Dynamic Routing Model with Real-Time Roughness Updating for Flood Forecasting
Publication: Journal of Hydraulic Engineering
Volume 132, Issue 6
Abstract
A flood routing model with time-varying roughness updating was developed to simulate flows through natural channels based on the dynamic wave theory. Taking observed stages as the targets, a roughness updating technique was developed using the Gauss-Newton method to update the Manning in each time step of the routing processes. The technique provides a reasonable roughness coefficient estimate and reliable initialization of stage profile for the forecast. The examinations including the initialization of stage profile, conservation of mass, iteration convergence, effectiveness evaluation, and convergence with different initial values were conducted to verify the predictive capability of the roughness updating technique. The forecasting results show that the stage recalculated by updating the Manning in current time has a good agreement with the observed stage. The presented model can improve the forecast for a lead time up to in the Tanshui River of northern Taiwan.
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Acknowledgments
The authors express their grateful appreciation for the sponsorship of the National Science Council of Taiwan under Grant No. NSCTNSC-92-2625-Z-002-016. The measured data were provided by the Taiwan Water Resources Agency. The authors are also thankful to Dr. Albert Y. Kuo and three anonymous reviewers for their helpful reviews; through their comments and suggestions this paper was substantially improved.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 132 • Issue 6 • June 2006
Pages: 605 - 619
Copyright
© 2006 ASCE.
History
Received: Jun 15, 2004
Accepted: Jul 8, 2005
Published online: Jun 1, 2006
Published in print: Jun 2006
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