1. General Model Information

Name: Module for the calculation of potential transpiration and evaporation

Acronym: ETPOT1_0


Main medium: air+terrestrial
Main subject: hydrology
Organization level: ecosystem
Type of model: ordinary differential equations
Main application:
Keywords: Et, evapotranspiration, transpiration, Penman

Contact:

Dr.ir. B.A.M. Bouman
Research Institute for Agrobiology and Soil Fertility (AB-DLO)
Dept. Agrosystems Research
P.O.Box 14
6700 AA Wageningen
THE NETHERLANDS
Phone: +31.8370.75972
Fax : +31.8370.23110
email: bouman@ab.agro.nl
Bouman, B.A.M.

Author(s):

Bouman, B.A.M.

Abstract:

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

II.1 Executables:

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,=.

II.2 Source-code:

Programming Language(s): FORTRAN-77 (in FSE)

II.3 Manuals:



II.4 Data:



III. Mathematical Information


III.1 Mathematics


III.2 Quantities

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

III.2.1 Input

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

III.2.2 Output

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.


IV. References

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

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