Calculates actual evapotranspiration by means of the SINGLE CROP COEFFICIENT procedure outlined in the FAO56 publication. See https://www.fao.org/3/x0490e/x0490e0b.htm for details. More...

Functions/Subroutines
subroutine	initialize_actual_et_fao56 ()
elemental real(c_float) function	adjust_depletion_fraction_p (p_table_22, reference_et0)
	Adjust the depletion fraction based on current reference ET0.
elemental subroutine	calculate_actual_et_fao56 (actual_et, adjusted_depletion_fraction_p, soil_storage, depletion_fraction_p, soil_storage_max, infiltration, crop_etc)

Variables
real(c_float), dimension(:), allocatable	depletion_fraction
real(c_float), parameter	near_zero = 3.0_c_float * tiny( 0.0_c_float )

Detailed Description

Calculates actual evapotranspiration by means of the SINGLE CROP COEFFICIENT procedure outlined in the FAO56 publication. See https://www.fao.org/3/x0490e/x0490e0b.htm for details.

Function/Subroutine Documentation

◆ adjust_depletion_fraction_p()

elemental real (c_float) function actual_et__fao56::adjust_depletion_fraction_p	(	real (c_float), intent(in)	p_table_22,
		real (c_double), intent(in)	reference_et0 )

Adjust the depletion fraction based on current reference ET0.

From FAO-56: "The fraction p is a function of the evaporation power of the atmosphere. At low rates of ETc, the p values listed in Table 22 are higher than at high rates of ETc. For hot dry weather conditions, where ETc is high, p is 10-25% less than the values presented in Table 22, and the soil is still relatively wet when the stress starts to occur. When the crop evapotranspiration is low, p will be up to 20% more than the listed values.

Parameters

[in]	p_table_22	This is the unadjusted depletion fraction value; FAO-56 table 22 gives values of the depletion fraction relative to a reference ET0 value of 5mm.
[in]	reference_et0	The reference ET0 to which the depletion fraction will be adjusted.

Note: Discussed as a footnote to Table 22, FAO-56, Allen and others. See http://www.fao.org/docrep/x0490e/x0490e0e.htm#TopOfPage for details.

Definition at line 42 of file actual_et__fao56.F90.

◆ calculate_actual_et_fao56()

elemental subroutine actual_et__fao56::calculate_actual_et_fao56	(	real (c_double), intent(inout)	actual_et,
		real (c_double), intent(inout)	adjusted_depletion_fraction_p,
		real (c_double), intent(in)	soil_storage,
		real (c_float), intent(in)	depletion_fraction_p,
		real (c_float), intent(in)	soil_storage_max,
		real (c_float), intent(in)	infiltration,
		real (c_float), intent(in)	crop_etc )

Definition at line 57 of file actual_et__fao56.F90.

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◆ initialize_actual_et_fao56()

subroutine actual_et__fao56::initialize_actual_et_fao56

Definition at line 21 of file actual_et__fao56.F90.

Variable Documentation

◆ depletion_fraction

real (c_float), dimension(:), allocatable actual_et__fao56::depletion_fraction

Definition at line 16 of file actual_et__fao56.F90.

◆ near_zero

real (c_float), parameter actual_et__fao56::near_zero = 3.0_c_float * tiny( 0.0_c_float )

Definition at line 17 of file actual_et__fao56.F90.

Functions/Subroutines

Variables