[4738] | 1 | MODULE coastdist |
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| 2 | |
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| 3 | USE utils |
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| 4 | USE netcdf |
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| 5 | |
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| 6 | IMPLICIT NONE |
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| 7 | PUBLIC |
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| 8 | |
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| 9 | CONTAINS |
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| 10 | |
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| 11 | SUBROUTINE coast_dist_weight( presto ) |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | !! *** ROUTINE coast_dist_weight *** |
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| 14 | !! |
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| 15 | !! ** Purpose: Weight restoration coefficient by distance to coast |
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| 16 | !! |
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| 17 | !! ** Method: 1) Calculate distance to coast |
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| 18 | !! 2) Reduce resto with 1000km of coast |
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| 19 | !! |
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| 20 | IMPLICIT NONE |
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[4739] | 21 | REAL(wp), DIMENSION(jpi,jpj), INTENT( inout ) :: presto |
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| 22 | REAL(wp), DIMENSION(jpi,jpj) :: zdct |
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| 23 | REAL(wp) :: zinfl = 1000.e3_wp ! Distance of influence of coast line (could be |
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[4738] | 24 | ! a namelist setting) |
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| 25 | INTEGER :: jj, ji ! dummy loop indices |
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| 26 | |
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| 27 | |
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| 28 | CALL cofdis( zdct ) |
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| 29 | DO jj = 1, jpj |
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| 30 | DO ji = 1, jpi |
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| 31 | zdct(ji,jj) = MIN( zinfl, zdct(ji,jj) ) |
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[4739] | 32 | presto(ji,jj) = presto(ji, jj) * 0.5_wp * ( 1._wp - COS( rpi*zdct(ji,jj)/zinfl) ) |
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[4738] | 33 | END DO |
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| 34 | END DO |
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| 35 | |
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| 36 | END SUBROUTINE coast_dist_weight |
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| 37 | |
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| 38 | |
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| 39 | SUBROUTINE cofdis( pdct ) |
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| 40 | !!---------------------------------------------------------------------- |
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| 41 | !! *** ROUTINE cofdis *** |
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| 42 | !! |
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| 43 | !! ** Purpose : Compute the distance between ocean T-points and the |
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| 44 | !! ocean model coastlines. |
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| 45 | !! |
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| 46 | !! ** Method : For each model level, the distance-to-coast is |
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| 47 | !! computed as follows : |
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| 48 | !! - The coastline is defined as the serie of U-,V-,F-points |
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| 49 | !! that are at the ocean-land bound. |
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| 50 | !! - For each ocean T-point, the distance-to-coast is then |
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| 51 | !! computed as the smallest distance (on the sphere) between the |
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| 52 | !! T-point and all the coastline points. |
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| 53 | !! - For land T-points, the distance-to-coast is set to zero. |
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| 54 | !! |
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| 55 | !! ** Action : - pdct, distance to the coastline (argument) |
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| 56 | !! - NetCDF file 'dist.coast.nc' |
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| 57 | !!---------------------------------------------------------------------- |
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| 58 | !! |
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[4739] | 59 | REAL(wp), DIMENSION(jpi,jpj), INTENT( out ) :: pdct ! distance to the coastline |
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[4738] | 60 | !! |
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| 61 | INTEGER :: ji, jj, jl ! dummy loop indices |
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| 62 | INTEGER :: iju, ijt, icoast, itime, ierr, icot ! local integers |
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| 63 | CHARACTER (len=32) :: clname ! local name |
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[4739] | 64 | REAL(wp) :: zdate0 ! local scalar |
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| 65 | REAL(wp), POINTER, DIMENSION(:,:) :: zxt, zyt, zzt, zmask |
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| 66 | REAL(wp), POINTER, DIMENSION(: ) :: zxc, zyc, zzc, zdis ! temporary workspace |
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[4738] | 67 | LOGICAL , ALLOCATABLE, DIMENSION(:,:) :: llcotu, llcotv, llcotf ! 2D logical workspace |
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| 68 | |
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| 69 | !!---------------------------------------------------------------------- |
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| 70 | ! |
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| 71 | ALLOCATE( zxt(jpi,jpj) , zyt(jpi,jpj) , zzt(jpi,jpj) , zmask(jpi,jpj) ) |
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| 72 | ALLOCATE(zxc(3*jpi*jpj), zyc(3*jpi*jpj), zzc(3*jpi*jpj), zdis(3*jpi*jpj) ) |
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| 73 | ALLOCATE( llcotu(jpi,jpj), llcotv(jpi,jpj), llcotf(jpi,jpj) ) |
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| 74 | ALLOCATE( gphiu(jpi,jpj), gphiv(jpi,jpj), gphif(jpi,jpj) ) |
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| 75 | ALLOCATE( glamu(jpi,jpj), glamv(jpi,jpj), glamf(jpi,jpj), glamt(jpi,jpj) ) |
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| 76 | ALLOCATE( umask(jpi,jpj), vmask(jpi,jpj), fmask(jpi,jpj) ) |
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| 77 | ! |
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| 78 | |
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| 79 | CALL check_nf90( nf90_get_var( ncin, gphit_id, gphit, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 80 | CALL check_nf90( nf90_get_var( ncin, gphiu_id, gphiu, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 81 | CALL check_nf90( nf90_get_var( ncin, gphiv_id, gphiv, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 82 | CALL check_nf90( nf90_get_var( ncin, gphif_id, gphif, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 83 | CALL check_nf90( nf90_get_var( ncin, glamt_id, glamt, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 84 | CALL check_nf90( nf90_get_var( ncin, glamu_id, glamu, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 85 | CALL check_nf90( nf90_get_var( ncin, glamv_id, glamv, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 86 | CALL check_nf90( nf90_get_var( ncin, glamf_id, glamf, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 87 | CALL check_nf90( nf90_get_var( ncin, tmask_id, tmask, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 88 | CALL check_nf90( nf90_get_var( ncin, umask_id, umask, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 89 | CALL check_nf90( nf90_get_var( ncin, vmask_id, vmask, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 90 | CALL check_nf90( nf90_get_var( ncin, fmask_id, fmask, (/ 1,1 /), (/ jpi, jpj /) ) ) |
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| 91 | |
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[4739] | 92 | pdct(:,:) = 0._wp |
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[4738] | 93 | zxt(:,:) = COS( rad * gphit(:,:) ) * COS( rad * glamt(:,:) ) |
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| 94 | zyt(:,:) = COS( rad * gphit(:,:) ) * SIN( rad * glamt(:,:) ) |
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| 95 | zzt(:,:) = SIN( rad * gphit(:,:) ) |
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| 96 | |
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| 97 | |
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| 98 | ! Define the coastline points (U, V and F) |
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| 99 | DO jj = 2, jpj-1 |
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| 100 | DO ji = 2, jpi-1 |
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| 101 | zmask(ji,jj) = ( tmask(ji,jj+1) + tmask(ji+1,jj+1) & |
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| 102 | & + tmask(ji,jj ) + tmask(ji+1,jj ) ) |
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[4739] | 103 | llcotu(ji,jj) = ( tmask(ji,jj ) + tmask(ji+1,jj ) == 1._wp ) |
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| 104 | llcotv(ji,jj) = ( tmask(ji,jj ) + tmask(ji ,jj+1) == 1._wp ) |
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| 105 | llcotf(ji,jj) = ( zmask(ji,jj) > 0._wp ) .AND. ( zmask(ji,jj) < 4._wp ) |
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[4738] | 106 | END DO |
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| 107 | END DO |
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| 108 | |
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| 109 | ! Lateral boundaries conditions |
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| 110 | llcotu(:, 1 ) = umask(:, 2 ) == 1 |
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| 111 | llcotu(:,jpj) = umask(:,jpj-1) == 1 |
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| 112 | llcotv(:, 1 ) = vmask(:, 2 ) == 1 |
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| 113 | llcotv(:,jpj) = vmask(:,jpj-1) == 1 |
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| 114 | llcotf(:, 1 ) = fmask(:, 2 ) == 1 |
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| 115 | llcotf(:,jpj) = fmask(:,jpj-1) == 1 |
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| 116 | |
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| 117 | IF( jperio == 1 .OR. jperio == 4 .OR. jperio == 6 ) THEN |
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| 118 | llcotu( 1 ,:) = llcotu(jpi-1,:) |
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| 119 | llcotu(jpi,:) = llcotu( 2 ,:) |
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| 120 | llcotv( 1 ,:) = llcotv(jpi-1,:) |
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| 121 | llcotv(jpi,:) = llcotv( 2 ,:) |
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| 122 | llcotf( 1 ,:) = llcotf(jpi-1,:) |
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| 123 | llcotf(jpi,:) = llcotf( 2 ,:) |
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| 124 | ELSE |
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| 125 | llcotu( 1 ,:) = umask( 2 ,:) == 1 |
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| 126 | llcotu(jpi,:) = umask(jpi-1,:) == 1 |
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| 127 | llcotv( 1 ,:) = vmask( 2 ,:) == 1 |
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| 128 | llcotv(jpi,:) = vmask(jpi-1,:) == 1 |
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| 129 | llcotf( 1 ,:) = fmask( 2 ,:) == 1 |
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| 130 | llcotf(jpi,:) = fmask(jpi-1,:) == 1 |
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| 131 | ENDIF |
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| 132 | IF( jperio == 3 .OR. jperio == 4 ) THEN |
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| 133 | DO ji = 1, jpi-1 |
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| 134 | iju = jpi - ji + 1 |
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| 135 | llcotu(ji,jpj ) = llcotu(iju,jpj-2) |
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| 136 | llcotf(ji,jpj-1) = llcotf(iju,jpj-2) |
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| 137 | llcotf(ji,jpj ) = llcotf(iju,jpj-3) |
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| 138 | END DO |
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| 139 | DO ji = jpi/2, jpi-1 |
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| 140 | iju = jpi - ji + 1 |
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| 141 | llcotu(ji,jpj-1) = llcotu(iju,jpj-1) |
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| 142 | END DO |
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| 143 | DO ji = 2, jpi |
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| 144 | ijt = jpi - ji + 2 |
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| 145 | llcotv(ji,jpj-1) = llcotv(ijt,jpj-2) |
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| 146 | llcotv(ji,jpj ) = llcotv(ijt,jpj-3) |
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| 147 | END DO |
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| 148 | ENDIF |
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| 149 | IF( jperio == 5 .OR. jperio == 6 ) THEN |
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| 150 | DO ji = 1, jpi-1 |
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| 151 | iju = jpi - ji |
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| 152 | llcotu(ji,jpj ) = llcotu(iju,jpj-1) |
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| 153 | llcotf(ji,jpj ) = llcotf(iju,jpj-2) |
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| 154 | END DO |
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| 155 | DO ji = jpi/2, jpi-1 |
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| 156 | iju = jpi - ji |
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| 157 | llcotf(ji,jpj-1) = llcotf(iju,jpj-1) |
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| 158 | END DO |
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| 159 | DO ji = 1, jpi |
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| 160 | ijt = jpi - ji + 1 |
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| 161 | llcotv(ji,jpj ) = llcotv(ijt,jpj-1) |
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| 162 | END DO |
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| 163 | DO ji = jpi/2+1, jpi |
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| 164 | ijt = jpi - ji + 1 |
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| 165 | llcotv(ji,jpj-1) = llcotv(ijt,jpj-1) |
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| 166 | END DO |
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| 167 | ENDIF |
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| 168 | |
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| 169 | ! Compute cartesian coordinates of coastline points |
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| 170 | ! and the number of coastline points |
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| 171 | icoast = 0 |
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| 172 | DO jj = 1, jpj |
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| 173 | DO ji = 1, jpi |
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| 174 | IF( llcotf(ji,jj) ) THEN |
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| 175 | icoast = icoast + 1 |
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| 176 | zxc(icoast) = COS( rad*gphif(ji,jj) ) * COS( rad*glamf(ji,jj) ) |
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| 177 | zyc(icoast) = COS( rad*gphif(ji,jj) ) * SIN( rad*glamf(ji,jj) ) |
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| 178 | zzc(icoast) = SIN( rad*gphif(ji,jj) ) |
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| 179 | ENDIF |
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| 180 | IF( llcotu(ji,jj) ) THEN |
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| 181 | icoast = icoast+1 |
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| 182 | zxc(icoast) = COS( rad*gphiu(ji,jj) ) * COS( rad*glamu(ji,jj) ) |
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| 183 | zyc(icoast) = COS( rad*gphiu(ji,jj) ) * SIN( rad*glamu(ji,jj) ) |
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| 184 | zzc(icoast) = SIN( rad*gphiu(ji,jj) ) |
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| 185 | ENDIF |
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| 186 | IF( llcotv(ji,jj) ) THEN |
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| 187 | icoast = icoast+1 |
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| 188 | zxc(icoast) = COS( rad*gphiv(ji,jj) ) * COS( rad*glamv(ji,jj) ) |
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| 189 | zyc(icoast) = COS( rad*gphiv(ji,jj) ) * SIN( rad*glamv(ji,jj) ) |
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| 190 | zzc(icoast) = SIN( rad*gphiv(ji,jj) ) |
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| 191 | ENDIF |
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| 192 | END DO |
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| 193 | END DO |
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| 194 | |
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| 195 | ! Distance for the T-points |
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| 196 | DO jj = 1, jpj |
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| 197 | DO ji = 1, jpi |
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[4739] | 198 | IF( tmask(ji,jj) == 0._wp ) THEN |
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| 199 | pdct(ji,jj) = 0._wp |
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[4738] | 200 | ELSE |
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| 201 | DO jl = 1, icoast |
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| 202 | zdis(jl) = ( zxt(ji,jj) - zxc(jl) )**2 & |
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| 203 | & + ( zyt(ji,jj) - zyc(jl) )**2 & |
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| 204 | & + ( zzt(ji,jj) - zzc(jl) )**2 |
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| 205 | END DO |
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| 206 | pdct(ji,jj) = ra * SQRT( MINVAL( zdis(1:icoast) ) ) |
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| 207 | ENDIF |
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| 208 | END DO |
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| 209 | END DO |
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| 210 | |
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| 211 | DEALLOCATE( zxt , zyt , zzt , zmask ) |
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| 212 | DEALLOCATE(zxc, zyc, zzc, zdis ) |
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| 213 | DEALLOCATE( llcotu, llcotv, llcotf ) |
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| 214 | DEALLOCATE( gphiu, gphiv, gphif ) |
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| 215 | DEALLOCATE( glamu, glamv, glamf, glamt ) |
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| 216 | DEALLOCATE( umask, vmask, fmask ) |
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| 217 | |
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| 218 | END SUBROUTINE cofdis |
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| 219 | |
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| 220 | END MODULE coastdist |
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