Two- and three-dimensional double-sandbar system behaviour under intense wave forcing and a meso–macro tidal range. Almar, R., Castelle, B., Ruessink, B. G., Sénéchal, N., Bonneton, P., & Marieu, V. 30(7):781–792. Number: 7
Two- and three-dimensional double-sandbar system behaviour under intense wave forcing and a meso–macro tidal range [link]Paper  doi  abstract   bibtex   
Five weeks of hourly, 10-min time-exposure video images were used to analyze the meso–macro-tidal double-barred Truc Vert Beach, SW France, under intense wave forcing. The four storms experienced, one of which with an offshore significant wave height over 8m, induced dramatic changes in the double sandbar system. The subtidal outer bar migrated offshore rapidly (up to 30–50m/day) and its pre-existing crescentic pattern was wiped out. The seaward-protruding parts of the outer bar barely migrated offshore during the most intense storm, whereas a landward-protruding part was shed off. Over the entire study period, the outer-bar dynamics was dominated by alongshore-averaged changes rather than alongshore non-uniform changes, while the opposite was observed for the inner bar. In addition, the outer-bar dynamics was predominantly controlled by the time-varying offshore wave conditions, whereas the inner-bar dynamics was influenced largely by the tide-range variations. Our observations put forward the key role of morphological settings (the presence of a subtidal bar and its shape) and tidal range in governing inner-bar behaviour within a double sandbar dynamics, and provide strong support for previous suggestions that sandbars cannot be studied in isolation.
@article{almar_two-_2010,
	title = {Two- and three-dimensional double-sandbar system behaviour under intense wave forcing and a meso–macro tidal range},
	volume = {30},
	issn = {0278-4343},
	url = {http://www.sciencedirect.com/science/article/pii/S0278434310000348},
	doi = {10.1016/j.csr.2010.02.001},
	abstract = {Five weeks of hourly, 10-min time-exposure video images were used to analyze the meso–macro-tidal double-barred Truc Vert Beach, {SW} France, under intense wave forcing. The four storms experienced, one of which with an offshore significant wave height over 8m, induced dramatic changes in the double sandbar system. The subtidal outer bar migrated offshore rapidly (up to 30–50m/day) and its pre-existing crescentic pattern was wiped out. The seaward-protruding parts of the outer bar barely migrated offshore during the most intense storm, whereas a landward-protruding part was shed off. Over the entire study period, the outer-bar dynamics was dominated by alongshore-averaged changes rather than alongshore non-uniform changes, while the opposite was observed for the inner bar. In addition, the outer-bar dynamics was predominantly controlled by the time-varying offshore wave conditions, whereas the inner-bar dynamics was influenced largely by the tide-range variations. Our observations put forward the key role of morphological settings (the presence of a subtidal bar and its shape) and tidal range in governing inner-bar behaviour within a double sandbar dynamics, and provide strong support for previous suggestions that sandbars cannot be studied in isolation.},
	pages = {781--792},
	number = {7},
	journaltitle = {Continental Shelf Research},
	shortjournal = {Continental Shelf Research},
	author = {Almar, R. and Castelle, B. and Ruessink, B. G. and Sénéchal, N. and Bonneton, P. and Marieu, V.},
	urldate = {2019-04-15},
	date = {2010-04-30},
	note = {Number: 7},
	keywords = {Short-term morphodynamics, Double-sandbar system, Meso–macro tidal environment, Nearshore, Storm impact, Truc Vert Beach, Video imaging}
}

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