Publications scientifiques

Intertidal marshes are important habitats for nekton. However, historical draining and dyking hampered European coastal wetlands. Marsh restoration is therefore critical not only to improve their capacity to protect coastal lines but also to rehabilitate their ecological functionalities. The benefits of intertidal marsh restoration for nekton community composition and feeding ecology are examined in a case study within the largest macrotidal estuary in Western Europe (Gironde).

Rising sea level along with the occurrence of greater and more frequent storms would cause not only coastal flooding, but also beach erosion and shoreline retreat problems. The Almanarre beach along the western Giens tombolo is socio-economically and heavily vulnerable to accelerated sea level rise due to its high touristic value and low-lying topography. Therefore, it is necessary to quantify the impacts of sea level rise (SLR) on the morphodynamics in this area, e.g. to evaluate the relationship between the beach erosion and SLR.

The COAST-HF_Marel-Iroise station is a scientific floating platform in the Ifremer in situ test site of Sainte Anne du Portzic equipped with various sensors to monitor the local metocean conditions (Trasch Martin, 2023). It provides a rich array of input data for field campaign on mooring line tension of this station, both with and without the presence of biofouling.

Le marégraphe de Marseille est à la fois le bâtiment et l'appareil d'observation du niveau de la mer qu'il abrite. Créé en 1885 pour déterminer le niveau moyen de la mer formant l'origine des altitudes continentales françaises, il observe le niveau de la mer depuis cette époque. Classé monument historique et désormais complété d'instruments géophysiques modernes, il forme un observatoire dédié à la géodésie et aux sciences du changement climatique.

The storm surge is the non-tidal component of coastal sea-level. It responds to the atmosphere both through the direct effect of atmospheric pressure on the sea-surface, and through Ekman transport induced by wind-stress. Tide gauges have been used to measure the sea-level in coastal cities for centuries, with many records dating back to the 19th-century or even further, at times when direct pressure observations were scarce.

In this study, alternatively to the megathrust, we identify upper-plate normal faults orthogonal to the trench as a possible tsunami source along the Lesser Antilles subduction zone. The Morne Piton fault system is such a trench-perpendicular upper crustal fault at the latitude of Guadeloupe.

In the context of climate change, height and frequency variations in extreme sea levels (ESLs) are studied using deterministic and probabilistic approaches. However, this type of approach does not highlight the dynamic effects (waves, currents) generated by metocean events (storms, cyclones, long swells, and tsunamis) beyond their effects on sea levels. In particular, ESL estimates are calculated by considering the main determining physical factors but cannot include all the effects of these factors. Ultimately, this can lead to confusion between ESL and hazard.

Understanding and precisely dating the sedimentological imprint of storm-induced back-barrier washover deposits is challenging, even more so in macro-tidal environments. Indeed, in such a situation, significant storms may not lead to any washover deposits, for instance if they occurred during low tide. To tackle this challenge, we propose a method based on crossing sedimentology, historical impacts from archives and weather-marine data, together with dating, statistics and modeling technique.

In this data paper, the sea level time series at Socoa (Saint-Jean-de-Luz, southwestern France) is extended through a data archaeology exercise. We conducted a comprehensive study of national and local archives to catalogue water level records stored in ledgers (handwritten record books) and charts (marigrams from mechanical float gauges), along with other associated documents (metadata). A dedicated effort was undertaken to preserve more than 2000 documents by archiving them in digital formats.