Models of global warming assume rising sea levels will affect shorelines uniformly.
Research by Jordan Slott at Duke University in Durham, North Carolina, has shown that rather than eroding the shore uniformly, strong waves from higher numbers of tropical storms removed sand from the beaches in some regions and deposited it elsewhere.
Significantly, the sea encroached some areas 10 times further than would be expected from rising water levels alone. (Geophysical Research Letters, vol 33, p L18404)
(“In Brief” “If rising seas don’t drown you they’ll wash your home away”, New Scientist, Vol 2571, 30th September 2006 p20)