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Potential of UAVs for Monitoring Mudflat Morphodynamics (Application to the Seine Estuary, France) ArchiMer
Jaud, Marion; Grasso, Florent; Le Dantec, Nicolas; Verney, Romaric; Delacourt, Christophe; Ammann, Jerome; Deloffre, Julien; Grandjean, Philippe.
Intertidal mudflats play a critical role in estuarine exchange, connecting marine and continental supplies of nutrients and sediments. However, their complex morphodynamics, associated with a wide range of physical and biological processes, are still poorly understood and require further field investigation. In addition, mudflats are challenging areas for Structure-from-Motion (SfM) photogrammetric surveys. Indeed, the mudflats generally hold back residual tidal water, which can make stereo restitution particularly difficult because of poor correlations or sun-glint effects. This study aims to show the potential of light UAVs (Unmanned Aerial Vehicles) for monitoring sedimentary hydrodynamics at different spatial scales in a silty estuary. For each UAV...
Tipo: Text Palavras-chave: Coastal monitoring; Unmanned Aerial Vehicle; Photogrammetry; Estuary; Mudflat areas; Morphological features.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00326/43721/43167.pdf
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The Stone Tidal Fish Weirs of the Molene Archipelago, Iroise Sea, Brittany, Western France: a long-term tradition with early megalithic origins ArchiMer
Gandois, Henri; Stephan, Pierre; Cuisnier, David; Hulot, Olivia; Ehrhold, Axel; Paul, Marine; Le Dantec, Nicolas; Franzetti, Marcaurelio.
This reports on a project that combined evidence gleaned from aerial photographs, place-names, interviews, topography, LIDAR data, and sonar bathymetry to locate stone tidal fish weirs in the Molene Archipelago. The results were verified by diver and pedestrian visual surveys. Models of Holocene sea-level change allowed a group of possibly Late Mesolithic-Early Neolithic weirs to be recognized, with a second group broadly dated to the later Neolithic-Early Bronze Age. The construction of these long megalithic structures is compared to the funerary monuments for which the Molene Archipelago is well known, in terms of technique, cost, and societal organization.
Tipo: Text Palavras-chave: Tidal weirs fish traps Mol<; Bold>; E<; /bold>; Ne Archipelago megalithic constructions sea-level change Mesolithic Neolithic.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00430/54208/55907.pdf
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