Résumé
Since reliable shoreline monitoring has been available, a widespread trend of coastal retreat has been observed in many areas. Today, it is estimated that nearly 70% of sandy coasts worldwide are affected by erosion. This situation is even more pronounced for atolls and low-lying islands in the Oceania region, which are particularly exposed to coastal erosion and marine flooding risks. This presentation will focus on a few past and ongoing research projects in New Caledonia, Vanuatu, French Polynesia, and Fiji, which aim to characterize these coastal hazards and their dynamics, while contributing to improved shoreline monitoring knowledge to better account for current changes in coastal management, governance, and protection of coastlines and low-lying islands. Two key points will be emphasized: the implementation of participatory shoreline monitoring by local communities (especially school groups) through beach profile measurements as part of climate change awareness activities, and the use of drones for coastal surveying. Ultimately, these monitoring datasets could serve as the foundation for a genuine coastal observatory to track shoreline changes and trends in response to climate change.