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There is no doubt that climate change will raise the sea level, even if there is quite some u ncertainty about when and how much. Along all continental shores, beaches and wetlands will be drowned. One may also expect that extreme water levels will occur more frequently and that they will cause greater damage. Low-lying sedimentary coasts will be most affected. However, these coasts will not remain passive. Like during the Holocene marine transgression, natural sedimentary processes will produce changes in the coastal morphology. Morphodynamics will mitigate the negative impact of a higher sea level at some places, such that the bathymetry keeps pace with sea level. At other places however, morphodynamics will exacerbate the negative impact of sea-level rise by enhancing coastal retreat. The present experience with artificial coastal nourishment learns that we can take advantage of natural coastal morphodynamics to counteract this enhanced coastal retreat. A sediment strategy aims at mitigating the negative impact of sea-level rise by a set of measures that take optimal use of existing natural morphodynamic processes and existing sand or gravel resources. These measures and the underlying conditions are discussed in this paper. 1. The active coastal zone Sedimentary coasts respond dynamically to the action of waves and currents. In shallow w ater, waves and current have the capacity to pick up sedimentary particles from the seafloor and to transport them across and along the shore. Areas where wave and current action are strongest generally erode, while areas where wave and current action are weakest accrete. These areas are variable according to temporal fluctuations in the strength of currents and waves. The active coastal zone is a coastal strip with alternating accretion and erosion by a permanent internal redistribution of sediment. It covers the following areas:

A Sediment Strategy For Coastal Zone Climate Change Adaptation