[3] | 1 | MODULE zdfbfr |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE zdfbfr *** |
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| 4 | !! Ocean physics: Bottom friction |
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| 5 | !!====================================================================== |
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| 6 | |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | !! zdf_bfr : update momentum Kz at the ocean bottom due to the |
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| 9 | !! type of bottom friction chosen |
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| 10 | !! zdf_bfr_init : read in namelist and control the bottom friction |
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| 11 | !! parameters. |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | !! * Modules used |
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| 14 | USE oce ! ocean dynamics and tracers variables |
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| 15 | USE dom_oce ! ocean space and time domain variables |
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| 16 | USE zdf_oce ! ocean vertical physics variables |
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| 17 | USE in_out_manager ! I/O manager |
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| 18 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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[258] | 19 | USE prtctl ! Print control |
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[3] | 20 | |
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| 21 | IMPLICIT NONE |
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| 22 | PRIVATE |
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| 23 | |
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| 24 | !! * Routine accessibility |
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| 25 | PUBLIC zdf_bfr ! called by step.F90 |
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| 26 | |
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| 27 | !! * Module variables |
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| 28 | INTEGER :: & !!! ** bottom friction namelist (nambfr) ** |
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| 29 | nbotfr = 0 ! = 0/1/2/3 type of bottom friction |
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| 30 | REAL(wp) :: & !!! ** bottom friction namelist (nambfr) ** |
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| 31 | bfri1 = 4.0e-4_wp, & ! bottom drag coefficient (linear case) |
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| 32 | bfri2 = 1.0e-3_wp, & ! bottom drag coefficient (non linear case) |
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| 33 | bfeb2 = 2.5e-3_wp ! background bottom turbulent kinetic energy (m2/s2) |
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| 34 | |
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| 35 | !! * Substitutions |
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| 36 | # include "domzgr_substitute.h90" |
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| 37 | !!---------------------------------------------------------------------- |
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[247] | 38 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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| 39 | !! $Header$ |
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| 40 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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[3] | 41 | !!---------------------------------------------------------------------- |
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| 42 | |
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| 43 | CONTAINS |
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| 44 | |
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| 45 | SUBROUTINE zdf_bfr( kt ) |
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| 46 | !!---------------------------------------------------------------------- |
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| 47 | !! *** ROUTINE zdf_bfr *** |
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| 48 | !! |
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| 49 | !! ** Purpose : Applied the bottom friction through a specification of |
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| 50 | !! Kz at the ocean bottom. |
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| 51 | !! |
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| 52 | !! ** Method : Update the value of avmu and avmv at the ocean bottom |
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| 53 | !! level following the chosen friction type (no-slip, free-slip, |
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| 54 | !! linear, or quadratic) |
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| 55 | !! |
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| 56 | !! History : |
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| 57 | !! 8.0 ! 97-06 (G. Madec, A.-M. Treguier) Original code |
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| 58 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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| 59 | !!---------------------------------------------------------------------- |
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| 60 | !! * Arguments |
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| 61 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| 62 | |
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| 63 | !! * Local declarations |
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| 64 | INTEGER :: & |
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| 65 | ji, jj, & ! dummy loop indexes |
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| 66 | ikbu, ikbv, & ! temporary integers |
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| 67 | ikbum1, ikbvm1 ! |
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| 68 | REAL(wp) :: & |
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| 69 | zvu, zuv, zecu, zecv ! temporary scalars |
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| 70 | !!---------------------------------------------------------------------- |
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| 71 | |
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| 72 | |
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| 73 | IF( kt == nit000 ) CALL zdf_bfr_init |
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| 74 | |
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| 75 | |
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| 76 | ! Compute avmu, avmv at the ocean bottom |
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| 77 | ! -------------------------------------- |
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| 78 | |
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| 79 | SELECT CASE (nbotfr) |
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| 80 | |
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| 81 | CASE( 0 ) ! no-slip boundary condition |
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[463] | 82 | # if defined key_vectopt_loop && ! defined key_mpp_omp |
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[3] | 83 | jj = 1 |
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| 84 | DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) |
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| 85 | # else |
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| 86 | DO jj = 2, jpjm1 |
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| 87 | DO ji = 2, jpim1 |
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| 88 | # endif |
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| 89 | ikbu = MIN( mbathy(ji+1,jj ), mbathy(ji,jj) ) |
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| 90 | ikbv = MIN( mbathy(ji ,jj+1), mbathy(ji,jj) ) |
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| 91 | ikbum1 = MAX( ikbu-1, 1 ) |
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| 92 | ikbvm1 = MAX( ikbv-1, 1 ) |
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| 93 | avmu(ji,jj,ikbu) = 2. * avmu(ji,jj,ikbum1) |
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| 94 | avmv(ji,jj,ikbv) = 2. * avmv(ji,jj,ikbvm1) |
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[463] | 95 | # if ! defined key_vectopt_loop || defined key_mpp_omp |
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[3] | 96 | END DO |
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| 97 | # endif |
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| 98 | END DO |
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| 99 | |
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| 100 | CASE( 1 ) ! linear botton friction |
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[463] | 101 | # if defined key_vectopt_loop && ! defined key_mpp_omp |
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[3] | 102 | jj = 1 |
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| 103 | DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) |
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| 104 | # else |
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| 105 | DO jj = 2, jpjm1 |
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| 106 | DO ji = 2, jpim1 |
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| 107 | # endif |
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| 108 | ikbu = MIN( mbathy(ji+1,jj), mbathy(ji,jj) ) |
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| 109 | ikbv = MIN( mbathy(ji,jj+1), mbathy(ji,jj) ) |
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| 110 | avmu(ji,jj,ikbu) = bfri1 * fse3uw(ji,jj,ikbu) |
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| 111 | avmv(ji,jj,ikbv) = bfri1 * fse3vw(ji,jj,ikbv) |
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[463] | 112 | # if ! defined key_vectopt_loop || defined key_mpp_omp |
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[3] | 113 | END DO |
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| 114 | # endif |
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| 115 | END DO |
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| 116 | |
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| 117 | CASE( 2 ) ! quadratic botton friction |
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[463] | 118 | # if defined key_vectopt_loop && ! defined key_mpp_omp |
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[3] | 119 | jj = 1 |
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| 120 | !CDIR NOVERRCHK |
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| 121 | DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) |
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| 122 | # else |
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| 123 | !CDIR NOVERRCHK |
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| 124 | DO jj = 2, jpjm1 |
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| 125 | !CDIR NOVERRCHK |
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| 126 | DO ji = 2, jpim1 |
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| 127 | # endif |
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| 128 | ikbu = MIN( mbathy(ji+1,jj ), mbathy(ji,jj) ) |
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| 129 | ikbv = MIN( mbathy(ji ,jj+1), mbathy(ji,jj) ) |
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| 130 | ikbum1 = MAX( ikbu-1, 1 ) |
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| 131 | ikbvm1 = MAX( ikbv-1, 1 ) |
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| 132 | |
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| 133 | zvu = 0.25 * ( vn(ji,jj ,ikbum1) + vn(ji+1,jj ,ikbum1) & |
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| 134 | + vn(ji,jj-1,ikbum1) + vn(ji+1,jj-1,ikbum1) ) |
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| 135 | |
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| 136 | zuv = 0.25 * ( un(ji,jj ,ikbvm1) + un(ji-1,jj ,ikbvm1) & |
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| 137 | + un(ji,jj+1,ikbvm1) + un(ji-1,jj+1,ikbvm1) ) |
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| 138 | |
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| 139 | zecu = SQRT( un(ji,jj,ikbum1) * un(ji,jj,ikbum1) + zvu*zvu + bfeb2 ) |
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| 140 | zecv = SQRT( vn(ji,jj,ikbvm1) * vn(ji,jj,ikbvm1) + zuv*zuv + bfeb2 ) |
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| 141 | |
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| 142 | avmu(ji,jj,ikbu) = bfri2 * zecu * fse3uw(ji,jj,ikbu) |
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| 143 | avmv(ji,jj,ikbv) = bfri2 * zecv * fse3vw(ji,jj,ikbv) |
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[463] | 144 | # if ! defined key_vectopt_loop || defined key_mpp_omp |
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[3] | 145 | END DO |
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| 146 | # endif |
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| 147 | END DO |
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| 148 | |
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| 149 | CASE( 3 ) ! free-slip boundary condition |
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[463] | 150 | # if defined key_vectopt_loop && ! defined key_mpp_omp |
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[3] | 151 | jj = 1 |
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| 152 | DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) |
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| 153 | # else |
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| 154 | DO jj = 2, jpjm1 |
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| 155 | DO ji = 2, jpim1 |
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| 156 | # endif |
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| 157 | ikbu = MIN( mbathy(ji+1,jj ), mbathy(ji,jj) ) |
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| 158 | ikbv = MIN( mbathy(ji ,jj+1), mbathy(ji,jj) ) |
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| 159 | avmu(ji,jj,ikbu) = 0.e0 |
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| 160 | avmv(ji,jj,ikbv) = 0.e0 |
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[463] | 161 | # if ! defined key_vectopt_loop || defined key_mpp_omp |
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[3] | 162 | END DO |
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| 163 | # endif |
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| 164 | END DO |
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| 165 | |
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| 166 | END SELECT |
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| 167 | |
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| 168 | ! Lateral boundary condition on (avmu,avmv) (unchanged sign) |
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| 169 | ! ------------------------------=========== |
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| 170 | CALL lbc_lnk( avmu, 'U', 1. ) |
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| 171 | CALL lbc_lnk( avmv, 'V', 1. ) |
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| 172 | |
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[516] | 173 | IF(ln_ctl) THEN |
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| 174 | CALL prt_ctl(tab3d_1=avmu, clinfo1=' bfr - u: ', mask1=umask, & |
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| 175 | & tab3d_2=avmv, clinfo2= ' v: ', mask2=vmask,ovlap=1, kdim=jpk) |
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[258] | 176 | ENDIF |
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[49] | 177 | |
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[3] | 178 | END SUBROUTINE zdf_bfr |
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| 179 | |
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| 180 | |
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| 181 | SUBROUTINE zdf_bfr_init |
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| 182 | !!---------------------------------------------------------------------- |
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| 183 | !! *** ROUTINE zdf_bfr_init *** |
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| 184 | !! |
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| 185 | !! ** Purpose : Initialization of the bottom friction |
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| 186 | !! |
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| 187 | !! ** Method : Read the nammbf namelist and check their consistency |
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| 188 | !! called at the first timestep (nit000) |
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| 189 | !! |
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| 190 | !! History : |
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| 191 | !! 9.0 ! 02-06 (G. Madec) Original code |
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| 192 | !!---------------------------------------------------------------------- |
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| 193 | !! * Local declarations |
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| 194 | NAMELIST/nambfr/ nbotfr, bfri1, bfri2, bfeb2 |
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| 195 | !!---------------------------------------------------------------------- |
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| 196 | |
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| 197 | ! Read Namelist nambfr : bottom momentum boundary condition |
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| 198 | ! -------------------- |
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| 199 | REWIND ( numnam ) |
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| 200 | READ ( numnam, nambfr ) |
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| 201 | |
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| 202 | |
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| 203 | ! Parameter control and print |
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| 204 | ! --------------------------- |
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| 205 | IF(lwp) WRITE(numout,*) |
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| 206 | IF(lwp) WRITE(numout,*) 'zdf_bfr : momentum bottom friction' |
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| 207 | IF(lwp) WRITE(numout,*) '~~~~~~~' |
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| 208 | IF(lwp) WRITE(numout,*) ' Namelist nambfr : set bottom friction parameters' |
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| 209 | |
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| 210 | SELECT CASE (nbotfr) |
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| 211 | |
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| 212 | CASE( 0 ) |
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| 213 | IF(lwp) WRITE(numout,*) ' no-slip ' |
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| 214 | |
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| 215 | CASE( 1 ) |
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| 216 | IF(lwp) WRITE(numout,*) ' linear botton friction' |
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| 217 | IF(lwp) WRITE(numout,*) ' friction coef. bfri1 = ', bfri1 |
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| 218 | |
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| 219 | CASE( 2 ) |
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| 220 | IF(lwp) WRITE(numout,*) ' quadratic botton friction' |
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| 221 | IF(lwp) WRITE(numout,*) ' friction coef. bfri2 = ', bfri2 |
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| 222 | IF(lwp) WRITE(numout,*) ' background tke bfeb2 = ', bfeb2 |
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| 223 | |
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| 224 | CASE( 3 ) |
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| 225 | IF(lwp) WRITE(numout,*) ' free-slip ' |
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| 226 | |
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| 227 | CASE DEFAULT |
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[474] | 228 | WRITE(ctmp1,*) ' bad flag value for nbotfr = ', nbotfr |
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| 229 | CALL ctl_stop( ctmp1 ) |
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[3] | 230 | |
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| 231 | END SELECT |
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| 232 | |
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| 233 | END SUBROUTINE zdf_bfr_init |
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| 234 | |
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| 235 | !!====================================================================== |
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| 236 | END MODULE zdfbfr |
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