Figure 3. Impact of Sea Level Rise on Wetlands Around Charleston, South Carolina, as reported by Kanea et al. (1988) . The figure shows the shift in wetland zonation along a shoreline profile, assuming an accretion of 5 mm/yr. Vegetated wetlands would be squeezed; but tidal flats would increase. For a larger rise in sea level, even flats would be squeezed. Note that this assumes no reordering of sediment, which would not be realistic in all circumstances. Why Will We Lose Marshes? .