MULTIDECADAL SHORELINE VARIABILITY LINKED WITH ESTUARINE SANDBANK WELDING: THE NORTH MEDOC COAST, SOUTHWEST FRANCE

Sandy coasts at the edge of inlet or estuary mouth often show the largest shoreline variability However, previous work primarily addressed small scale tidal inlets as time and space scales of morphological change make the system much easier to monitor. T he aim of this study is to understand and quantify the controlling factors affecting shoreline change along the North Medoc Coast adjacent to the Gironde estuary mo uth, SW France Bathymetric surveys (1909 2021) and shoreline data from various sources (1940 2021) show that a massive estuarine sandbank welded to the shore in the early XX th century. Since then, the bulge of sand has been diffusing alongshore, causing the shoreline to erode by up to ~400 m over the last 80 years. This study suggests that it is critical to monitor bathymetric changes in such environment to understand chronic erosion impacts on coastal infrastructures, to better anticipate future shoreline change and guide coastal management strategies.< Réduire

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MULTIDECADAL SHORELINE VARIABILITY LINKED WITH ESTUARINE SANDBANK WELDING: THE NORTH MEDOC COAST, SOUTHWEST FRANCE

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