1. General Model Information
Name: Module for the calculation of potential transpiration and evaporation
Main medium: air+terrestrial
Main subject: hydrology
Organization level: ecosystem
Type of model: ordinary differential equations
Keywords: Et, evapotranspiration, transpiration, Penman
Dr.ir. B.A.M. Bouman
Research Institute for Agrobiology and Soil Fertility (AB-DLO)
Dept. Agrosystems Research
6700 AA Wageningen
Fax : +31.8370.23110
Calculation of Penman reference value for potential evapotranspiration of a
reference crop and open water (mostly from formulation as given in Van Laar
et al., 1992). Calculation of potential transpiration of a true crop (with a
soil or a water layer background).
Author of the abstract:
CAMASE Register of Agro-ecosystems Models
II. Technical Information
Operating System(s): VAX computer, IBM compatible PC/AT >= 640 Kb RAM Other software required: the FORTRAN utility library TTUTIL. A user contract is mandatory, in principle this software product may be used only fornon-commercial purposes. The product is accompanied by an AB-DLO/TPE-WAU Licenceagreement and warranty disclaimer. Costs: Dfl. 270,=.
Programming Language(s): FORTRAN-77 (in FSE)
III. Mathematical Information
Rate variables: Radiation, wind speed, potential (evapo-)transpiration.
State variables: Relative soil water content in first soil layer, volumetric water content atsaturation in first soil layer, total area index (leaves and stems), daily average temperature, dailyactual vapour pressure.
Relative soil water content in first layer, volumetric water content at saturation in first
Relative soil water content in first layer, volumetric water content at saturation in firstsoil layer, total area index (leaves and stems), daily average temperature, solar radiation,extraterrestrial radiation, actual vapour pressure, average wind speed. Potential (evapo-)transpiration (due to radiation) of a crop with a water layer, with
Potential (evapo-)transpiration (due to radiation) of a crop with a water layer, witha soil background, of open water layer, potential evaporation of water layer below a crop, potentialtranspiration of soil below crop, potential evapotranspiration due to drying power of the air;reference crop or open water layer.
Time interval of simulation: 1 day.
Basic spatial unit: 1 m2.
Laar, H.H. van, J. Goudriaan & H. van Keulen (editors), 1992.
Simulation of crop growth for potential and water-limited production situations, as applied to spring wheat. Simulation Reports 27, 72 pp.
Bouman, B.A.M., 1993.
Rice growth model for irrigated and water-limited conditions.
SARP report, March 1993. AB-DLO. 67 pp.
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: T. Gabele: 17. 09. 1997 -
Status of the document:
last modified by
Joachim Benz Mon Jul 2 18:31:37 CEST 2007