1 |
C $Header: /u/gcmpack/MITgcm/pkg/down_slope/dwnslp_calc_flow.F,v 1.1 2008/08/17 02:01:27 jmc Exp $ |
2 |
C $Name: $ |
3 |
|
4 |
#include "DWNSLP_OPTIONS.h" |
5 |
|
6 |
CBOP |
7 |
C !ROUTINE: DWNSLP_CALC_FLOW |
8 |
C !INTERFACE: |
9 |
SUBROUTINE DWNSLP_CALC_FLOW( |
10 |
I bi, bj, kBottom, rho3d, |
11 |
I myTime, myIter, myThid ) |
12 |
C !DESCRIPTION: \bv |
13 |
C *==========================================================* |
14 |
C | SUBROUTINE DWNSLP_CALC_FLOW |
15 |
C | o Detect active site of Down-Sloping flow and compute |
16 |
C | the corresponding volume transport |
17 |
C *==========================================================* |
18 |
C \ev |
19 |
|
20 |
C !USES: |
21 |
IMPLICIT NONE |
22 |
|
23 |
C === Global variables === |
24 |
#include "SIZE.h" |
25 |
#include "EEPARAMS.h" |
26 |
#include "PARAMS.h" |
27 |
#include "DWNSLP_SIZE.h" |
28 |
#include "DWNSLP_PARAMS.h" |
29 |
#include "DWNSLP_VARS.h" |
30 |
|
31 |
C !INPUT/OUTPUT PARAMETERS: |
32 |
C === Routine arguments === |
33 |
C bi,bj :: Tile indices |
34 |
C kBottom :: Vertical index of bottom grid cell. |
35 |
C rho3d :: In-situ density [kg/m3] computed at z=rC ; |
36 |
C myTime :: Current time in simulation |
37 |
C myIter :: Current time-step number |
38 |
C myThid :: my Thread Id number |
39 |
INTEGER bi, bj |
40 |
INTEGER kBottom( xySize, nSx,nSy ) |
41 |
_RL rho3d ( xySize, Nr,nSx,nSy ) |
42 |
_RL myTime |
43 |
INTEGER myIter, myThid |
44 |
|
45 |
#ifdef ALLOW_DOWN_SLOPE |
46 |
|
47 |
C !LOCAL VARIABLES: |
48 |
C === Local variables === |
49 |
C msgBuf :: Informational/error meesage buffer |
50 |
C ijd :: horiz. index of deep water column receiving dense water flow |
51 |
C ijs :: horiz. index of shallow water column (e.g. shelf) |
52 |
C from which dense water flow originates |
53 |
c CHARACTER*(MAX_LEN_MBUF) msgBuf |
54 |
INTEGER k |
55 |
INTEGER n, ijd, ijr, ijs |
56 |
INTEGER kdeep, ishelf, jshelf, kshelf |
57 |
_RL dRhoH |
58 |
INTEGER downward |
59 |
#ifdef ALLOW_DIAGNOSTICS |
60 |
LOGICAL doDiagDwnSlpFlow |
61 |
INTEGER ij |
62 |
_RL sgnFac |
63 |
_RL uFlow( xySize ) |
64 |
_RL vFlow( xySize ) |
65 |
C- Functions: |
66 |
LOGICAL DIAGNOSTICS_IS_ON |
67 |
EXTERNAL DIAGNOSTICS_IS_ON |
68 |
#endif /* ALLOW_DIAGNOSTICS */ |
69 |
|
70 |
CEOP |
71 |
|
72 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
73 |
|
74 |
c downward = rkSign*NINT(gravitySign) |
75 |
downward = 1 |
76 |
IF ( usingPCoords ) downward = -1 |
77 |
|
78 |
#ifdef ALLOW_DIAGNOSTICS |
79 |
IF ( useDiagnostics ) THEN |
80 |
doDiagDwnSlpFlow = DIAGNOSTICS_IS_ON( 'DSLPuFlw', myThid ) |
81 |
& .OR. DIAGNOSTICS_IS_ON( 'DSLPvFlw', myThid ) |
82 |
IF ( doDiagDwnSlpFlow ) THEN |
83 |
DO ij=1,xySize |
84 |
uFlow(ij) = 0. _d 0 |
85 |
vFlow(ij) = 0. _d 0 |
86 |
ENDDO |
87 |
ENDIF |
88 |
ELSE |
89 |
doDiagDwnSlpFlow = .FALSE. |
90 |
ENDIF |
91 |
#endif /* ALLOW_DIAGNOSTICS */ |
92 |
|
93 |
DO n=1,DWNSLP_NbSite(bi,bj) |
94 |
DWNSLP_deepK(n,bi,bj) = 0 |
95 |
|
96 |
C- detect density dradient along the slope => Downsloping flow |
97 |
|
98 |
ijd = DWNSLP_ijDeep(n,bi,bj) |
99 |
ijr = DWNSLP_shVsD(n,bi,bj) |
100 |
ijs = ijd + ijr |
101 |
kshelf = kBottom(ijs,bi,bj) |
102 |
|
103 |
dRhoH = rho3d(ijs,kshelf,bi,bj) |
104 |
& -rho3d(ijd,kshelf,bi,bj) |
105 |
c IF ( dRhoH.GT.0. _d 0 ) THEN |
106 |
IF ( rho3d(ijs,kshelf+1,bi,bj).GT.rho3d(ijd,kshelf+1,bi,bj) |
107 |
& .AND. dRhoH.GT.0. _d 0 ) THEN |
108 |
|
109 |
C- search for deepest level where Rho_shelf > Rho_deep |
110 |
kdeep = kshelf |
111 |
DO k=kshelf+1,kBottom(ijd,bi,bj),downward |
112 |
IF ( rho3d(ijs,k,bi,bj).GT.rho3d(ijd,k,bi,bj) ) kdeep = k |
113 |
ENDDO |
114 |
DWNSLP_deepK(n,bi,bj) = kdeep |
115 |
|
116 |
C- Compute the Volume Transport : |
117 |
C- same formulation as described in the paper: |
118 |
c downslpFlow = DWNSLP_gamma/mu *gravity*dRhoH*recip_rhoConst |
119 |
C with DWNSLP_Gamma = slope * effective cross-section area |
120 |
DWNSLP_Transp(n,bi,bj) = DWNSLP_Gamma(n,bi,bj) |
121 |
& *DWNSLP_rec_mu*gravity*dRhoH*recip_rhoConst |
122 |
|
123 |
#ifdef ALLOW_DIAGNOSTICS |
124 |
IF ( doDiagDwnSlpFlow ) THEN |
125 |
ij = MAX( ijd, ijs ) |
126 |
sgnFac = SIGN(1,-ijr) |
127 |
IF ( ABS(ijr).EQ.1 ) THEN |
128 |
uFlow(ij) = sgnFac*DWNSLP_Transp(n,bi,bj) |
129 |
ELSE |
130 |
vFlow(ij) = sgnFac*DWNSLP_Transp(n,bi,bj) |
131 |
ENDIF |
132 |
ENDIF |
133 |
#endif /* ALLOW_DIAGNOSTICS */ |
134 |
|
135 |
ENDIF |
136 |
|
137 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
138 |
ENDDO |
139 |
|
140 |
IF (debugMode) THEN |
141 |
WRITE(DWNSLP_ioUnit,'(A,I8,2I4)') |
142 |
& ' DWNSLP_CALC_FLOW: iter,bi,bj=',myIter,bi,bj |
143 |
WRITE(DWNSLP_ioUnit,'(A)') |
144 |
& ' bi bj n : ijd ijr is js ; ks kd-s Transp :' |
145 |
DO n=1,DWNSLP_NbSite(bi,bj) |
146 |
IF (DWNSLP_deepK(n,bi,bj).NE.0) THEN |
147 |
ijs = DWNSLP_ijDeep(n,bi,bj) + DWNSLP_shVsD(n,bi,bj) |
148 |
ishelf = 1-OLx + mod(ijs-1,xSize) |
149 |
jshelf = 1-OLy + (ijs-1)/xSize |
150 |
kshelf = kBottom(ijs,bi,bj) |
151 |
WRITE(DWNSLP_ioUnit,'(2I4,I6,A,I8,I6,2I4,A,2I4,1PE14.6)') |
152 |
& bi,bj,n,' :', DWNSLP_ijDeep(n,bi,bj), |
153 |
& DWNSLP_shVsD(n,bi,bj), ishelf,jshelf, |
154 |
& ' ;', kshelf, DWNSLP_deepK(n,bi,bj)-kshelf, |
155 |
& DWNSLP_Transp(n,bi,bj) |
156 |
ENDIF |
157 |
ENDDO |
158 |
WRITE(DWNSLP_ioUnit,*) |
159 |
ENDIF |
160 |
|
161 |
#ifdef ALLOW_DIAGNOSTICS |
162 |
IF ( doDiagDwnSlpFlow ) THEN |
163 |
CALL DIAGNOSTICS_FILL( uFlow, 'DSLPuFlw', 0,1,2,bi,bj,myThid ) |
164 |
CALL DIAGNOSTICS_FILL( vFlow, 'DSLPvFlw', 0,1,2,bi,bj,myThid ) |
165 |
ENDIF |
166 |
#endif /* ALLOW_DIAGNOSTICS */ |
167 |
|
168 |
#endif /* ALLOW_DOWN_SLOPE */ |
169 |
|
170 |
RETURN |
171 |
END |