Module PET (after Hargreaves, Table)
Estimation of daily potential evapotranspiration from daily average, minimum and maximum temperatures using Hargreave's empirical equation. In order to estimate extraterrestrial net radiation geographic latitude of observation and Julian day have to be supplied too.
References:
- Ambikadevi, K.M. (2004): Simulation of Evapotranspiration and Rainfall-runoff for the Stillwater River Watershed in Central Massachusetts. Environmental & Water Resources Engineering Masters Projects, University of Massachusetts, Amherst online
- Hargraeves, G.H., Samani, Z.A. (1985): Reference crop evapotranspiration from ambient air temperatures. Paper presented in ASAE Regional Meeting, Grand Junction, Colorado. online
FAO Irrigation and drainage paper 56. online
- Author: O.Conrad (c) 2011
- Specification: grid
- Menu: Climate|Evapotranspiration
Parameters
Name | Type | Identifier | Description | Constraints | |
---|---|---|---|---|---|
Input | Data | Table (input) | TABLE | - | - |
Options | Julian Day | Table field | JD | - | - |
Mean Temperature | Table field | T | - | - | |
Minimum Temperature | Table field | T_MIN | - | - | |
Maximum Temperature | Table field | T_MAX | - | - | |
Latitude | Floating point | LAT | - | Minimum: -90.000000 Maximum: 90.000000 Default: 53.000000 |
Command-line
Usage: saga_cmd climate_tools 6 [-TABLE <str>] [-JD <str>] [-T <str>] [-T_MIN <str>] [-T_MAX <str>] [-LAT <double>] -TABLE:<str> Data Table (input) -JD:<str> Julian Day Table field -T:<str> Mean Temperature Table field -T_MIN:<str> Minimum Temperature Table field -T_MAX:<str> Maximum Temperature Table field -LAT:<double> Latitude Floating point Minimum: -90.000000 Maximum: 90.000000 Default: 53.000000