Model results indicate that a rising sea level at a rate of 2 mm/yr results in an slight landward retreat of the ebb-tidal delta of the mouth area, whereby channels and shoals undergo increased sedimenta tion over time (0.25 mm/yr on average). This sedimentation is the result of increased sand import from the offshore areas. The latter changes become stronger with increasing rate of sea level rise. In the Western Scheldt estuary, a rising sea level rather causes the redistribution of sand in this area, such that sand is deposited on the shoals and tidal flats. The overall sedimentation rate in the latter area is 0.15 mm/yr. Higher rates of SLR increase sedimentation on the shoals, which is mostly provided through deepening of channels and the reduction of the sand loss to the mouth area.