w_etp | R Documentation |
ETP calculation
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
)
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 |
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.
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
P. Chevallier - April 2020-Nov2022
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.
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