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Laboratory Investigation of Beach Scarp and Dune Recession Due to Notching and Subsequent Failure

Erikson, Li LU ; Larson, Magnus LU and Hanson, Hans LU (2007) In Marine Geology 245(1-4). p.1-19
Abstract
Analytical models to calculate notch development and subsequent mass failure of dunes are presented. The notch evolution model is based on a transport equation for sediment from the dune and the sediment volume conservation equation, whereas the models of mass failure are derived using elementary engineering statics and soil mechanics. An empirical transport coefficient in the model describing the notch growth rate is found to be related to the hydrodynamic forcing at the dune normalized by geotechnical parameters describing the resistive strength of the dune. Two modes of mass failure are modeled whereby the overhang generated by the removal of material from the dune foot (notching) slides downward or topples over following the... (More)
Analytical models to calculate notch development and subsequent mass failure of dunes are presented. The notch evolution model is based on a transport equation for sediment from the dune and the sediment volume conservation equation, whereas the models of mass failure are derived using elementary engineering statics and soil mechanics. An empirical transport coefficient in the model describing the notch growth rate is found to be related to the hydrodynamic forcing at the dune normalized by geotechnical parameters describing the resistive strength of the dune. Two modes of mass failure are modeled whereby the overhang generated by the removal of material from the dune foot (notching) slides downward or topples over following the development of a tensile crack some distance shoreward of the maximum notch depth. The accuracy of the notch evolution and mass failure models are assessed by comparing

calculated recession distances against measurements from a small-scale laboratory experiment. (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
tensile strength, wave impact, notching, dunes, beach scarps
in
Marine Geology
volume
245
issue
1-4
pages
1 - 19
publisher
Elsevier
external identifiers
  • wos:000250952900001
  • scopus:35248834680
ISSN
0025-3227
DOI
10.1016/j.margeo.2007.04.006
language
English
LU publication?
yes
id
85a37680-c0d4-45f0-a015-9364a67647fa (old id 740162)
date added to LUP
2007-12-11 16:07:51
date last changed
2017-10-01 04:39:07
@article{85a37680-c0d4-45f0-a015-9364a67647fa,
  abstract     = {Analytical models to calculate notch development and subsequent mass failure of dunes are presented. The notch evolution model is based on a transport equation for sediment from the dune and the sediment volume conservation equation, whereas the models of mass failure are derived using elementary engineering statics and soil mechanics. An empirical transport coefficient in the model describing the notch growth rate is found to be related to the hydrodynamic forcing at the dune normalized by geotechnical parameters describing the resistive strength of the dune. Two modes of mass failure are modeled whereby the overhang generated by the removal of material from the dune foot (notching) slides downward or topples over following the development of a tensile crack some distance shoreward of the maximum notch depth. The accuracy of the notch evolution and mass failure models are assessed by comparing<br/><br>
calculated recession distances against measurements from a small-scale laboratory experiment.},
  author       = {Erikson, Li and Larson, Magnus and Hanson, Hans},
  issn         = {0025-3227},
  keyword      = {tensile strength,wave impact,notching,dunes,beach scarps},
  language     = {eng},
  number       = {1-4},
  pages        = {1--19},
  publisher    = {Elsevier},
  series       = {Marine Geology},
  title        = {Laboratory Investigation of Beach Scarp and Dune Recession Due to Notching and Subsequent Failure},
  url          = {http://dx.doi.org/10.1016/j.margeo.2007.04.006},
  volume       = {245},
  year         = {2007},
}