w_etp: Compute the potential evapotranspiration with several methods

In htsr: Hydro-Meteorology Time-Series

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
)

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

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.

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

Author(s)

P. Chevallier - April 2020-Nov2022

Source

Hingray, B., Picouet, C., Musy A., Hydrologie, une science pour l'ingénieur, Presses Plolytechniques et Universitaires Romandes, 2008,

Allen, R.G., L.S. Pereira, D. Raes, and M. Smith. 1998. Crop Evapotranspiration. Guidelines for Computing Crop Water Requirements. FAO Irrigation and Drainage Paper 56. 300p

Er-Raki, S., A. Chehbouni, S. Khabba, V. Simonneaux, L. Jarlan, A. Ouldbba, J. C. Rodriguez, and R. Allen. 2010. “Assessment of Reference Evapotranspiration Methods in Semi-Arid Regions: Can Weather Forecast Data Be Used as Alternate of Ground Meteorological Parameters?” Journal of Arid Environments 74 (12): 1587–96. https://doi.org/10.1016/j.jaridenv.2010.07.002.

htsr documentation built on Oct. 13, 2023, 5:10 p.m.