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Morphologic Change by Overwash: Establishing and Evaluating Predictors

Donnelly, Chantal LU (2007) In Journal of Coastal Research p.520-526
Abstract
The ability to predict cross-shore profile response to coastal overwash is important for both understanding how

barrier islands respond to overwash and for disaster management on developed coastlines. This study establishes

morphologic and hydrodynamic parameters for predicting the type of cross-shore profile response following

overwash for given pre-storm profile and storm conditions. More than 50 data sets were categorised into 7

different types of cross-shore profile response to overwash. These responses are: 1) crest accumulation 2)

landward translation of dunes/berms 3) dune lowering 4) dune destruction 5) barrier accretion 6) barrier rollover

(short-term),and 7) barrier... (More)
The ability to predict cross-shore profile response to coastal overwash is important for both understanding how

barrier islands respond to overwash and for disaster management on developed coastlines. This study establishes

morphologic and hydrodynamic parameters for predicting the type of cross-shore profile response following

overwash for given pre-storm profile and storm conditions. More than 50 data sets were categorised into 7

different types of cross-shore profile response to overwash. These responses are: 1) crest accumulation 2)

landward translation of dunes/berms 3) dune lowering 4) dune destruction 5) barrier accretion 6) barrier rollover

(short-term),and 7) barrier disintegration. Dimensionless parameters describing the pre-storm morphology and

storm characteristics for these data sets were then plotted in two-dimensional space and trends for the different

response types identified. For some responses it was possible to define criteria for their occurrence and for the others an approximate trend could be identified. Maximum surge level, maximum run-up level, storm

overtopping duration, beach crest height, dune width and dune volume proved some of the most important

parameters to distinguish responses. The criteria that are established and trends identified should allow the user

to qualitatively predict the overwash response of a given cross-shore beach profile to a given set of storm

conditions, using readily available data. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
hurricane impacts, beach profiles, storm impacts, barrier islands
in
Journal of Coastal Research
issue
SI 50 (special issue)
pages
520 - 526
publisher
Coastal Education and Research Foundation
external identifiers
  • Scopus:77956865664
ISSN
0749-0208
language
English
LU publication?
yes
id
3393b4b9-39fd-44cb-963c-1208c52f3698 (old id 740036)
date added to LUP
2007-12-11 15:15:38
date last changed
2016-10-13 04:29:47
@misc{3393b4b9-39fd-44cb-963c-1208c52f3698,
  abstract     = {The ability to predict cross-shore profile response to coastal overwash is important for both understanding how<br/><br>
barrier islands respond to overwash and for disaster management on developed coastlines. This study establishes<br/><br>
morphologic and hydrodynamic parameters for predicting the type of cross-shore profile response following<br/><br>
overwash for given pre-storm profile and storm conditions. More than 50 data sets were categorised into 7<br/><br>
different types of cross-shore profile response to overwash. These responses are: 1) crest accumulation 2)<br/><br>
landward translation of dunes/berms 3) dune lowering 4) dune destruction 5) barrier accretion 6) barrier rollover<br/><br>
(short-term),and 7) barrier disintegration. Dimensionless parameters describing the pre-storm morphology and<br/><br>
storm characteristics for these data sets were then plotted in two-dimensional space and trends for the different<br/><br>
response types identified. For some responses it was possible to define criteria for their occurrence and for the others an approximate trend could be identified. Maximum surge level, maximum run-up level, storm<br/><br>
overtopping duration, beach crest height, dune width and dune volume proved some of the most important<br/><br>
parameters to distinguish responses. The criteria that are established and trends identified should allow the user<br/><br>
to qualitatively predict the overwash response of a given cross-shore beach profile to a given set of storm<br/><br>
conditions, using readily available data.},
  author       = {Donnelly, Chantal},
  issn         = {0749-0208},
  keyword      = {hurricane impacts,beach profiles,storm impacts,barrier islands},
  language     = {eng},
  number       = {SI 50 (special issue)},
  pages        = {520--526},
  publisher    = {ARRAY(0xa033d08)},
  series       = {Journal of Coastal Research},
  title        = {Morphologic Change by Overwash: Establishing and Evaluating Predictors},
  year         = {2007},
}