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streamice_visc_beta_hybrid.F
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streamice_visc_beta_hybrid.F
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C $Header: /u/gcmpack/MITgcm/pkg/streamice/streamice_visc_beta_hybrid.F,v 1.4 2014/04/24 16:37:51 dgoldberg Exp $
C $Name: $
#include "STREAMICE_OPTIONS.h"
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
CBOP
SUBROUTINE STREAMICE_VISC_BETA_HYBRID ( myThid )
C /============================================================\
C | SUBROUTINE |
C | o |
C |============================================================|
C | |
C \============================================================/
IMPLICIT NONE
C === Global variables ===
#include "SIZE.h"
#include "GRID.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "STREAMICE.h"
#include "STREAMICE_CG.h"
#ifdef ALLOW_AUTODIFF_TAMC
# include "tamc.h"
#endif
C !INPUT/OUTPUT ARGUMENTS
INTEGER myThid
! _RL taudx (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
! _RL taudx (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
#ifdef ALLOW_STREAMICE
#ifdef STREAMICE_HYBRID_STRESS
C LOCAL VARIABLES
INTEGER i, j, bi, bj, k, l, m
INTEGER ikey_1
_RL ux, uy, vx, vy, exx, eyy, exy, unorm, second_inv
_RL ub, vb, fb, mean_u_shear, mean_v_shear, umid, vmid
_RL omega_temp (Nr+1), u_shear(Nr+1), v_shear(Nr+1)
_RL STREAMICE_BSTRESS_EXP
! _RL total_vol_out
external STREAMICE_BSTRESS_EXP
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO j=1,sNy
DO i=1,sNx
IF (STREAMICE_hmask(i,j,bi,bj).eq.1) THEN
umid = 0
vmid = 0
DO k=0,1
DO l=0,1
umid = umid + 0.25 *
& dxG(i,j+l,bi,bj)*dyG(i+k,j,bi,bj) *
& recip_rA(i,j,bi,bj) *
& U_streamice(i+k,j+l,bi,bj)
vmid = vmid + 0.25 *
& dxG(i,j+l,bi,bj)*dyG(i+k,j,bi,bj) *
& recip_rA(i,j,bi,bj) *
& V_streamice(i+k,j+l,bi,bj)
ENDDO
ENDDO
ux = (U_streamice(i+1,j+1,bi,bj) +
& U_streamice(i+1,j,bi,bj) -
& U_streamice(i,j+1,bi,bj) -
& U_streamice(i,j,bi,bj)) /
& (2. * dxF(i,j,bi,bj))
vx = (V_streamice(i+1,j+1,bi,bj) +
& V_streamice(i+1,j,bi,bj) -
& V_streamice(i,j+1,bi,bj) -
& V_streamice(i,j,bi,bj)) /
& (2. * dxF(i,j,bi,bj))
uy = (U_streamice(i+1,j+1,bi,bj) -
& U_streamice(i+1,j,bi,bj) +
& U_streamice(i,j+1,bi,bj) -
& U_streamice(i,j,bi,bj)) /
& (2. * dyF(i,j,bi,bj))
vy = (V_streamice(i+1,j+1,bi,bj) -
& V_streamice(i+1,j,bi,bj) +
& V_streamice(i,j+1,bi,bj) -
& V_streamice(i,j,bi,bj)) /
& (2. * dyF(i,j,bi,bj))
exx = ux + k1AtC_str(i,j,bi,bj)*vmid
eyy = vy + k2AtC_str(i,j,bi,bj)*umid
exy = .5*(uy+vx) +
& k1AtC_str(i,j,bi,bj)*umid + k2AtC_str(i,j,bi,bj)*vmid
visc_streamice (i,j,bi,bj) = 0.0
streamice_omega(i,j,bi,bj) = 0.0
omega_temp (Nr+1) = 0.0
u_shear(Nr+1) = 0.0
v_shear(Nr+1) = 0.0
DO m=Nr,1,-1
#ifdef ALLOW_AUTODIFF_TAMC
act1 = bi - myBxLo(myThid)
max1 = myBxHi(myThid) - myBxLo(myThid) + 1
act2 = bj - myByLo(myThid)
max2 = myByHi(myThid) - myByLo(myThid) + 1
act3 = myThid - 1
max3 = nTx*nTy
act4 = ikey_dynamics - 1
ikey_1 = m
& + Nr*(i-1)
& + Nr*sNx*(j-1)
& + Nr*sNx*sNy*act1
& + Nr*sNx*sNy*max1*act2
& + Nr*sNx*sNy*max1*max2*act3
& + Nr*sNx*sNy*max1*max2*max3*act4
CADJ STORE visc_streamice_full(i,j,m,bi,bj)
CADJ & = comlev1_stream_hybrid, key=ikey_1
#endif
streamice_vert_shear_uz (m) = streamice_taubx(i,j,bi,bj) /
& visc_streamice_full(i,j,m,bi,bj)
& * streamice_sigma_coord(m)
streamice_vert_shear_vz (m) = streamice_tauby(i,j,bi,bj) /
& visc_streamice_full(i,j,m,bi,bj)
& * streamice_sigma_coord(m)
second_inv =
& sqrt(exx**2+eyy**2+exx*eyy+exy**2+eps_glen_min**2+
& 0.25 * streamice_vert_shear_uz(m)**2 +
& 0.25 * streamice_vert_shear_vz(m)**2)
#ifdef STREAMICE_3D_GLEN_CONST
visc_streamice_full(i,j,m,bi,bj) =
& .5 * B_glen(i,j,m,bi,bj)**2 *
& second_inv**((1-n_glen)/n_glen)
#else
visc_streamice_full(i,j,m,bi,bj) =
& .5 * B_glen(i,j,bi,bj)**2 *
& second_inv**((1-n_glen)/n_glen)
#endif
visc_streamice (i,j,bi,bj) = visc_streamice (i,j,bi,bj) +
& H_streamice(i,j,bi,bj) * streamice_delsigma (m) *
& visc_streamice_full(i,j,m,bi,bj)
omega_temp (m) = omega_temp(m+1) +
& streamice_sigma_coord(m) * streamice_delsigma(m) /
& visc_streamice_full(i,j,m,bi,bj)
u_shear (m) = u_shear (m+1) +
& streamice_vert_shear_uz (m) * streamice_delsigma (m) *
& H_streamice(i,j,bi,bj)
v_shear (m) = v_shear (m+1) +
& streamice_vert_shear_vz (m) * streamice_delsigma (m) *
& H_streamice(i,j,bi,bj)
ENDDO
mean_u_shear = 0.0
mean_v_shear = 0.0
DO m=Nr,1,-1
streamice_omega(i,j,bi,bj) = streamice_omega(i,j,bi,bj) +
& streamice_delsigma(m)*(omega_temp(m)+omega_temp(m+1))*.5
& * H_streamice(i,j,bi,bj)**2
mean_u_shear = mean_u_shear +
& streamice_delsigma(m)*(u_shear(m)+u_shear(m+1))*.5
mean_v_shear = mean_v_shear +
& streamice_delsigma(m)*(v_shear(m)+v_shear(m+1))*.5
ENDDO
streamice_u_surf(i,j,bi,bj) =
& u_shear(1) + umid - mean_u_shear
streamice_v_surf(i,j,bi,bj) =
& v_shear(1) + vmid - mean_v_shear
ub = umid - streamice_taubx(i,j,bi,bj) *
& streamice_omega(i,j,bi,bj) / H_streamice(i,j,bi,bj)
streamice_u_bed (i,j,bi,bj) = ub
vb = vmid - streamice_tauby(i,j,bi,bj) *
& streamice_omega(i,j,bi,bj) / H_streamice(i,j,bi,bj)
streamice_v_bed (i,j,bi,bj) = vb
unorm = sqrt(ub**2+vb**2+eps_u_min**2)
fb = C_basal_friction(i,j,bi,bj)**2 *
& STREAMICE_BSTRESS_EXP (unorm,n_basal_friction) *
& streamice_basal_geom(i,j,bi,bj) *
& float_frac_streamice(i,j,bi,bj)
tau_beta_eff_streamice(i,j,bi,bj) =
& fb /
& (1+fb*streamice_omega(i,j,bi,bj)/H_streamice(i,j,bi,bj))
ENDIF
ENDDO
ENDDO
ENDDO
ENDDO
#endif
#endif
RETURN
END