ABSTRACT
The n power is generally taken as 2 and that is similar to the third power of the mean flow velocity, which describes sediment transport. The sign of n depends on the element volume (i.e. wet volume ‘+’ (channels) and dry volume ‘-’ (tidal flats and ebb-tidal delta)). Inlet evolution has no influence on the cE which is always in equilibrium and acts as the boundary condition of the system. Thus, if the system is in equilibrium, no sand requirement is found and the ce of all elements is equal to the cE. If the system is not in equilibrium, the ce deviates from the cE. In case, the ce is higher than the cE, this implies sediment surplus and erosion occurs (negative accommodation space). If the ce is smaller than the cE, sediment demand exists implying sedimentation of the element (positive accommodation space). Erosion/sedimentation resulting to volume change of an element depends on the sediment availability, which is proportional to the difference between the ce and actual concentration (c).
