Monitoring the calibration of catchment modelling systems

World Scientific Publishing Co. Pte. Ltd
Publication Type:
Conference Proceeding
Proceedings of the 6th International Conference on Hydroinformatics, 2004, pp. 203 - 213
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The application of catchment modelling systems is now a common approach for management of catchments. Fundamental to the application of a catchment modelling system is the calibration and validation of the many control parameters used to ensure that the simulated catchment response adequately reproduces the actual catchment response. Recorded information about the actual catchment response is needed if this necessary calibration and validation process is to be undertaken. However, the recorded information typically used for operation of a catchment modelling system rarely, if ever, is error free. These errors have the potential to influence the calibration of the control parameters for a catchment modelling system. Traditional calibration approaches focus only on achieving the parameter values that result in the best curve-fitting between simulated and recorded data. Introduced herein is an Early Stopping Technique which is aimed at avoiding curve-fitting through monitoring improvements in the objective function used for determining the set of optimal control parameters. Application of this approach to the calibration of SWMM (Storm Water Management Model) on the Centennial Park catchment in Sydney is outlined.
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