Short-term to decadal-scale onshore bar migration and shoreline changes in the vicinity of a megatidal ebb delta. Robin, N., Levoy, F., Monfort, O., & Anthony, E. Number: F4
Short-term to decadal-scale onshore bar migration and shoreline changes in the vicinity of a megatidal ebb delta [link]Paper  doi  abstract   bibtex   
Swash bar development has been well documented from coasts with low to moderate tidal ranges, while studies of the effects of these forms on the morphology and dynamics of the adjacent shore in large tide range environments are rare. The analysis of sequential vertical aerial photographs was combined with field work in order to highlight the effects of swash bar development on the adjacent shoreline in the vicinity of a megatidal inlet (mean spring tidal range of 11 m). Swash bars are observed to form on the ebb tidal delta and to migrate landward before welding onto the coast. A close relationship was noticed between the position of the swash bar and shoreline dynamics. The bar protects the shore against wave attack in a sedimentary system controlled by longshore transport. This protective role is, however, modulated by the large tidal range. As the bar migrates upward toward the high-tide level and the subaerial beach, it develops morphologically into a transverse form that acts as a cross-shore obstacle to longshore sediment transport, thus resulting in shoreline accretion updrift and in strong erosion downdrift. This disturbance may persist for years because of the relatively slow speed of movement of the bar at this stage, an aspect characteristic of large tide range environments. This pattern of behavior differs fundamentally from that documented in the literature where the perturbation of the longshore sediment transport occurs over shorter periods. An original conceptual model of swash bar morphodynamics and repercussions on the adjacent shoreline for this megatidal environment is proposed.
@article{robin_short-term_2009,
	title = {Short-term to decadal-scale onshore bar migration and shoreline changes in the vicinity of a megatidal ebb delta},
	volume = {114},
	rights = {Copyright 2009 by the American Geophysical Union.},
	issn = {2156-2202},
	url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2008JF001207},
	doi = {10.1029/2008JF001207},
	abstract = {Swash bar development has been well documented from coasts with low to moderate tidal ranges, while studies of the effects of these forms on the morphology and dynamics of the adjacent shore in large tide range environments are rare. The analysis of sequential vertical aerial photographs was combined with field work in order to highlight the effects of swash bar development on the adjacent shoreline in the vicinity of a megatidal inlet (mean spring tidal range of 11 m). Swash bars are observed to form on the ebb tidal delta and to migrate landward before welding onto the coast. A close relationship was noticed between the position of the swash bar and shoreline dynamics. The bar protects the shore against wave attack in a sedimentary system controlled by longshore transport. This protective role is, however, modulated by the large tidal range. As the bar migrates upward toward the high-tide level and the subaerial beach, it develops morphologically into a transverse form that acts as a cross-shore obstacle to longshore sediment transport, thus resulting in shoreline accretion updrift and in strong erosion downdrift. This disturbance may persist for years because of the relatively slow speed of movement of the bar at this stage, an aspect characteristic of large tide range environments. This pattern of behavior differs fundamentally from that documented in the literature where the perturbation of the longshore sediment transport occurs over shorter periods. An original conceptual model of swash bar morphodynamics and repercussions on the adjacent shoreline for this megatidal environment is proposed.},
	issue = {F4},
	journaltitle = {Journal of Geophysical Research: Earth Surface},
	author = {Robin, Nicolas and Levoy, Franck and Monfort, Olivier and Anthony, Edward},
	urldate = {2019-04-15},
	date = {2009},
	langid = {english},
	note = {Number: F4},
	keywords = {shoreline evolution, megatidal environment, bar migration, tidal inlet, swash bar}
}
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