ABSTRACT
These models apply only in cases where the tidal discharge is substantially greater than river discharge. Most estuaries are hypersynchronous, and tidal currents attain maximum strength in middle or landward reaches. Intensification of tidal currents causes bed erosion and resuspension of bed sediment. In the Gironde estuary, these processes produce a tidal turbidity maximum in upper re ache^.^ In the upper Delaware River estuary where dredging has removed shoals and rock, the effects of friction are reduced so that convergence exceeds friction. Consequently, tidal amplitude increases toward the estuary head.''
