Characterisation and modelling of washover fans
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Abstract
Pre- and post-storm topography and aerial photography, collected in regions where new washover fans were formed, were studied to determine the extent of morphologic, vegetative and anthropogenic control on washover shape and extent. When overwash is funnelled through a gap in a dune ridge and then spreads laterally on the back barrier, decelerating and depositing sediment, it forms washover fans. Fans were shown to primarily occur at pre-existing gaps in the foredune. During overwash, these gaps, or overwash throats, widened and deepened. The shape and extent of the fan was shown to depend on not only the pre-storm topography, but also the existence of beach tracks, roads and other anthropogenic influences and vegetation. The cross-shore overwash profile change model by Larson et al. and Donnelly et al. was modified to include pre-storm throat widths and a lateral spreading angle estimated from the pre-storm topography as inputs and tested using cross-shore profiles through the fan centres. These new inputs make the model more generalised, such that the calibrated model is applicable to a wider range of cross-shore profiles.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Characterisation and modelling of washover fans |
| ISBN | 0784409269; 9780784409268 |
| DOI | 10.1061/40926(239)162 |
| Year Published | 2007 |
| Language | English |
| Publisher | American Society of Civil Engineers |
| Contributing office(s) | Coastal and Marine Geology Program |
| Description | 13 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes |
| First page | 2061 |
| Last page | 2073 |
| Conference Title | 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes |
| Conference Location | New Orleans, LA |
| Google Analytic Metrics | Metrics page |