[3] | 1 | MODULE zdfbfr |
---|
| 2 | !!====================================================================== |
---|
| 3 | !! *** MODULE zdfbfr *** |
---|
| 4 | !! Ocean physics: Bottom friction |
---|
| 5 | !!====================================================================== |
---|
| 6 | |
---|
| 7 | !!---------------------------------------------------------------------- |
---|
| 8 | !! zdf_bfr : update momentum Kz at the ocean bottom due to the |
---|
| 9 | !! type of bottom friction chosen |
---|
| 10 | !! zdf_bfr_init : read in namelist and control the bottom friction |
---|
| 11 | !! parameters. |
---|
| 12 | !!---------------------------------------------------------------------- |
---|
| 13 | !! * Modules used |
---|
| 14 | USE oce ! ocean dynamics and tracers variables |
---|
| 15 | USE dom_oce ! ocean space and time domain variables |
---|
| 16 | USE zdf_oce ! ocean vertical physics variables |
---|
| 17 | USE in_out_manager ! I/O manager |
---|
| 18 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
---|
| 19 | |
---|
| 20 | IMPLICIT NONE |
---|
| 21 | PRIVATE |
---|
| 22 | |
---|
| 23 | !! * Routine accessibility |
---|
| 24 | PUBLIC zdf_bfr ! called by step.F90 |
---|
| 25 | |
---|
| 26 | !! * Module variables |
---|
| 27 | INTEGER :: & !!! ** bottom friction namelist (nambfr) ** |
---|
| 28 | nbotfr = 0 ! = 0/1/2/3 type of bottom friction |
---|
| 29 | REAL(wp) :: & !!! ** bottom friction namelist (nambfr) ** |
---|
| 30 | bfri1 = 4.0e-4_wp, & ! bottom drag coefficient (linear case) |
---|
| 31 | bfri2 = 1.0e-3_wp, & ! bottom drag coefficient (non linear case) |
---|
| 32 | bfeb2 = 2.5e-3_wp ! background bottom turbulent kinetic energy (m2/s2) |
---|
| 33 | |
---|
| 34 | !! * Substitutions |
---|
| 35 | # include "domzgr_substitute.h90" |
---|
| 36 | !!---------------------------------------------------------------------- |
---|
| 37 | !! OPA 9.0 , LODYC-IPSL (2003) |
---|
| 38 | !!---------------------------------------------------------------------- |
---|
| 39 | |
---|
| 40 | CONTAINS |
---|
| 41 | |
---|
| 42 | SUBROUTINE zdf_bfr( kt ) |
---|
| 43 | !!---------------------------------------------------------------------- |
---|
| 44 | !! *** ROUTINE zdf_bfr *** |
---|
| 45 | !! |
---|
| 46 | !! ** Purpose : Applied the bottom friction through a specification of |
---|
| 47 | !! Kz at the ocean bottom. |
---|
| 48 | !! |
---|
| 49 | !! ** Method : Update the value of avmu and avmv at the ocean bottom |
---|
| 50 | !! level following the chosen friction type (no-slip, free-slip, |
---|
| 51 | !! linear, or quadratic) |
---|
| 52 | !! |
---|
| 53 | !! History : |
---|
| 54 | !! 8.0 ! 97-06 (G. Madec, A.-M. Treguier) Original code |
---|
| 55 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
---|
| 56 | !!---------------------------------------------------------------------- |
---|
| 57 | !! * Arguments |
---|
| 58 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
---|
| 59 | |
---|
| 60 | !! * Local declarations |
---|
| 61 | INTEGER :: & |
---|
| 62 | ji, jj, & ! dummy loop indexes |
---|
| 63 | ikbu, ikbv, & ! temporary integers |
---|
| 64 | ikbum1, ikbvm1 ! |
---|
| 65 | REAL(wp) :: & |
---|
| 66 | zvu, zuv, zecu, zecv ! temporary scalars |
---|
| 67 | !!---------------------------------------------------------------------- |
---|
| 68 | |
---|
| 69 | |
---|
| 70 | IF( kt == nit000 ) CALL zdf_bfr_init |
---|
| 71 | |
---|
| 72 | |
---|
| 73 | ! Compute avmu, avmv at the ocean bottom |
---|
| 74 | ! -------------------------------------- |
---|
| 75 | |
---|
| 76 | SELECT CASE (nbotfr) |
---|
| 77 | |
---|
| 78 | CASE( 0 ) ! no-slip boundary condition |
---|
| 79 | # if defined key_vectopt_loop && ! defined key_autotasking |
---|
| 80 | jj = 1 |
---|
| 81 | DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) |
---|
| 82 | # else |
---|
| 83 | DO jj = 2, jpjm1 |
---|
| 84 | DO ji = 2, jpim1 |
---|
| 85 | # endif |
---|
| 86 | ikbu = MIN( mbathy(ji+1,jj ), mbathy(ji,jj) ) |
---|
| 87 | ikbv = MIN( mbathy(ji ,jj+1), mbathy(ji,jj) ) |
---|
| 88 | ikbum1 = MAX( ikbu-1, 1 ) |
---|
| 89 | ikbvm1 = MAX( ikbv-1, 1 ) |
---|
| 90 | avmu(ji,jj,ikbu) = 2. * avmu(ji,jj,ikbum1) |
---|
| 91 | avmv(ji,jj,ikbv) = 2. * avmv(ji,jj,ikbvm1) |
---|
| 92 | # if ! defined key_vectopt_loop || defined key_autotasking |
---|
| 93 | END DO |
---|
| 94 | # endif |
---|
| 95 | END DO |
---|
| 96 | |
---|
| 97 | CASE( 1 ) ! linear botton friction |
---|
| 98 | # if defined key_vectopt_loop && ! defined key_autotasking |
---|
| 99 | jj = 1 |
---|
| 100 | DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) |
---|
| 101 | # else |
---|
| 102 | DO jj = 2, jpjm1 |
---|
| 103 | DO ji = 2, jpim1 |
---|
| 104 | # endif |
---|
| 105 | ikbu = MIN( mbathy(ji+1,jj), mbathy(ji,jj) ) |
---|
| 106 | ikbv = MIN( mbathy(ji,jj+1), mbathy(ji,jj) ) |
---|
| 107 | avmu(ji,jj,ikbu) = bfri1 * fse3uw(ji,jj,ikbu) |
---|
| 108 | avmv(ji,jj,ikbv) = bfri1 * fse3vw(ji,jj,ikbv) |
---|
| 109 | # if ! defined key_vectopt_loop || defined key_autotasking |
---|
| 110 | END DO |
---|
| 111 | # endif |
---|
| 112 | END DO |
---|
| 113 | |
---|
| 114 | CASE( 2 ) ! quadratic botton friction |
---|
| 115 | # if defined key_vectopt_loop && ! defined key_autotasking |
---|
| 116 | jj = 1 |
---|
| 117 | !CDIR NOVERRCHK |
---|
| 118 | DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) |
---|
| 119 | # else |
---|
| 120 | !CDIR NOVERRCHK |
---|
| 121 | DO jj = 2, jpjm1 |
---|
| 122 | !CDIR NOVERRCHK |
---|
| 123 | DO ji = 2, jpim1 |
---|
| 124 | # endif |
---|
| 125 | ikbu = MIN( mbathy(ji+1,jj ), mbathy(ji,jj) ) |
---|
| 126 | ikbv = MIN( mbathy(ji ,jj+1), mbathy(ji,jj) ) |
---|
| 127 | ikbum1 = MAX( ikbu-1, 1 ) |
---|
| 128 | ikbvm1 = MAX( ikbv-1, 1 ) |
---|
| 129 | |
---|
| 130 | zvu = 0.25 * ( vn(ji,jj ,ikbum1) + vn(ji+1,jj ,ikbum1) & |
---|
| 131 | + vn(ji,jj-1,ikbum1) + vn(ji+1,jj-1,ikbum1) ) |
---|
| 132 | |
---|
| 133 | zuv = 0.25 * ( un(ji,jj ,ikbvm1) + un(ji-1,jj ,ikbvm1) & |
---|
| 134 | + un(ji,jj+1,ikbvm1) + un(ji-1,jj+1,ikbvm1) ) |
---|
| 135 | |
---|
| 136 | zecu = SQRT( un(ji,jj,ikbum1) * un(ji,jj,ikbum1) + zvu*zvu + bfeb2 ) |
---|
| 137 | zecv = SQRT( vn(ji,jj,ikbvm1) * vn(ji,jj,ikbvm1) + zuv*zuv + bfeb2 ) |
---|
| 138 | |
---|
| 139 | avmu(ji,jj,ikbu) = bfri2 * zecu * fse3uw(ji,jj,ikbu) |
---|
| 140 | avmv(ji,jj,ikbv) = bfri2 * zecv * fse3vw(ji,jj,ikbv) |
---|
| 141 | # if ! defined key_vectopt_loop || defined key_autotasking |
---|
| 142 | END DO |
---|
| 143 | # endif |
---|
| 144 | END DO |
---|
| 145 | |
---|
| 146 | CASE( 3 ) ! free-slip boundary condition |
---|
| 147 | # if defined key_vectopt_loop && ! defined key_autotasking |
---|
| 148 | jj = 1 |
---|
| 149 | DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) |
---|
| 150 | # else |
---|
| 151 | DO jj = 2, jpjm1 |
---|
| 152 | DO ji = 2, jpim1 |
---|
| 153 | # endif |
---|
| 154 | ikbu = MIN( mbathy(ji+1,jj ), mbathy(ji,jj) ) |
---|
| 155 | ikbv = MIN( mbathy(ji ,jj+1), mbathy(ji,jj) ) |
---|
| 156 | avmu(ji,jj,ikbu) = 0.e0 |
---|
| 157 | avmv(ji,jj,ikbv) = 0.e0 |
---|
| 158 | # if ! defined key_vectopt_loop || defined key_autotasking |
---|
| 159 | END DO |
---|
| 160 | # endif |
---|
| 161 | END DO |
---|
| 162 | |
---|
| 163 | END SELECT |
---|
| 164 | |
---|
| 165 | ! Lateral boundary condition on (avmu,avmv) (unchanged sign) |
---|
| 166 | ! ------------------------------=========== |
---|
| 167 | CALL lbc_lnk( avmu, 'U', 1. ) |
---|
| 168 | CALL lbc_lnk( avmv, 'V', 1. ) |
---|
| 169 | |
---|
| 170 | END SUBROUTINE zdf_bfr |
---|
| 171 | |
---|
| 172 | |
---|
| 173 | SUBROUTINE zdf_bfr_init |
---|
| 174 | !!---------------------------------------------------------------------- |
---|
| 175 | !! *** ROUTINE zdf_bfr_init *** |
---|
| 176 | !! |
---|
| 177 | !! ** Purpose : Initialization of the bottom friction |
---|
| 178 | !! |
---|
| 179 | !! ** Method : Read the nammbf namelist and check their consistency |
---|
| 180 | !! called at the first timestep (nit000) |
---|
| 181 | !! |
---|
| 182 | !! History : |
---|
| 183 | !! 9.0 ! 02-06 (G. Madec) Original code |
---|
| 184 | !!---------------------------------------------------------------------- |
---|
| 185 | !! * Local declarations |
---|
| 186 | NAMELIST/nambfr/ nbotfr, bfri1, bfri2, bfeb2 |
---|
| 187 | !!---------------------------------------------------------------------- |
---|
| 188 | |
---|
| 189 | ! Read Namelist nambfr : bottom momentum boundary condition |
---|
| 190 | ! -------------------- |
---|
| 191 | REWIND ( numnam ) |
---|
| 192 | READ ( numnam, nambfr ) |
---|
| 193 | |
---|
| 194 | |
---|
| 195 | ! Parameter control and print |
---|
| 196 | ! --------------------------- |
---|
| 197 | IF(lwp) WRITE(numout,*) |
---|
| 198 | IF(lwp) WRITE(numout,*) 'zdf_bfr : momentum bottom friction' |
---|
| 199 | IF(lwp) WRITE(numout,*) '~~~~~~~' |
---|
| 200 | IF(lwp) WRITE(numout,*) ' Namelist nambfr : set bottom friction parameters' |
---|
| 201 | |
---|
| 202 | SELECT CASE (nbotfr) |
---|
| 203 | |
---|
| 204 | CASE( 0 ) |
---|
| 205 | IF(lwp) WRITE(numout,*) ' no-slip ' |
---|
| 206 | |
---|
| 207 | CASE( 1 ) |
---|
| 208 | IF(lwp) WRITE(numout,*) ' linear botton friction' |
---|
| 209 | IF(lwp) WRITE(numout,*) ' friction coef. bfri1 = ', bfri1 |
---|
| 210 | |
---|
| 211 | CASE( 2 ) |
---|
| 212 | IF(lwp) WRITE(numout,*) ' quadratic botton friction' |
---|
| 213 | IF(lwp) WRITE(numout,*) ' friction coef. bfri2 = ', bfri2 |
---|
| 214 | IF(lwp) WRITE(numout,*) ' background tke bfeb2 = ', bfeb2 |
---|
| 215 | |
---|
| 216 | CASE( 3 ) |
---|
| 217 | IF(lwp) WRITE(numout,*) ' free-slip ' |
---|
| 218 | |
---|
| 219 | CASE DEFAULT |
---|
| 220 | IF(lwp) WRITE(numout,cform_err) |
---|
| 221 | IF(lwp) WRITE(numout,*) ' bad flag value for nbotfr = ', nbotfr |
---|
| 222 | nstop = nstop + 1 |
---|
| 223 | |
---|
| 224 | END SELECT |
---|
| 225 | |
---|
| 226 | END SUBROUTINE zdf_bfr_init |
---|
| 227 | |
---|
| 228 | !!====================================================================== |
---|
| 229 | END MODULE zdfbfr |
---|