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add surface water outflow parameter #2581

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7 changes: 5 additions & 2 deletions src/biogeophys/SurfaceWaterMod.F90
Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,7 @@ module SurfaceWaterMod
type, private :: params_type
real(r8) :: pc ! Threshold probability for surface water (unitless)
real(r8) :: mu ! Connectivity exponent for surface water (unitless)
real(r8) :: h2osfc_outflow_scalar ! H2osfc outflow scalar (unitless)
end type params_type
type(params_type), private :: params_inst

Expand Down Expand Up @@ -68,7 +69,9 @@ subroutine readParams( ncid )
call readNcdioScalar(ncid, 'pc', subname, params_inst%pc)
! Connectivity exponent for surface water (unitless)
call readNcdioScalar(ncid, 'mu', subname, params_inst%mu)

! H2osfc outflow scalar (unitless)
call readNcdioScalar(ncid, 'h2osfc_outflow_scalar', subname, params_inst%h2osfc_outflow_scalar)

end subroutine readParams

!-----------------------------------------------------------------------
Expand Down Expand Up @@ -486,7 +489,7 @@ subroutine QflxH2osfcSurf(bounds, num_hydrologyc, filter_hydrologyc, &
k_wet=1.0e-4_r8 * sin((rpi/180._r8) * topo_slope(c))
if (col%is_hillslope_column(c)) then
! require a minimum value to ensure non-zero outflow
k_wet = 1e-4_r8 * max(col%hill_slope(c),min_hill_slope)
k_wet = params_inst%h2osfc_outflow_scalar * max(col%hill_slope(c),min_hill_slope)
endif
qflx_h2osfc_surf(c) = k_wet * frac_infclust * (h2osfc(c) - h2osfc_thresh(c))

Expand Down
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