Coupled 1D–Quasi-2D Flood Inundation Model with Unstructured Grids
Publication: Journal of Hydraulic Engineering
Volume 136, Issue 8
Abstract
A simplified numerical model for simulation of floodplain inundation resulting from naturally occurring floods in rivers is presented. Flow through the river is computed by solving the de Saint Venant equations with a one-dimensional (1D) finite volume approach. Spread of excess flood water spilling overbank from the river onto the floodplains is computed using a storage cell model discretized into an unstructured triangular grid. Flow exchange between the one-dimensional river cells and the adjacent floodplain cells or that between adjoining floodplain cells is represented by diffusive-wave approximated equation. A common problem related to the stability of such coupled models is discussed and a solution by way of linearization offered. The accuracy of the computed flow depths by the proposed model is estimated with respect to those predicted by a two-dimensional (2D) finite volume model on hypothetical river-floodplain domains. Finally, the predicted extent of inundation for a flood event on a stretch of River Severn, United Kingdom, by the model is compared to those of two proven two-dimensional flow simulation models and with observed imagery of the flood extents.
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Acknowledgments
The second writer thankfully acknowledges the support of the Commonwealth Scholarship Commission in the United Kingdom for providing a fellowship that enabled him to spend some time at the University of Bristol, U.K., where part of this work was carried out.
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Received: Oct 21, 2008
Accepted: Feb 17, 2010
Published online: Feb 20, 2010
Published in print: Aug 2010
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