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Fix to bottom drag as a body force #176

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Merged
marshallward merged 2 commits into from
Aug 2, 2022
Merged

Fix to bottom drag as a body force #176

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1f878a9
Bugfix to bottom drag as a body force
awallcraft Jul 29, 2022
6e324b3
Merge branch 'dev/gfdl' into drag
marshallward Aug 2, 2022
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8 changes: 6 additions & 2 deletions src/parameterizations/vertical/MOM_set_viscosity.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -741,6 +741,9 @@ subroutine set_viscous_BBL(u, v, h, tv, visc, G, GV, US, CS, pbv)
! bbl_thick.
if ((bbl_thick > 0.5*CS%Hbbl) .and. (CS%RiNo_mix)) bbl_thick = 0.5*CS%Hbbl

! If drag is a body force, bbl_thick is HBBL
if (CS%body_force_drag) bbl_thick = h_bbl_drag(i)

if (CS%Channel_drag) then
! The drag within the bottommost bbl_thick is applied as a part of
! an enhanced bottom viscosity, while above this the drag is applied
Expand Down Expand Up @@ -1022,7 +1025,7 @@ subroutine set_viscous_BBL(u, v, h, tv, visc, G, GV, US, CS, pbv)
visc%Ray_v(i,J,k) = visc%Ray_v(i,J,k) + (CS%cdrag*US%L_to_Z*umag_avg(i)) * h_bbl_fr
endif
h_sum = h_sum + h_at_vel(i,k)
if (h_sum >= bbl_thick) exit ! The top of this layer is above the drag zone.
if (h_sum >= h_bbl_drag(i)) exit ! The top of this layer is above the drag zone.
enddo
! Do not enhance the near-bottom viscosity in this case.
Kv_bbl = CS%Kv_BBL_min
Expand Down Expand Up @@ -2003,7 +2006,8 @@ subroutine set_visc_init(Time, G, GV, US, param_file, diag, visc, CS, restart_CS
call get_param(param_file, mdl, "DRAG_AS_BODY_FORCE", CS%body_force_drag, &
"If true, the bottom stress is imposed as an explicit body force "//&
"applied over a fixed distance from the bottom, rather than as an "//&
"implicit calculation based on an enhanced near-bottom viscosity", &
"implicit calculation based on an enhanced near-bottom viscosity. "//&
"The thickness of the bottom boundary layer is HBBL.", &
default=.false., do_not_log=.not.CS%bottomdraglaw)
call get_param(param_file, mdl, "CHANNEL_DRAG", CS%Channel_drag, &
"If true, the bottom drag is exerted directly on each "//&
Expand Down