期刊
CONTINENTAL SHELF RESEARCH
卷 30, 期 7, 页码 781-792出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2010.02.001
关键词
Double-sandbar system; Meso-macro tidal environment; Storm impact; Nearshore; Video imaging; Short-term morphodynamics; Truc Vert Beach
类别
资金
- French Service Hydrographique et Oceanographique de la Marine (SHOM)
- French Delegation Generale de l'Armement (DGA)
- RELIEFS/INSU
- Netherlands Organisation for Scientific Research NWO [864.04.007]
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 8 m, induced dramatic changes in the double sandbar system. The subtidal outer bar migrated offshore rapidly (up to 30-50 m/day) and its preexisting 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. (C) 2010 Elsevier Ltd. All rights reserved.
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