Suitability of Dynamic Modeling for Flood Forecasting during Ice Jam Release Surge Events
Publication: Journal of Cold Regions Engineering
Volume 17, Issue 1
Abstract
Ice jam release surges present a unique challenge to the flood forecaster, since the surge released when an ice jam fails is highly dynamic in nature and, therefore, traditional hydrologic flood routing techniques are inapplicable. The problem is analogous to the classic dam break scenario and should be amenable to analysis by hydraulic flood routing techniques. However, previous investigations suggest that the influence of ice on the wave propagation and attenuation must also be considered to achieve accurate results. This study explores the applicability of dynamic hydraulic flow modeling techniques to the ice jam surge propagation problem, presenting the results of numerical simulations of the ice jam release event which occurred on the Saint John River upstream of Grand Falls, N.B., in April 1993. The surge propagation analysis was conducted using a one-dimensional finite element implementation of the Saint Venant equations adapted for natural channel geometries. Even neglecting ice effects, the resulting model is successful in terms of reproducing the observed peak stage and the surge propagation speed. Based on these results, it is concluded that accurate channel geometry is a key factor in effectively modeling ice jam release surge events.
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References
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Information
Published In
Journal of Cold Regions Engineering
Volume 17 • Issue 1 • March 2003
Pages: 18 - 36
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Jun 4, 2001
Accepted: Jul 22, 2002
Published online: Feb 14, 2003
Published in print: Mar 2003
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