Process-based model predictions of hurricane induced morphodynamic change on low-lying barrier islands

By: , and 
Edited by: Ping WangJulie D. Rosati, and Tiffany M. Roberts

Links

Abstract

Using Delft3D, a Chandeleur Island model was constructed to examine the sediment-transport patterns and morphodynamic change caused by Hurricane Katrina and similar storm events. The model setup included a coarse Gulf of Mexico domain and a nested finer-resolution Chandeleur Island domain. The finer-resolution domain resolved morphodynamic processes driven by storms and tides. A sensitivity analysis of the simulated morphodynamic response was performed to investigate the effects of variations in surge levels. The Chandeleur morphodynamic model reproduced several important features that matched observed morphodynamic changes. A simulation of bathymetric change driven by storm surge alone (no waves) along the central portion of the Chandeleur Islands showed (1) a general landward retreat and lowering of the island chain and (2) multiple breaches that increased the degree of island dissection. The locations of many of the breaches correspond with the low-lying or narrow sections of the initial bathymetry. The major part of the morphological change occurred prior to the peak of the surge when overtopping of the islands produced a strong water-level gradient and induced significant flow velocities.

Additional publication details

Publication type Conference Paper
Title Process-based model predictions of hurricane induced morphodynamic change on low-lying barrier islands
DOI 10.1142/9789814355537_0098
Year Published 2011
Language English
Publisher World Scientific
Contributing office(s) St. Petersburg Coastal and Marine Science Center
Description 5 p.
Larger Work Type Conference Paper
Larger Work Title Proceedings of the Coastal Sediments 2011
First page 1299
Last page 1303
Conference Title Coastal Sediments 2011
Conference Location Miami, Florida
Conference Date May 2-6 2011
Online Only (Y/N) N
Additional Online Files (Y/N) N