| 1 |
C $Header: /u/gcmpack/MITgcm/pkg/shelfice/shelfice_v_drag.F,v 1.5 2006/09/01 10:17:17 mlosch Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "SHELFICE_OPTIONS.h" |
| 5 |
#include "MOM_COMMON_OPTIONS.h" |
| 6 |
|
| 7 |
CBOP |
| 8 |
C !ROUTINE: SHELFICE_V_DRAG |
| 9 |
|
| 10 |
C !INTERFACE: ========================================================== |
| 11 |
SUBROUTINE SHELFICE_V_DRAG( |
| 12 |
I bi,bj,k, |
| 13 |
I vFld, KE, KappaRV, |
| 14 |
O vDragTerms, |
| 15 |
I myThid) |
| 16 |
|
| 17 |
C !DESCRIPTION: |
| 18 |
C Calculates the drag due to friction and the no-slip condition at the |
| 19 |
C bottom of the shelf-ice (in analogy to bottom drag) |
| 20 |
C \begin{equation*} |
| 21 |
C G^v_{drag} = - ( r_b + C_D |v| + \frac{2}{\Delta r_c} ) v |
| 22 |
C \end{equation*} |
| 23 |
|
| 24 |
C !USES: =============================================================== |
| 25 |
IMPLICIT NONE |
| 26 |
#include "SIZE.h" |
| 27 |
#include "EEPARAMS.h" |
| 28 |
#include "PARAMS.h" |
| 29 |
#include "GRID.h" |
| 30 |
#include "SHELFICE.h" |
| 31 |
|
| 32 |
C !INPUT PARAMETERS: =================================================== |
| 33 |
C bi,bj :: tile indices |
| 34 |
C k :: vertical level |
| 35 |
C vFld :: meridional flow |
| 36 |
C KE :: Kinetic energy |
| 37 |
C KappaRV :: vertical viscosity |
| 38 |
C myThid :: thread number |
| 39 |
INTEGER bi,bj,k |
| 40 |
_RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 41 |
_RL KE(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 42 |
_RL KappaRV(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
| 43 |
INTEGER myThid |
| 44 |
|
| 45 |
C !OUTPUT PARAMETERS: ================================================== |
| 46 |
C vDragTerms :: drag term |
| 47 |
_RL vDragTerms(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 48 |
|
| 49 |
#ifdef ALLOW_SHELFICE |
| 50 |
C !LOCAL VARIABLES : ==================================================== |
| 51 |
C i,j :: loop indices |
| 52 |
C Kp1 :: =k+1 for k<Nr, =Nr for k>=Nr |
| 53 |
INTEGER I,J,kUp,kUpC,kTop |
| 54 |
_RL viscFac |
| 55 |
_RL rdrckp1,maskUp |
| 56 |
CEOP |
| 57 |
|
| 58 |
C- No-slip BCs impose a drag at top |
| 59 |
IF ( usingZCoords ) THEN |
| 60 |
kTop = 1 |
| 61 |
kUp = max(k-1,kTop) |
| 62 |
kUpC = k |
| 63 |
ELSE |
| 64 |
kTop = Nr |
| 65 |
kUp = min(k+1,kTop) |
| 66 |
kUpC = kUp |
| 67 |
ENDIF |
| 68 |
rdrckp1=recip_drC(kUpC) |
| 69 |
CML IF (k.EQ.kTop) rdrckp1=recip_drF(k) |
| 70 |
viscFac=0. |
| 71 |
IF (no_slip_shelfice) viscFac=1. |
| 72 |
DO j=1-Oly+1,sNy+Oly-1 |
| 73 |
DO i=1-Olx,sNx+Olx-1 |
| 74 |
maskUp=_maskS(i,j,kUp,bi,bj) |
| 75 |
CML IF (k.EQ.kTop) maskUp=0. |
| 76 |
vDragTerms(i,j)= |
| 77 |
& -_recip_hFacS(i,j,k,bi,bj)*recip_drF(k) |
| 78 |
& *( |
| 79 |
& - 2.*KappaRV(i,j,kUpC)*rdrckp1*viscFac |
| 80 |
& + bottomDragLinear |
| 81 |
& )*(1.-maskUp)*vFld(i,j) |
| 82 |
IF ( (KE(i,j)+KE(i,j-1)) .NE. 0. ) THEN |
| 83 |
vDragTerms(i,j)=vDragTerms(i,j) |
| 84 |
& -_recip_hFacS(i,j,k,bi,bj)*recip_drF(k) |
| 85 |
& *bottomDragQuadratic*sqrt(KE(i,j)+KE(i,j-1)) |
| 86 |
& *(1.-maskUp)*vFld(i,j) |
| 87 |
ENDIF |
| 88 |
ENDDO |
| 89 |
ENDDO |
| 90 |
|
| 91 |
#ifdef ALLOW_DIAGNOSTICS |
| 92 |
IF (useDiagnostics) THEN |
| 93 |
CALL DIAGNOSTICS_FILL(vDragTerms,'VSHIDrag',k,1,2,bi,bj,myThid) |
| 94 |
ENDIF |
| 95 |
#endif /* ALLOW_DIAGNOSTICS */ |
| 96 |
#endif /* ALLOW_SHELFICE */ |
| 97 |
|
| 98 |
RETURN |
| 99 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph