1 | MODULE bdyvol |
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2 | !!================================================================================= |
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3 | !! *** MODULE bdyvol *** |
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4 | !! Ocean dynamic : Volume constraint when unstructured boundary |
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5 | !! and Free surface are used |
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6 | !!================================================================================= |
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7 | #if defined key_bdy && defined key_dynspg_flt |
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8 | !!--------------------------------------------------------------------------------- |
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9 | !! 'key_bdy' and unstructured open boundary conditions |
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10 | !! 'key_dynspg_flt' constant volume free surface |
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11 | !!--------------------------------------------------------------------------------- |
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12 | !! * Modules used |
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13 | USE oce ! ocean dynamics and tracers |
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14 | USE dom_oce ! ocean space and time domain |
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15 | USE phycst ! physical constants |
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16 | USE bdy_oce ! ocean open boundary conditions |
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17 | USE lib_mpp ! for mppsum |
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18 | USE in_out_manager ! I/O manager |
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19 | USE sbc_oce ! ocean surface boundary conditions |
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20 | |
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21 | IMPLICIT NONE |
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22 | PRIVATE |
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23 | |
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24 | !! * Accessibility |
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25 | PUBLIC bdy_vol ! routine called by dynspg_flt.h90 |
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26 | |
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27 | !! * Substitutions |
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28 | # include "domzgr_substitute.h90" |
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29 | !!--------------------------------------------------------------------------------- |
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30 | !! OPA 9.0 , LODYC-IPSL (2003) |
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31 | !!--------------------------------------------------------------------------------- |
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32 | |
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33 | CONTAINS |
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34 | |
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35 | SUBROUTINE bdy_vol ( kt ) |
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36 | !!------------------------------------------------------------------------------ |
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37 | !! *** ROUTINE bdyvol *** |
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38 | !! |
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39 | !! ** Purpose : |
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40 | !! This routine is called in dynspg_flt to control |
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41 | !! the volume of the system. A correction velocity is calculated |
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42 | !! to correct the total transport through the unstructured OBC. |
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43 | !! The total depth used is constant (H0) to be consistent with the |
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44 | !! linear free surface coded in OPA 8.2 |
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45 | !! |
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46 | !! ** Method : |
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47 | !! The correction velocity (zubtpecor here) is defined calculating |
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48 | !! the total transport through all open boundaries (trans_bdy) minus |
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49 | !! the cumulate E-P flux (zCflxemp) divided by the total lateral |
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50 | !! surface (bdysurftot) of the unstructured boundary. |
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51 | !! |
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52 | !! zubtpecor = [trans_bdy - zCflxemp ]*(1./bdysurftot) |
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53 | !! |
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54 | !! with zCflxemp => sum of (Evaporation minus Precipitation) |
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55 | !! over all the domain in m3/s at each time step. |
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56 | !! |
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57 | !! zCflxemp < 0 when precipitation dominate |
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58 | !! zCflxemp > 0 when evaporation dominate |
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59 | !! |
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60 | !! There are 2 options (user's desiderata): |
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61 | !! |
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62 | !! 1/ The volume changes according to E-P, this is the default |
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63 | !! option. In this case the cumulate E-P flux are setting to |
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64 | !! zero (zCflxemp=0) to calculate the correction velocity. So |
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65 | !! it will only balance the flux through open boundaries. |
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66 | !! (set volbdy to 0 in tne namelist for this option) |
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67 | !! |
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68 | !! 2/ The volume is constant even with E-P flux. In this case |
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69 | !! the correction velocity must balance both the flux |
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70 | !! through open boundaries and the ones through the free |
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71 | !! surface. |
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72 | !! (set volbdy to 1 in tne namelist for this option) |
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73 | !! |
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74 | !! History : |
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75 | !! 8.5 ! 05-01 (J. Chanut, A. Sellar) Original code |
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76 | !! ! 06-01 (J. Chanut) Bug correction |
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77 | !!---------------------------------------------------------------------------- |
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78 | !! * Arguments |
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79 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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80 | |
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81 | !! * Local declarations |
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82 | INTEGER :: ji,jj,jb, jgrd, jk |
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83 | REAL(wp) :: zubtpecor |
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84 | REAL(wp) :: zCflxemp |
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85 | REAL(wp) :: ztranst |
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86 | !!----------------------------------------------------------------------------- |
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87 | |
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88 | IF( kt == nit000 ) THEN |
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89 | IF(lwp) WRITE(numout,*)' ' |
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90 | IF(lwp) WRITE(numout,*)'bdy_vol : Correction of velocities along unstructured OBC' |
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91 | IF(lwp) WRITE(numout,*)'~~~~~~~' |
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92 | IF(lwp) WRITE(numout,*)' ' |
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93 | END IF |
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94 | |
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95 | ! 1. Calculate the cumulate surface Flux zCflxemp (m3/s) over all the domain. |
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96 | ! --------------------------------------------------------------------------- |
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97 | |
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98 | zCflxemp = 0.e0 |
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99 | |
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100 | DO jj = 1, jpj |
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101 | DO ji = 1, jpi |
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102 | zCflxemp = zCflxemp + ( (emp(ji,jj)*bdytmask(ji,jj)*tmask_i(ji,jj) )/rauw) & |
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103 | *e1v(ji,jj)*e2u(ji,jj) |
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104 | END DO |
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105 | END DO |
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106 | IF( lk_mpp ) CALL mpp_sum( zCflxemp ) ! sum over the global domain |
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107 | |
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108 | ! 2. Barotropic velocity through the unstructured open boundary |
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109 | ! ------------------------------------------------------------- |
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110 | |
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111 | zubtpecor = 0.e0 |
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112 | |
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113 | jgrd = 2 ! cumulate u component contribution first |
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114 | DO jb = 1, nblenrim(jgrd) |
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115 | DO jk = 1, jpkm1 |
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116 | zubtpecor = zubtpecor + flagu(jb) * ua (nbi(jb,jgrd), nbj(jb,jgrd), jk) & |
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117 | * e2u(nbi(jb,jgrd), nbj(jb,jgrd)) & |
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118 | * fse3u(nbi(jb,jgrd), nbj(jb,jgrd), jk) |
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119 | END DO |
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120 | END DO |
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121 | |
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122 | jgrd = 3 ! then add v component contribution |
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123 | DO jb = 1, nblenrim(jgrd) |
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124 | DO jk = 1, jpkm1 |
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125 | zubtpecor = zubtpecor + flagv(jb) * va (nbi(jb,jgrd), nbj(jb,jgrd), jk) & |
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126 | * e1v(nbi(jb,jgrd), nbj(jb,jgrd)) & |
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127 | * fse3v(nbi(jb,jgrd), nbj(jb,jgrd), jk) |
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128 | END DO |
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129 | END DO |
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130 | |
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131 | IF( lk_mpp ) CALL mpp_sum( zubtpecor ) ! sum over the global domain |
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132 | |
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133 | |
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134 | ! 3. The normal velocity correction |
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135 | ! --------------------------------- |
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136 | |
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137 | IF (volbdy==1) THEN |
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138 | zubtpecor = (zubtpecor - zCflxemp)*(1./bdysurftot) |
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139 | ELSE |
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140 | zubtpecor = zubtpecor*(1./bdysurftot) |
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141 | END IF |
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142 | |
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143 | IF( lwp .AND. MOD( kt, nwrite ) == 0) THEN |
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144 | IF(lwp) WRITE(numout,*)' ' |
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145 | IF(lwp) WRITE(numout,*)'bdy_vol : time step :', kt |
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146 | IF(lwp) WRITE(numout,*)'~~~~~~~ ' |
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147 | IF(lwp) WRITE(numout,*)' ' |
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148 | IF(lwp) WRITE(numout,*)' cumulate flux EMP :', zCflxemp,' (m3/s)' |
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149 | IF(lwp) WRITE(numout,*)' total lateral surface of OBC :',bdysurftot,'(m2)' |
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150 | IF(lwp) WRITE(numout,*)' correction velocity zubtpecor :',zubtpecor,'(m/s)' |
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151 | IF(lwp) WRITE(numout,*)' ' |
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152 | END IF |
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153 | |
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154 | ! 4. Correction of the total velocity on the unstructured |
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155 | ! boundary to respect the mass flux conservation |
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156 | ! ------------------------------------------------------- |
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157 | |
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158 | ztranst = 0.e0 |
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159 | |
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160 | jgrd = 2 ! correct u component |
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161 | DO jb = 1, nblenrim(jgrd) |
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162 | DO jk = 1, jpkm1 |
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163 | ua(nbi(jb, jgrd), nbj(jb, jgrd), jk) = ua(nbi(jb, jgrd), nbj(jb, jgrd), jk) & |
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164 | -flagu(jb) * zubtpecor * umask(nbi(jb, jgrd), nbj(jb, jgrd), jk) |
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165 | ztranst = ztranst + flagu(jb) * ua (nbi(jb,jgrd), nbj(jb,jgrd), jk) & |
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166 | * e2u(nbi(jb,jgrd), nbj(jb,jgrd)) & |
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167 | * fse3u(nbi(jb,jgrd), nbj(jb,jgrd), jk) |
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168 | END DO |
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169 | END DO |
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170 | |
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171 | jgrd = 3 ! correct v component |
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172 | DO jb = 1, nblenrim(jgrd) |
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173 | DO jk = 1, jpkm1 |
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174 | va(nbi(jb, jgrd), nbj(jb, jgrd), jk) = va(nbi(jb, jgrd), nbj(jb, jgrd), jk) & |
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175 | -flagv(jb) * zubtpecor * vmask(nbi(jb, jgrd), nbj(jb, jgrd), jk) |
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176 | ztranst = ztranst + flagv(jb) * va (nbi(jb,jgrd), nbj(jb,jgrd), jk) & |
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177 | * e1v(nbi(jb,jgrd), nbj(jb,jgrd)) & |
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178 | * fse3v(nbi(jb,jgrd), nbj(jb,jgrd), jk) |
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179 | END DO |
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180 | END DO |
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181 | |
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182 | IF( lk_mpp ) CALL mpp_sum( ztranst ) ! sum over the global domain |
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183 | |
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184 | ! 5. Check the cumulate transport through unstructured OBC |
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185 | ! once barotropic velocities corrected |
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186 | ! -------------------------------------------------------- |
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187 | |
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188 | IF( lwp .AND. MOD( kt, nwrite ) == 0) THEN |
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189 | IF(lwp) WRITE(numout,*)' ' |
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190 | IF(lwp) WRITE(numout,*)' Cumulate transport ztranst =', ztranst,'(m3/s)' |
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191 | IF(lwp) WRITE(numout,*)' ' |
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192 | END IF |
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193 | |
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194 | END SUBROUTINE bdy_vol |
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195 | |
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196 | #else |
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197 | !!--------------------------------------------------------------------------------- |
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198 | !! Default option : Empty module |
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199 | !!--------------------------------------------------------------------------------- |
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200 | CONTAINS |
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201 | SUBROUTINE bdy_vol ! Empty routine |
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202 | END SUBROUTINE bdy_vol |
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203 | #endif |
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204 | |
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205 | !!================================================================================= |
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206 | END MODULE bdyvol |
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