Application of SWAT to model the water balance of the Woady Yaloak River catchment, Australia

Watson, Brett, Ghafouri, Mohammad and Selvalingam, Selvadore 2003, Application of SWAT to model the water balance of the Woady Yaloak River catchment, Australia, in SWAT 2003: 2nd International SWAT Conference, USDA-ARS Research Lab, Temple, Tex., pp. 94-110.

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Title Application of SWAT to model the water balance of the Woady Yaloak River catchment, Australia
Alternative title Predicting catchment water balance in Southern Australia using SWAT
Author(s) Watson, Brett
Ghafouri, Mohammad
Selvalingam, Selvadore
Conference name International SWAT Conference (2nd : 2003 : Bari, Italy)
Conference location Bari, Italy
Conference dates July 1-4 2003
Title of proceedings SWAT 2003: 2nd International SWAT Conference
Editor(s) Srinivasan, Raghavan
Jacobs, Jennifer
Jensen, Ric
Publication date 2003
Start page 94
End page 110
Total pages 303 p.
Publisher USDA-ARS Research Lab
Place of publication Temple, Tex.
Keyword(s) SWAT
water balance model
catchment hydrology
land use change
Summary The widespread land use changes that are expected to occur across the Corangamite region in southwest Victoria, Australia, have the potential to significantly alter the water balance of catchments. Adoption of the Soil and Water Assessment Tool (SWAT), which is a long-term water balance model, as a tool for predicting land use change impacts on catchment water balance for the Corangamite region is currently being considered. This paper describes the initial application of SWAT to the Woady Yaloak River catchment, located within the Corangamite region, to carry out an evaluation of its abilities for simulating the long-term water balance dynamics of the catchment. The performance of the model for predicting runoff at annual and monthly time scales was found to be very good. The excessive recharge of the shallow aquifer that occurred during winter, despite the subsoil being relatively impermeable, ultimately contributed to overestimation of baseflow and underestimation of interflow. The actual evapotranspiration from hydrologic response units (HRU s) containing eucalyptus trees was significantly less than that from HRUs containing pasture, a problem attributed to the incorrect simulation of Leaf Area Index (LAI) and biomass by the model for mature stands of eucalyptus trees and also to assigning inadequate values for two parameters that directly influence evapotranspiration. SWAT has very good potential for being used as tool to study land use change impacts across the Corangamite region provided that several modifications are made to the model to overcome some of the shortcomings and deficiencies that were identified in this initial application.
Notes This paper is located on the 94th page in the attached pdf.
Language eng
Field of Research 040608 Surfacewater Hydrology
HERDC Research category E2 Full written paper - non-refereed / Abstract reviewed
Copyright notice ©2003, USDA-ARS Research Lab
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