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Modeling long-term beach change under interacting longshore and cross-shore processes

Hanson, Hans LU ; Larson, Magnus LU and Kraus, Nicholas C. (2010) International Conference on Coastal Engineering, 2010 In Proceedings of the Coastal Engineering Conference
Abstract
This paper presents mathematical formulations and a new numerical model GenCade that simulates beach and dune change in response to cross-shore processes of dune growth by wind and dune erosion by storms, and by gradients in longshore sand transport that will also alter shoreline position. The berm plays a central role since the potential for sand to be transported to the dune by wind depends on berm width, and sand lost in erosion of the dune during storms will widen the berm. Morphologic equilibrium considerations are introduced to improve reliability of predictions and stability of the non-linear model. An analytical solution is given to illustrate properties of the model under simplified conditions. Sensitivity tests with the numerical... (More)
This paper presents mathematical formulations and a new numerical model GenCade that simulates beach and dune change in response to cross-shore processes of dune growth by wind and dune erosion by storms, and by gradients in longshore sand transport that will also alter shoreline position. The berm plays a central role since the potential for sand to be transported to the dune by wind depends on berm width, and sand lost in erosion of the dune during storms will widen the berm. Morphologic equilibrium considerations are introduced to improve reliability of predictions and stability of the non-linear model. An analytical solution is given to illustrate properties of the model under simplified conditions. Sensitivity tests with the numerical solution of the coupled equations demonstrate model performance. Finally, the numerical model is applied to examine the consequences of groin shortening at Westhampton Beach, Long Island, New York, as an alternative for providing a sand supply to the down-drift beach. Results indicate that the sand will be released over several decades as the shoreline and dune move landward in adjustment to the new equilibrium condition with the shortened groins. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Coastal evolution, Dune erosion, GenCade, Numerical model, Shoreline change, Westhampton Beach
host publication
Proceedings of 32nd Conference on Coastal Engineering
series title
Proceedings of the Coastal Engineering Conference
editor
McKee Smith, Jane and Lynett, Patrick
pages
15 pages
publisher
Coastal Engineering Research Council
conference name
International Conference on Coastal Engineering, 2010
conference location
Shanghai, China
conference dates
2010-06-30 - 2010-07-05
external identifiers
  • scopus:84864449630
ISSN
0161-3782
ISBN
978-0-9896611-0-2
DOI
10.9753/icce.v32.sediment.62
language
English
LU publication?
yes
id
fbb2460a-e37f-40d9-a371-58ebfc481431
date added to LUP
2019-01-30 15:16:46
date last changed
2020-01-13 01:27:22
@inproceedings{fbb2460a-e37f-40d9-a371-58ebfc481431,
  abstract     = {This paper presents mathematical formulations and a new numerical model GenCade that simulates beach and dune change in response to cross-shore processes of dune growth by wind and dune erosion by storms, and by gradients in longshore sand transport that will also alter shoreline position. The berm plays a central role since the potential for sand to be transported to the dune by wind depends on berm width, and sand lost in erosion of the dune during storms will widen the berm. Morphologic equilibrium considerations are introduced to improve reliability of predictions and stability of the non-linear model. An analytical solution is given to illustrate properties of the model under simplified conditions. Sensitivity tests with the numerical solution of the coupled equations demonstrate model performance. Finally, the numerical model is applied to examine the consequences of groin shortening at Westhampton Beach, Long Island, New York, as an alternative for providing a sand supply to the down-drift beach. Results indicate that the sand will be released over several decades as the shoreline and dune move landward in adjustment to the new equilibrium condition with the shortened groins.},
  author       = {Hanson, Hans and Larson, Magnus and Kraus, Nicholas C.},
  booktitle    = {Proceedings of 32nd Conference on Coastal Engineering},
  editor       = {McKee Smith, Jane and Lynett, Patrick},
  isbn         = {978-0-9896611-0-2},
  issn         = {0161-3782},
  language     = {eng},
  month        = {12},
  publisher    = {Coastal Engineering Research Council},
  series       = {Proceedings of the Coastal Engineering Conference},
  title        = {Modeling long-term beach change under interacting longshore and cross-shore processes},
  url          = {http://dx.doi.org/10.9753/icce.v32.sediment.62},
  doi          = {10.9753/icce.v32.sediment.62},
  year         = {2010},
}