Studying Effects of Spatial Scale on Model Calibration Using Soil Water Assessment Tool (SWAT)
Publication: World Environmental and Water Resources Congress 2008: Ahupua'A
Abstract
Calibration of model parameters is a critical step in any successful watershed modeling project. The calibrated values of model parameters, however, are influenced by sub-watershed divisions and resolution of input data. The objective of this research is to study the effects of sub-watershed divisions and scale of soil data on calibration of SWAT model for the St. Joseph River Watershed (SJRW). Two sets of SJRW models one with SSURGO data (1:24,000 scale) and other with STATSGO data (1:250,000 scale), each set having six different level of sub-watershed division varying from 10 sub-watersheds to 97 sub-watersheds, are independently calibrated using SCA-UA algorithm for daily streamflow output at watershed outlet. Calibrated results show no significant difference in terms of model performance however good parameter sets showed varied range of sensitivity to model spatial scale. This result indicates towards redefining uncertainty range of sensitive model parameters.
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Copyright
© 2008 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Business management
- Calibration
- Decision making
- Decision support systems
- Engineering fundamentals
- Geomechanics
- Geotechnical engineering
- Hydrologic models
- Mathematics
- Measurement (by type)
- Models (by type)
- Parameters (statistics)
- Practice and Profession
- River engineering
- River systems
- Scale models
- Soil mechanics
- Soil properties
- Soil water
- Statistics
- Water and water resources
- Water management
- Water supply
- Water use
- Watersheds
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