1. General Model Information

Name: Growth model to simulate crop growth, optical reflectance and radar

Acronym: WWFLEVO

Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: ordinary differential equations
Main application:
Keywords: crop growth, winter wheat, optical reflectance, radar backscatter, remote sensing


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
Phone: +31.8370.75972
Fax : +31.8370.23110
email: bouman@ab.agro.nl



The model simulates daily growth of a winter wheat crop on the basis of underlying physiological and physical processes (e.g. light interception, photosynthesis, respiration), and its optical reflectance and radar backscatter on the basis of physical interaction processes. The crop model part is SUCROS87 for potential crop growth (i.e. ample supply of water and nutrients, no pests, weeds and diseases). Rate of dry matter accumulation is a function of irradiation, temperature and crop characteristics. The optical reflectance model is EXTRAD: optical reflectance is simulated in the green, red and infrared bands from soil and crop optical properties, leaf area index, canopy architecture and illumination conditions. The vegetation indices NDVI, WDVI and IR/R-ratio are calculated. The radar backscatter model is CLOUD: radar backscatter (gamma) is simulated from the amount of water in the soil and in the canopy and from soil and canopy backscatter characteristics for several angles of incidence, VV and HH polarization and in Ku1, Ku2, X, C, S and L-bands. All submodels have been parameterized and validated on data collected during several remote sensing campaigns in (South-)Flevoland, The Netherlands, between 1980-1988 (ground based ROVE, Agriscatt).

Author of the abstract:

CAMASE (Concerted Action for the development and testing of quantitative methods for research on Agricultural Systems and the Environment).

II. Technical Information

II.1 Executables:

Operating System(s): VAX computer, IBM compatible PC/AT >= 640 Kb RAM

II.2 Source-code:

Programming Language(s): FORTRAN-77

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Bouman, B.A.M., 1992. SBFLEVO and WWFLEVO, Growth models to simulate crop growth, opticalreflectance and radar backscatter of sugar beet and winter wheat, calibrated for Flevoland.CABO-DLO report 163, 116 pp., CABO-DLO Wageningen, The Netherlands.

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele : Tue Oct 7 1997
Status of the document: last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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