1. General Model Information

Name: CATCHCROP

Acronym: CATCHCROP


Main medium: terrestrial
Main subject: agriculture
Organization level: Ecosystem
Type of model: difference equations (1D)
Main application: decision support/expert system
Keywords: crop modeling, integrated catchment assessment, thailand

Contact:

Dr Pascal Perez
RMAP Project
RSPAS
Australian National University
Acton - Canberra - ACT - 2605 - Australia
Phone: 61 - 2 - 61 25 87 05
Fax: 61 - 2 - 61 25 48 96
email: pascal@coombs.anu.edu.au
Homepage: http://rspas.anu.edu.au/rmap/Pages/Personnel/Perez.html

Author(s):

Perez P., Ardlie N., Kuneepong P., Dietrich C., Merritt W.S.

Abstract:

The Integrated Water Resource Assessment and Management (IWRAM) project uses a multi-disciplinary methodology that identifies and integrates biophysical, economic and socio-cultural disciplines into a Decision Support System (Scoccimarro et al., 1999). The DSS aims at providing guidelines in terms of water management. The user can explore the intended and unintended consequences of agricultural subsidies, land-use regulation and infrastructure construction in small catchments of Northern Thailand. The aim here is to construct a conceptual model that allows the dynamic simulation of crop yield, whilst still limiting data requirements and retaining some physical meaning. This avoids the type of problem cited by Kuneepong et al. (1990), for exemple, who noted the major problem in the use of WOFOST in Thailand was that the data needed to run the model were very specific and could be collected from experimental sites, but were generally not collected during extensive surveys. CATCHCROP has been created according to the overall objectives and associated modelling constraints specific to the IWRAM Decision Support System. Input data requirements, time step limitation and general portability have influenced the actual selection of the conceptual algorithm. First, the choice of the relevant time step is crucial and is limited by the potentially huge amount of runs to be performed by node in the catchment. According to previous studies, a 10 day-time step represents a fairly good compromise for a conceptual crop. CATCHCROP includes eight successive sub-routines: Step 1: Calculating runoff losses Step2: Soil evaporation correction Step 3: Calculating soil water storage Step 4: Calculating maxi. evapotranspiration Step 5: Soil fertility correction Step 6: Calculating actual evapotranspiration Step 7: Calculating water demand Step 8: Calculating the adjusted yield


II. Technical Information

II.1 Executables:

Operating System(s): PC compatible - Windows 95 & 98

II.2 Source-code:

Programming Language(s): Java

II.3 Manuals:



II.4 Data:

input files: daily rainfall, daily PET Default files: soil characteristics, crop parameters Keyboard prompt: Year, soil type, crop type (2 successive ones), level of fertilization, irrigation.

III. Mathematical Information


III.1 Mathematics

see: P. Perez, N. Ardlie , P. Kuneepong , C. Dietrich and W.S. Merritt, 2001: CATCHCROP: modeling crop yield and water demand for integrated catchment assessment in Northern Thailand. Environmental Modelling and Software, Vol. 17 (3) (2002) pp. 251-259, Elsevier Science Ltd. PII: S1364-8152(01)00074-3

III.2 Quantities

10-days rainfall (mm), 10-days PET (mm), 10-days Runoff (mm), 10-days Percolation(mm), 10-days AET (mm), 10-days Soil water Storage (mm), crop yield (kg/ha)

III.2.1 Input

input files: daily rainfall, daily PET Default files: soil characteristics, crop parameters Keyboard prompt: Year, soil type, crop type (2 successive ones), level of fertilization, irrigation.

III.2.2 Output

10-days results file including the main state variables for the two successive crops, crop yields.

IV. References

P. Perez, N. Ardlie , P. Kuneepong , C. Dietrich and W.S. Merritt, 2001: CATCHCROP: modeling crop yield and water demand for integrated catchment assessment in Northern Thailand. Environmental Modelling and Software, Vol. 17 (3) (2002) pp. 251-259, Elsevier Science Ltd. PII: S1364-8152(01)00074-3


V. Further information in the World-Wide-Web


VI. Additional remarks

CATCHCROP exists as a stand alone version but it was designed to fit in a larger DSS (IWRAM).
Last review of this document by: Mon May 27 03:28:17 2002
Status of the document: Contributed by Dr Pascal Perez
last modified by Tobias Gabele Wed Aug 21 21:44:40 CEST 2002

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