i.evapo.pt1grass
Computes evapotranspiration calculation priestley and taylor formulation, 1972.
Usage
i.evapo.pt
i.evapo.pt --help
i.evapo.pt [-z]
net_radiation=name
soil_heatflux=name
air_temperature=name
atmospheric_pressure=name
priestley_taylor_coeff=float
output=name
[--overwrite]
[--help]
[--verbose]
[--quiet]
[--ui]
Keywords
imagery, evapotranspiration
Overview
i.evapo.pt 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.
Notes
RNETD optional output from i.evapo.potrad is giving good results as input for net radiation in this module.
Alpha values:
- •
-
1.32 for estimates from vegetated areas as a result of the increase in surface roughness (Morton, 1983; Brutsaert and Stricker, 1979)
- •
-
1.26 is applicable in humid climates (De Bruin and Keijman, 1979; Stewart and Rouse, 1976; Shuttleworth and Calder, 1979), and temperate hardwood swamps (Munro, 1979)
- •
-
1.74 has been recommended for estimating potential evapotranspiration in more arid regions (ASCE, 1990). This worked well in Greece with University of Thessaloniki.
Alpha values extracted from: Watflood manual.
Source code
Available at: i.evapo.pt source code (history)
Accessed: Monday Feb 24 17:51:33 2025
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© 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual
Releases
5 releases since Debian 9 (Stretch); the text changed 4 times.