Sediment-based interventions, for example beach nourishment, aim to limit coastal erosion and flood risk and have become a widely applied strategy, especially in open-coast archetypal C&S. This is in part because there is less impact on adjacent beaches and coastal ecology and also lower construction and maintenance costs compared to hard protection . In addition, it is considered a flexible strategy under more rapid SLR conditions  and can be applied in the form of a mega-nourishment strategy, wherein natural currents distribute sand along the coast . However, there are limits to this strategy due to environmental impacts, costs and the availability of potential and permitted sand reserves, which may be unable to keep up with higher rates of SLR . Simultaneously, other socioeconomic needs  may compete for sand as a limited resource . Regional and global governance provisions  could improve long-term feasibility .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report