:
! ------------
! Calculates large scale forcings (geostrophic wind and subsidence velocity) as 
! well as surfaces fluxes dependend on time given in an external file (LSF_DATA).
! Code is based in parts on DALES and UCLA-LES.
!--------------------------------------------------------------------------------!

    PRIVATE
    PUBLIC init_ls_forcing, ls_forcing_surf, ls_forcing_vert 
    SAVE


 CONTAINS

    SUBROUTINE init_ls_forcing

       USE arrays_3d
       USE control_parameters
       USE cpulog
       USE indices
       USE interfaces
       USE pegrid
       USE user

       IMPLICIT NONE

       INTEGER :: finput = 90, ierrn, k, t 
       CHARACTER (100):: chmess
       CHARACTER(1) :: hash
       REAL :: r_dummy, fac
       REAL :: highheight, highug_vert, highvg_vert, highwsubs_vert
       REAL :: lowheight, lowug_vert, lowvg_vert, lowwsubs_vert

       ALLOCATE( p_surf(0:nlsf), pt_surf(0:nlsf), q_surf(0:nlsf),         &
                 qsws_surf(0:nlsf), shf_surf(0:nlsf), time_vert(0:nlsf),  &
                 time_surf(0:nlsf), ug_vert(nzb:nzt+1,0:nlsf),            &
                 vg_vert(nzb:nzt+1,0:nlsf), wsubs_vert(nzb:nzt+1,0:nlsf) )

       p_surf = 0.0; pt_surf = 0.0; q_surf = 0.0; qsws_surf = 0.0
       shf_surf = 0.0; time_vert = 0.0; time_surf = 0.0; ug_vert = 0.0
       vg_vert = 0.0; wsubs_vert = 0.0


       OPEN (finput, FILE='LSF_DATA', STATUS='OLD', &
              FORM='FORMATTED', IOSTAT=ierrn)

       IF (ierrn /= 0 ) THEN
          message_string = 'file LSF_DATA does not exist'
          CALL message( 'ls_forcing', 'PA0368', 1, 2, 0, 6, 0 )
       ENDIF

       ierrn = 0
!
!--    First three lines of LSF_DATA contain header
       READ( finput, FMT='(a100)', IOSTAT=ierrn ) chmess
       READ( finput, FMT='(a100)', IOSTAT=ierrn ) chmess
       READ( finput, FMT='(a100)', IOSTAT=ierrn ) chmess

       IF (ierrn /= 0 ) THEN
          message_string = 'errors in file LSF_DATA'
          CALL message( 'ls_forcing', 'PA0369', 1, 2, 0, 6, 0 )
       ENDIF

!
!--    Surface values are read in
       t     = 0
       ierrn = 0

       DO WHILE ( time_surf(t) < end_time )
          t = t + 1
          READ( finput, *, IOSTAT = ierrn ) time_surf(t), shf_surf(t), &
                                             qsws_surf(t), pt_surf(t),  &
                                             q_surf(t), p_surf(t)

          IF ( ierrn < 0 ) THEN
            WRITE( message_string, * ) 'No time dependend surface variables ',&
                              'in&LSF_DATA for end of run found'

             CALL message( 'ls_forcing', 'PA0370', 1, 2, 0, 6, 0 )
          ENDIF
       ENDDO


       IF ( time_surf(1) > end_time ) THEN
          WRITE( message_string, * ) 'No time dependend surface variables in ',  &
                                     '&LSF_DATA for end of run found - ',  &
                                     'lsf_surf is set to FALSE'
          CALL message( 'ls_forcing', 'PA0371', 0, 0, 0, 6, 0 )
          lsf_surf = .FALSE.
       ENDIF

!
!--    Go to the end of the list with surface variables
       DO WHILE ( ierrn == 0 )
          READ (finput, *, IOSTAT = ierrn) r_dummy
       ENDDO

!
!--    Profiles of ug, vg and w_subs are read in (large scale forcing)

       t = 0
       DO WHILE (time_vert(t) < end_time)
          t = t + 1
          hash = "#"
          ierrn = 1 ! not zero
!
!--       Search for the next line consisting of "# time", 
!--       from there onwards the profiles will be read
          DO WHILE ( .NOT. ( hash == "#" .AND. ierrn == 0 ) ) 
             READ( finput, *, IOSTAT=ierrn ) hash, time_vert(t)
             IF ( ierrn < 0 ) THEN 
                WRITE( message_string, * ) 'No time dependend vertical profiles',&
                                 ' in&LSF_DATA for end of run found'
                CALL message( 'ls_forcing', 'PA0372', 1, 2, 0, 6, 0 )
             ENDIF
          ENDDO

          IF ( t == 1 .AND. time_vert(t) > end_time ) EXIT

          READ( finput, *, IOSTAT=ierrn ) lowheight, lowug_vert, lowvg_vert, &
                                          lowwsubs_vert
          IF (ierrn /= 0 ) THEN
             message_string = 'errors in file LSF_DATA'
             CALL message( 'nudging', 'PA0369', 1, 2, 0, 6, 0 )
          ENDIF

          READ( finput, *, IOSTAT=ierrn ) highheight, highug_vert, highvg_vert, &
                                          highwsubs_vert
      
          IF (ierrn /= 0 ) THEN
             message_string = 'errors in file LSF_DATA'
             CALL message( 'nudging', 'PA0369', 1, 2, 0, 6, 0 )
          ENDIF


          DO  k = nzb, nzt+1
             IF ( highheight < zu(k) ) THEN
                lowheight     = highheight
                lowug_vert    = highug_vert
                lowvg_vert    = highvg_vert
                lowwsubs_vert = highwsubs_vert

                ierrn = 0
                READ( finput, *, IOSTAT=ierrn ) highheight, highug_vert, &
                                                highvg_vert, highwsubs_vert

                IF (ierrn /= 0 ) THEN
                   message_string = 'errors in file LSF_DATA'
                   CALL message( 'nudging', 'PA0369', 1, 2, 0, 6, 0 )
                ENDIF

             ENDIF

!
!--          Interpolation of prescribed profiles in space 
             fac = (highheight-zu(k))/(highheight - lowheight)

             ug_vert(k,t)    = fac*lowug_vert    + (1-fac)*highug_vert
             vg_vert(k,t)    = fac*lowvg_vert    + (1-fac)*highvg_vert
             wsubs_vert(k,t) = fac*lowwsubs_vert + (1-fac)*highwsubs_vert

          ENDDO

       ENDDO 

       IF ( time_vert(1) > end_time ) THEN
          WRITE( message_string, * ) 'Time dependent large scale profile ',&
                            'forcing from&LSF_DATA sets in after end of ' ,&
                            'simulation - lsf_vert is set to FALSE'
          CALL message( 'ls_forcing', 'PA0373', 0, 0, 0, 6, 0 )
          lsf_vert = .FALSE.
       ENDIF

       CLOSE( finput )


    END SUBROUTINE init_ls_forcing 


    SUBROUTINE ls_forcing_surf ( time )

       USE arrays_3d
       USE control_parameters
       USE cpulog
       USE indices
       USE interfaces
       USE pegrid
       USE user

       IMPLICIT NONE

       REAL, INTENT(in)  :: time
       REAL :: fac
       INTEGER :: t

!
!--    Interpolation in time of LSF_DATA at the surface
       t = 1
       DO WHILE ( time > time_surf(t) )
          t = t + 1
       ENDDO
       IF ( time /= time_surf(t) ) THEN
         t = t - 1
       ENDIF

       fac = ( time -time_surf(t) ) / ( time_surf(t+1) - time_surf(t) )

       shf              = shf_surf(t) + fac * ( shf_surf(t+1) - shf_surf(t) )
       qsws             = qsws_surf(t) + fac * ( qsws_surf(t+1) - qsws_surf(t) )
       pt_surface       = pt_surf(t) + fac * ( pt_surf(t+1) - pt_surf(t) )
       surface_pressure = p_surf(t) + fac * ( p_surf(t+1) - p_surf(t) )

    END SUBROUTINE ls_forcing_surf 


    SUBROUTINE ls_forcing_vert ( time )

       USE arrays_3d
       USE control_parameters
       USE cpulog
       USE indices
       USE interfaces
       USE pegrid
       USE user

       IMPLICIT NONE

       REAL, INTENT(in)  :: time
       REAL :: fac
       INTEGER :: t

!
!--    Interpolation in time of LSF_DATA for ug, vg and w_subs
       t = 1
       DO WHILE ( time > time_vert(t) )
          t = t + 1
       ENDDO
       IF ( time /= time_vert(t) ) THEN
         t = t - 1
       ENDIF

       fac = (time-time_vert(t)) / (time_vert(t+1)-time_vert(t))

       ug     = ug_vert(:,t) + fac * ( ug_vert(:,t+1) - ug_vert(:,t) )
       vg     = vg_vert(:,t) + fac * ( vg_vert(:,t+1) - vg_vert(:,t) )

       IF ( large_scale_subsidence ) THEN
          w_subs = wsubs_vert(:,t) + fac * ( wsubs_vert(:,t+1) - wsubs_vert(:,t) )
       ENDIF

    END SUBROUTINE ls_forcing_vert


 END MODULE ls_forcing_mod