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dgoldberg |
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C $Header: /u/gcmpack/MITgcm_contrib/dgoldberg/streamice/streamice_visc_beta.F,v 1.3 2012/09/04 21:11:44 dgoldberg Exp $ |
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C $Name: $ |
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#include "STREAMICE_OPTIONS.h" |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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CBOP |
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SUBROUTINE STREAMICE_VISC_BETA_HYBRID ( myThid ) |
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C /============================================================\ |
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C | SUBROUTINE | |
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C | o | |
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C |============================================================| |
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C | | |
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C \============================================================/ |
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IMPLICIT NONE |
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C === Global variables === |
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#include "SIZE.h" |
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#include "GRID.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "STREAMICE.h" |
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#include "STREAMICE_CG.h" |
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C !INPUT/OUTPUT ARGUMENTS |
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INTEGER myThid |
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! _RL taudx (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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! _RL taudx (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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#ifdef ALLOW_STREAMICE |
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#ifdef STREAMICE_HYBRID_STRESS |
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C LOCAL VARIABLES |
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INTEGER i, j, bi, bj, k, l, umid, vmid, m |
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_RL ux, uy, vx, vy, exx, eyy, exy, unorm, second_inv |
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_RL ub, vb, fb, mean_u_shear, mean_v_shear |
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_RL omega_temp (Nr+1), u_shear(Nr+1), v_shear(Nr+1) |
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_RL STREAMICE_BSTRESS_EXPONENT |
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! _RL total_vol_out |
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external STREAMICE_BSTRESS_EXPONENT |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO j=1,sNy |
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DO i=1,sNx |
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IF (STREAMICE_hmask(i,j,bi,bj).eq.1) THEN |
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umid = 0 |
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vmid = 0 |
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DO k=0,1 |
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DO l=0,1 |
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umid = umid + 0.25 * |
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& dxG(i,j+l,bi,bj)*dyG(i+k,j,bi,bj) * |
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& recip_rA(i,j,bi,bj) * |
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& U_streamice(i+k,j+l,bi,bj) |
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vmid = vmid + 0.25 * |
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& dxG(i,j+l,bi,bj)*dyG(i+k,j,bi,bj) * |
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& recip_rA(i,j,bi,bj) * |
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& V_streamice(i+k,j+l,bi,bj) |
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ENDDO |
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ENDDO |
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ux = (U_streamice(i+1,j+1,bi,bj) + |
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& U_streamice(i+1,j,bi,bj) - |
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& U_streamice(i,j+1,bi,bj) - |
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& U_streamice(i,j,bi,bj)) / |
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& (2. * dxF(i,j,bi,bj)) |
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vx = (V_streamice(i+1,j+1,bi,bj) + |
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& V_streamice(i+1,j,bi,bj) - |
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& V_streamice(i,j+1,bi,bj) - |
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& V_streamice(i,j,bi,bj)) / |
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& (2. * dxF(i,j,bi,bj)) |
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uy = (U_streamice(i+1,j+1,bi,bj) - |
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& U_streamice(i+1,j,bi,bj) + |
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& U_streamice(i,j+1,bi,bj) - |
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& U_streamice(i,j,bi,bj)) / |
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& (2. * dyF(i,j,bi,bj)) |
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vy = (V_streamice(i+1,j+1,bi,bj) - |
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& V_streamice(i+1,j,bi,bj) + |
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& V_streamice(i,j+1,bi,bj) - |
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& V_streamice(i,j,bi,bj)) / |
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& (2. * dyF(i,j,bi,bj)) |
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exx = ux + k1AtC_str(i,j,bi,bj)*vmid |
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eyy = vy + k2AtC_str(i,j,bi,bj)*umid |
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exy = .5*(uy+vx) + |
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& k1AtC_str(i,j,bi,bj)*umid + k2AtC_str(i,j,bi,bj)*vmid |
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visc_streamice (i,j,bi,bj) = 0.0 |
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streamice_omega(i,j,bi,bj) = 0.0 |
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omega_temp (Nr+1) = 0.0 |
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u_shear(Nr+1) = 0.0 |
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v_shear(Nr+1) = 0.0 |
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DO m=Nr,1,-1 |
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streamice_vert_shear_uz (m) = streamice_taubx(i,j,bi,bj) / |
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& visc_streamice_full(i,j,m,bi,bj) |
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& * streamice_sigma_coord(m) |
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streamice_vert_shear_vz (m) = streamice_tauby(i,j,bi,bj) / |
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& visc_streamice_full(i,j,m,bi,bj) |
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& * streamice_sigma_coord(m) |
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second_inv = |
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& sqrt(exx**2+eyy**2+exx*eyy+exy**2+eps_glen_min**2+ |
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& streamice_vert_shear_uz(m)**2 + |
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& streamice_vert_shear_vz(m)**2) |
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visc_streamice_full(i,j,m,bi,bj) = |
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& .5 * A_glen(i,j,bi,bj)**(-1./n_glen) * |
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& second_inv**((1-n_glen)/n_glen) |
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visc_streamice (i,j,bi,bj) = visc_streamice (i,j,bi,bj) + |
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& H_streamice(i,j,bi,bj) * streamice_delsigma (m) * |
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& visc_streamice_full(i,j,m,bi,bj) |
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omega_temp (m) = omega_temp(m+1) + |
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& streamice_sigma_coord(m) * streamice_delsigma(m) / |
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& visc_streamice_full(i,j,m,bi,bj) |
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u_shear (m) = u_shear (m+1) + |
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& streamice_vert_shear_uz (m) * streamice_delsigma (m) * |
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& H_streamice(i,j,bi,bj) |
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v_shear (m) = v_shear (m+1) + |
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& streamice_vert_shear_vz (m) * streamice_delsigma (m) * |
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& H_streamice(i,j,bi,bj) |
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ENDDO |
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mean_u_shear = 0.0 |
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mean_v_shear = 0.0 |
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DO m=Nr,1,-1 |
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streamice_omega(i,j,bi,bj) = streamice_omega(i,j,bi,bj) + |
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& streamice_delsigma(m)*(omega_temp(m)+omega_temp(m+1))*.5 |
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& * H_streamice(i,j,bi,bj)**2 |
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mean_u_shear = mean_u_shear + |
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& streamice_delsigma(m)*(u_shear(m)+u_shear(m+1))*.5 |
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mean_v_shear = mean_v_shear + |
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& streamice_delsigma(m)*(v_shear(m)+v_shear(m+1))*.5 |
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ENDDO |
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streamice_u_surf(i,j,bi,bj) = |
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& u_shear(1) + umid - mean_u_shear |
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streamice_v_surf(i,j,bi,bj) = |
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& v_shear(1) + vmid - mean_v_shear |
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ub = umid - streamice_taubx(i,j,bi,bj) * |
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& streamice_omega(i,j,bi,bj) / H_streamice(i,j,bi,bj) |
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vb = vmid - streamice_tauby(i,j,bi,bj) * |
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& streamice_omega(i,j,bi,bj) / H_streamice(i,j,bi,bj) |
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unorm = sqrt(ub**2+vb**2+eps_glen_min**2) |
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fb = C_basal_friction(i,j,bi,bj)**2 * |
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& STREAMICE_BSTRESS_EXPONENT (unorm,n_basal_friction) * |
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& streamice_basal_geom(i,j,bi,bj) |
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tau_beta_eff_streamice(i,j,bi,bj) = |
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& fb / |
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& (1+fb*streamice_omega(i,j,bi,bj)/H_streamice(i,j,bi,bj)) |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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#endif |
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#endif |
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RETURN |
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END |
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