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| Stepanian, A; Levoy, F. |
| The present paper deals with the morphodynamics of intertidal bars on Omaha beach, a macrotidal beach located along the Normandy coastline. During two years (defined here as medium-term time-scale), a monthly topographic monitoring has been conducted on this beach. An analysis of the morphological evolution of the ridge and runnel systems is performed and correlated to the forcing conditions (waves and tide) recorded on the lower foreshore. Our results allow to distinguish some morphodynamical evolution sequences with one stage of accretion and one stage of destruction of the bars. In order to discriminate these two stages, an energetic criterion is used. Accretion stages correspond to long periods of fair weather conditions (significant wave height, H-s... |
| Tipo: Text |
Palavras-chave: Morphodynamique; Plage macrotidale; Barres et bâches; Normandie; France; Morphodynamics; Macrotidal beach; Ridges and runnels; Normandy; France. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00322/43274/43005.pdf |
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| Levoy, F; Monfort, O; Larsonneur, C. |
| Fluorescent tracers, often used to study longshore transports induced in the breaking zone, are here adapted to the multidirectional movements observed on macrotidal beaches, where sediment transports are dominated by wave or tide action or by the simultaneous action of both. The relative influences of these agents vary in space and time. Different techniques of quantifying fluorescent grain concentrations, by surficial or volumetric counting of samples are tested and compared. The automatic counting of fluorescent grains present in the mobile layer is also tested and validated. Comparisons, made during a preliminary experiment, between concentrations evaluated in this manner and values inferred from visual inventories are satisfactory. The different... |
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| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20437/18104.pdf |
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