Process-based model predictions of hurricane induced morphodynamic change on low-lying barrier islands
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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.
| 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 |
| Google Analytic Metrics | Metrics page |