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Implications of Morphodynamic Time-Scale for Coastal Protection

Hanson, Hans LU and Larson, Magnus LU (2005) International Conference on Coastal Engineering, 2004 In Coastal Engineering 2004, Vols 1-4 p.2620-2632
Abstract
As reported in several studies, even though properly designed, it is possible that groin systems not only cause down-drift beaches to erode, but also contribute to the generation of rip currents. These rip currents run along the updrift side of the structure, moving sediment offshore where it may be, at least in part, lost from the system. It is well known that the directionality of the incident waves is a central factor for the shoreline response to groins. Until now, however, this directionality has been characterized only by the ratio of net transport rate Q(n) to gross transport rate Q(g). In this study it is concluded that the phase lag between the forcing and the morphodynamic response is another key factor responsible for these... (More)
As reported in several studies, even though properly designed, it is possible that groin systems not only cause down-drift beaches to erode, but also contribute to the generation of rip currents. These rip currents run along the updrift side of the structure, moving sediment offshore where it may be, at least in part, lost from the system. It is well known that the directionality of the incident waves is a central factor for the shoreline response to groins. Until now, however, this directionality has been characterized only by the ratio of net transport rate Q(n) to gross transport rate Q(g). In this study it is concluded that the phase lag between the forcing and the morphodynamic response is another key factor responsible for these offshore losses. Based upon this, a relaxation time for open-coast systems and a non-dimensional morphodynamic response factor for groin compartments are introduced as new design parameters for groin systems. These parameters provide an indication about the time it takes for the morphodynamic system to adjust to a change in the hydrodynamic forcing conditions. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Coastal Engineering 2004, Vols 1-4
pages
13 pages
publisher
World Scientific
conference name
International Conference on Coastal Engineering, 2004
external identifiers
  • WOS:000230438502032
  • Scopus:84950312439
DOI
10.1142/9789812701916_0211
language
English
LU publication?
yes
id
fd130303-bf8a-4282-b531-6a9dd8e0a7fb (old id 770378)
date added to LUP
2008-01-18 07:05:25
date last changed
2016-10-13 04:46:09
@misc{fd130303-bf8a-4282-b531-6a9dd8e0a7fb,
  abstract     = {As reported in several studies, even though properly designed, it is possible that groin systems not only cause down-drift beaches to erode, but also contribute to the generation of rip currents. These rip currents run along the updrift side of the structure, moving sediment offshore where it may be, at least in part, lost from the system. It is well known that the directionality of the incident waves is a central factor for the shoreline response to groins. Until now, however, this directionality has been characterized only by the ratio of net transport rate Q(n) to gross transport rate Q(g). In this study it is concluded that the phase lag between the forcing and the morphodynamic response is another key factor responsible for these offshore losses. Based upon this, a relaxation time for open-coast systems and a non-dimensional morphodynamic response factor for groin compartments are introduced as new design parameters for groin systems. These parameters provide an indication about the time it takes for the morphodynamic system to adjust to a change in the hydrodynamic forcing conditions.},
  author       = {Hanson, Hans and Larson, Magnus},
  language     = {eng},
  pages        = {2620--2632},
  publisher    = {ARRAY(0x9ec8948)},
  series       = {Coastal Engineering 2004, Vols 1-4},
  title        = {Implications of Morphodynamic Time-Scale for Coastal Protection},
  url          = {http://dx.doi.org/10.1142/9789812701916_0211},
  year         = {2005},
}