w_etp: Compute the potential evapotranspiration with several methods

Description

ETP calculation

Usage

w_etp(
  method = c("Turc", "Penman-Monteith", "Priestley-Taylor", "Makkink",
    "Heargraves-Samani"),
  freq = c("day", "month"),
  f_temp,
  f_relh = NA,
  f_radg = NA,
  f_radn = NA,
  f_atmp = NA,
  f_wvel = NA,
  f_tmin = NA,
  f_tmax = NA,
  lat = NA,
  alt = NA,
  albedo = NA,
  z = NA
)

Value

An hts files resulting of the operation with a name composed as:

<J or M><EtpTu>_<Station_id>.hts for the Turc method,

<J or M><EtpPM>_<Station_id>.hts for the Penman-Monteith method,

<J or M><EtpPT>_<Station_id>.hts for the Priestley-Taylor method

<J or M><EtpMa>_<Station_id>.hts for the Makkink method

<J or M><EtpHS>_<Station_id>.hts for the Heargraves-Samani method

Arguments

method: Method "Turc", "Penman-Monteith", "Priestley-Taylor", "Makkink", "Heargraves-Samani"
freq: Frequency "day", "month"
f_temp: File of air temperature in degC, mandatory
f_relh: File of relative humidity in percent, mandatory
f_radg: File of global radiation in W/m2
f_radn: File of net radiation in W/m2
f_atmp: File of atmospheric pressure in hPa
f_wvel: File of wind velocities in m/s
f_tmin: File of air min temperature in degC
f_tmax: File of air max temperature in degC
lat: Latitude in deg
alt: Altitude in m
albedo: Albedo
z: Anemometer high in m

Author

P. Chevallier - April 2020-Nov2022

Details

f_temp and f_relh are mandatory in all cases.

For the Turc method, f_radg is needed.

For the Penman-Monteith method, f_atmp, f_wvel, h and z are needed. If f_radn is not avalaible, lat, f_tmin and ftmax are also needed.

The Turc method only works with a monthly frequence.