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NAME - Computes evapotranspiration calculation Priestley and Taylor formulation, 1972.


imagery, evapotranspiration

SYNOPSIS --help [-z] net_radiation=name soil_heatflux=name air_temperature=name atmospheric_pressure=name priestley_taylor_coeff=float output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]


Set negative ETa to zero
Allow output files to overwrite existing files
Print usage summary
Verbose module output
Quiet module output
Force launching GUI dialog


net_radiation=name [required]
Name of input net radiation raster map [W/m2]
soil_heatflux=name [required]
Name of input soil heat flux raster map [W/m2]
air_temperature=name [required]
Name of input air temperature raster map [K]
atmospheric_pressure=name [required]
Name of input atmospheric pressure raster map [millibars]
priestley_taylor_coeff=float [required]
Priestley-Taylor coefficient
Default: 1.26
output=name [required]
Name of output evapotranspiration raster map [mm/d]

Table of contents

DESCRIPTION Calculates the diurnal evapotranspiration after Prestley and Taylor (1972). The Priestley-Taylor model (Priestley and Taylor, 1972) is a modification of Penman's more theoretical equation.


RNETD optional output from i.evapo.potrad is giving good results as input for net radiation in this module.

Alpha values:

Alpha values extracted from: Watflood manual.

SEE ALSO,, i.evapo.time, i.eb.netrad, r.sun


Yann Chemin, GRASS Development Team, 2007-08


Available at: source code (history)

Latest change: Monday Feb 27 13:45:25 2023 in commit: a82501dc85294207e8e58437c3ec7f1056465ed4

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