1 | MODULE dynspg_exp |
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2 | !!====================================================================== |
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3 | !! *** MODULE dynspg_exp *** |
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4 | !! Ocean dynamics: surface pressure gradient trend, explicit scheme |
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5 | !!====================================================================== |
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6 | !! History : 2.0 ! 2005-11 (V. Garnier, G. Madec, L. Bessieres) Original code |
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7 | !! 3.2 ! 2009-06 (G. Madec, M. Leclair, R. Benshila) introduce sshwzv module |
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8 | !!---------------------------------------------------------------------- |
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9 | |
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10 | !!---------------------------------------------------------------------- |
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11 | !! dyn_spg_exp : update the momentum trend with the surface |
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12 | !! pressure gradient in the free surface constant |
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13 | !! volume case with vector optimization |
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14 | !!---------------------------------------------------------------------- |
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15 | USE oce ! ocean dynamics and tracers |
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16 | USE dom_oce ! ocean space and time domain |
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17 | USE sbc_oce ! surface boundary condition: ocean |
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18 | USE phycst ! physical constants |
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19 | ! |
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20 | USE in_out_manager ! I/O manager |
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21 | USE lib_mpp ! distributed memory computing library |
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22 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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23 | USE prtctl ! Print control |
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24 | USE iom ! I/O library |
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25 | |
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26 | IMPLICIT NONE |
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27 | PRIVATE |
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28 | |
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29 | PUBLIC dyn_spg_exp ! called in dynspg.F90 |
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30 | |
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31 | !! * Substitutions |
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32 | # include "do_loop_substitute.h90" |
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33 | !!---------------------------------------------------------------------- |
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34 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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35 | !! $Id$ |
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36 | !! Software governed by the CeCILL license (see ./LICENSE) |
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37 | !!---------------------------------------------------------------------- |
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38 | CONTAINS |
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39 | |
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40 | SUBROUTINE dyn_spg_exp( kt, Kmm, puu, pvv, Krhs ) |
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41 | !!---------------------------------------------------------------------- |
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42 | !! *** routine dyn_spg_exp *** |
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43 | !! |
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44 | !! ** Purpose : Compute the now trend due to the surface pressure |
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45 | !! gradient in case of explicit free surface formulation and |
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46 | !! add it to the general trend of momentum equation. |
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47 | !! |
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48 | !! ** Method : Explicit free surface formulation. Add to the general |
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49 | !! momentum trend the surface pressure gradient : |
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50 | !! (uu(rhs),vv(rhs)) = (uu(rhs),vv(rhs)) + (spgu,spgv) |
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51 | !! where spgu = -1/rau0 d/dx(ps) = -g/e1u di( ssh(now) ) |
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52 | !! spgv = -1/rau0 d/dy(ps) = -g/e2v dj( ssh(now) ) |
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53 | !! |
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54 | !! ** Action : (puu(:,:,:,Krhs),pvv(:,:,:,Krhs)) trend of horizontal velocity increased by |
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55 | !! the surf. pressure gradient trend |
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56 | !!--------------------------------------------------------------------- |
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57 | INTEGER , INTENT( in ) :: kt ! ocean time-step index |
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58 | INTEGER , INTENT( in ) :: Kmm, Krhs ! ocean time level indices |
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59 | REAL(wp), DIMENSION(jpi,jpj,jpk,jpt), INTENT(inout) :: puu, pvv ! ocean velocities and RHS of momentum equation |
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60 | !! |
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61 | INTEGER :: ji, jj, jk ! dummy loop indices |
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62 | !!---------------------------------------------------------------------- |
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63 | ! |
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64 | IF( kt == nit000 ) THEN |
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65 | IF(lwp) WRITE(numout,*) |
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66 | IF(lwp) WRITE(numout,*) 'dyn_spg_exp : surface pressure gradient trend' |
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67 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~ (explicit free surface)' |
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68 | ! |
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69 | spgu(:,:) = 0._wp ; spgv(:,:) = 0._wp |
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70 | ! |
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71 | IF( .NOT.ln_linssh .AND. lwp ) WRITE(numout,*) ' non linear free surface: spg is included in dynhpg' |
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72 | ENDIF |
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73 | |
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74 | IF( ln_linssh ) THEN !* linear free surface : add the surface pressure gradient trend |
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75 | ! |
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76 | DO_2D_00_00 |
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77 | spgu(ji,jj) = - grav * ( ssh(ji+1,jj,Kmm) - ssh(ji,jj,Kmm) ) * r1_e1u(ji,jj) |
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78 | spgv(ji,jj) = - grav * ( ssh(ji,jj+1,Kmm) - ssh(ji,jj,Kmm) ) * r1_e2v(ji,jj) |
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79 | END_2D |
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80 | ! |
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81 | DO_3D_00_00( 1, jpkm1 ) |
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82 | puu(ji,jj,jk,Krhs) = puu(ji,jj,jk,Krhs) + spgu(ji,jj) |
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83 | pvv(ji,jj,jk,Krhs) = pvv(ji,jj,jk,Krhs) + spgv(ji,jj) |
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84 | END_3D |
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85 | ! |
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86 | ENDIF |
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87 | ! |
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88 | END SUBROUTINE dyn_spg_exp |
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89 | |
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90 | !!====================================================================== |
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91 | END MODULE dynspg_exp |
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