diff --git a/DESCRIPTION b/DESCRIPTION
index ca35bec4c2ad471bdf18db50b37d20d89a9de1f4..50051874d2d3f569095d27768451e1bc75b84bb6 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
Package: airGR
Type: Package
Title: Suite of GR Hydrological Models for Precipitation-Runoff Modelling
-Version: 1.6.3.68
+Version: 1.6.3.69
Date: 2020-11-23
Authors@R: c(
person("Laurent", "Coron", role = c("aut", "trl"), comment = c(ORCID = "0000-0002-1503-6204")),
diff --git a/NEWS.md b/NEWS.md
index bc9380ed5c47fa4015bc044149168d8b4f441168..e53fabac733471ca8529d881f3af6e1dac871fe5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -4,7 +4,7 @@
-### 1.6.3.68 Release Notes (2020-11-23)
+### 1.6.3.69 Release Notes (2020-11-23)
#### New features
diff --git a/src/frun_ETP.f90 b/src/frun_ETP.f90
index c0c6f20ddf9dd5936066c43ab5b9ef34ae9e09d0..9d064c3bc20eb00697f150d12aa9eaa7e539318f 100644
--- a/src/frun_ETP.f90
+++ b/src/frun_ETP.f90
@@ -1,6 +1,45 @@
+!------------------------------------------------------------------------------
+! Subroutines relative to the Oudin potential evapotranspiration (PE) formula
+!------------------------------------------------------------------------------
+! TITLE : airGR
+! PROJECT : airGR
+! FILE : frun_ETP.f90
+!------------------------------------------------------------------------------
+! AUTHORS
+! Original code: L. Oudin
+! Cleaning and formatting for airGR: Fr. Bourgin
+! Further cleaning: O. Delaigue, G. Thirel
+!------------------------------------------------------------------------------
+! Creation date: 2004
+! Last modified: 20/10/2020
+!------------------------------------------------------------------------------
+! REFERENCES
+! Oudin, L., Hervieu, F., Michel, C., Perrin, C., Andréassian, V.,
+! Anctil, F. and Loumagne, C., 2005. Which potential evapotranspiration
+! input for a rainfall-runoff model? Part 2 - Towards a simple and
+! efficient PE model for rainfall-runoff modelling. Journal of Hydrology
+! 303(1-4), 290-306.
+!------------------------------------------------------------------------------
+! Quick description of public procedures:
+! 1. frun_etp_oudin
+! 2. PE_OUDIN
+!------------------------------------------------------------------------------
+
+
!*******************************************************************************
- SUBROUTINE frun_etp_oudin(LInputs,InputsLAT,InputsTT,InputsJJ,OutputsETP)
+ SUBROUTINE frun_etp_oudin(LInputs,InputsLAT,InputsTemp,InputsJJ,OutputsPE)
!*******************************************************************************
+! Subroutine that performs the call to the PE_OUDIN subroutine at each time step,
+! and stores the final values
+! Inputs
+! LInputs ! Integer, length of input and output series
+! InputsLAT ! Vector of real, input series of latitude [rad]
+! InputsTemp ! Vector of real, input series of air mean temperature [degC]
+! InputsJJ ! Vector of real, input series of Julian day [-]
+! Outputs
+! OutputsPE ! Vector of real, output series of potential evapotranspiration (PE) [mm/time step]
+
+
!DEC$ ATTRIBUTES DLLEXPORT :: frun_etp_oudin
@@ -10,27 +49,27 @@
! in
integer, intent(in) :: LInputs
doubleprecision, dimension(LInputs), intent(in) :: InputsLAT
- doubleprecision, dimension(LInputs), intent(in) :: InputsTT
+ doubleprecision, dimension(LInputs), intent(in) :: InputsTemp
doubleprecision, dimension(LInputs), intent(in) :: InputsJJ
! out
- doubleprecision, dimension(LInputs), intent(out) :: OutputsETP
+ doubleprecision, dimension(LInputs), intent(out) :: OutputsPE
!! locals
- integer :: k
- real :: FI, tt, jj, ETPoud
+ integer :: k
+ doubleprecision :: FI, tt, jj, PEoud
!--------------------------------------------------------------
! Time loop
!--------------------------------------------------------------
- DO k=1,LInputs
- tt = InputsTT(k)
+ DO k = 1, LInputs
+ tt = InputsTemp(k)
jj = InputsJJ(k)
- FI = InputsLAT(k) / 57.296
+ FI = InputsLAT(k)!
!model run on one time step
- CALL ETP_OUDIN(FI,tt,jj,ETPoud)
+ CALL PE_OUDIN(FI, tt, jj, PEoud)
!storage of outputs
- OutputsETP(k) = ETPoud
+ OutputsPE(k) = PEoud
ENDDO
RETURN
@@ -38,14 +77,22 @@
ENDSUBROUTINE
+
+
+
+!################################################################################################################################
+
+
+
+
!*******************************************************************************
- SUBROUTINE ETP_OUDIN(FI,DT,JD,DPE)
+ SUBROUTINE PE_OUDIN(FI,DT,JD,DPE)
!*******************************************************************************
-! This subroutine calculates daily potential evapotranspiration (DPE)
-! using daily temperature and daily extra-atmospheric global radiation
+! Calculation of potential evapotranspiration (DPE) on a single time step
+! using air temperature and daily extra-atmospheric global radiation
! (that depends only on Julian day)
!
-! The PE formula is is that described in:
+! The PE formula is described in:
! Oudin, L., Hervieu, F., Michel, C., Perrin, C., Andréassian, V.,
! Anctil, F. and Loumagne, C., 2005. Which potential evapotranspiration
! input for a rainfall-runoff model? Part 2 - Towards a simple and
@@ -58,67 +105,68 @@
! of hydrology. Journal of Hydrology 66 (1/4), 1-76.
!
!***************************************************************
-! Inputs:
-! xLAT: Latitude in decimal degrees
-! DT: Temperature in degree C
-! JD: Julian day
+! Inputs
+! FI ! Latitude [rad]
+! DT ! Air Temperature [degC]
+! JD ! Julian day [-]
!
-! Output:
-! DPE: Daily potential evapotranspiration in mm
+! Outputs
+! DPE ! Potential evapotranspiration [mm/time step]
!***************************************************************
IMPLICIT NONE
- REAL :: xLAT, FI, COSFI, TETA, COSTETA, COSGZ, GZ, COSGZ2
- REAL :: SINGZ, COSOM, COSOM2, SINOM, COSPZ, OM, GE
- REAL :: ETA, DPE, DT, JD, RD
-
-! DATA RD/57.296/
+ !! dummies
+ ! in
+ doubleprecision, intent(in) :: FI, DT, JD
+ ! out
+ doubleprecision, intent(out) :: DPE
+ !! locals
+ doubleprecision :: COSFI, TETA, COSTETA, COSGZ, GZ, COSGZ2
+ doubleprecision :: SINGZ, COSOM, COSOM2, SINOM, COSPZ, OM, GE
+ doubleprecision :: ETA
! Calculation of extra-atmospheric global radiation (Appendix C in Morton
! (1983), Eq. C-6 to C-11, p.60-61)
-! Converts latitude in radians
-! FI=xLAT/RD
COSFI=COS(FI)
-! AFI=ABS(xLAT/42.)
! TETA: Declination of the sun in radians
TETA=0.4093*SIN(JD/58.1-1.405)
COSTETA=COS(TETA)
- COSGZ=MAX(0.001,COS(FI-TETA))
+ COSGZ=MAX(0.001d0,COS(FI-TETA))
! GZ: Noon angular zenith distance of the sun
GZ=ACOS(COSGZ)
COSGZ2=COSGZ*COSGZ
- IF(COSGZ2.GE.1.)THEN
- SINGZ=0.
+ IF(COSGZ2.GE.1.) THEN
+ SINGZ=0.
ELSE
- SINGZ=SQRT(1.-COSGZ2)
+ SINGZ=SQRT(1.-COSGZ2)
ENDIF
COSOM=1.-COSGZ/COSFI/COSTETA
- IF(COSOM.LT.-1.)COSOM=-1.
- IF(COSOM.GT.1.)COSOM=1.
+ IF(COSOM.LT.-1.) COSOM=-1.
+ IF(COSOM.GT.1.) COSOM=1.
COSOM2=COSOM*COSOM
- IF(COSOM2.GE.1.)THEN
- SINOM=0.
+ IF(COSOM2.GE.1.) THEN
+ SINOM=0.
ELSE
- SINOM=SQRT(1.-COSOM2)
+ SINOM=SQRT(1.-COSOM2)
ENDIF
OM=ACOS(COSOM)
! PZ: Average angular zenith distance of the sun
COSPZ=COSGZ+COSFI*COSTETA*(SINOM/OM-1.)
- IF(COSPZ.LT.0.001)COSPZ=0.001
+ IF(COSPZ.LT.0.001) COSPZ=0.001
! ETA: Radius vector of the sun
ETA=1.+COS(JD/58.1)/30.
! GE: extra-atmospheric global radiation
GE=446.*OM*COSPZ*ETA
! Daily PE by Oudin et al. (2006) formula:
- DPE=MAX(0.,GE*(DT+5.)/100./28.5)
+ DPE=MAX(0.d0,GE*(DT+5.)/100./28.5)
RETURN
- END SUBROUTINE ETP_OUDIN
+ END SUBROUTINE PE_OUDIN
!*******************************************************************************