Dynamic Modeling of Storm Surge and Inland Flooding in a Texas Coastal Floodplain
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 10
Abstract
The purpose of this study is to analyze the combined effects of storm surge and inland rainfall on the floodplain of a coastal bayou in the Houston area by using dynamic hydraulic modeling. Most existing floodplains in the Houston area are defined using only rainfall as an input into steady-state hydraulic models and do not consider the impact of hurricane-induced storm surge on the floodplain. HEC-RAS, a one-dimensional flow model, was run for both steady- and unsteady-states to analyze the additional effect storm surge has on the coastal floodplain. Storm surge and rainfall data from Hurricane Ike were utilized to run an unsteady hydraulic model on Horsepen Bayou near Galveston Bay. The dynamic model generated a good match between the modeled hydrograph and measured data in the watershed. Additionally, a timing sensitivity analysis was completed by shifting the timing of the storm surge both earlier and later in time. The dynamic model revealed that the timing of both rainfall and storm surge play a significant role in the magnitude of inland flooding.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 10 • October 2011
Pages: 1103 - 1110
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jul 13, 2010
Accepted: Feb 1, 2011
Published online: Sep 15, 2011
Published in print: Oct 1, 2011
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