A one-dimensional semi-empirical model is presented, which simulates t
he morphological behaviour of a tidal basin in response to a change in
one or more of the extrinsic conditions. The model is based on three
equilibrium parameters: the channel cross-sectional area, the flats' s
urface area and the flats' level. The model is tested for three scenar
ios, namely a partial closure, an accelerated sea level rise and a cha
nge in the tidal range. It is verified by simulating changes in the Fr
iesche Zeegat, the Netherlands, for which model results are compared w
ith measurements.