Abstract
In recent years a start has been made in developing the concept of the coastal sediment compartment because of a growing interest in the question of sediment budgets. In many ways the coastal compartment is the equivalent of the drainage basin in terrestrial geomorphology-a unit within which it is theoretically possible to compute sediment gains and losses and so arrive at a quantitative budget statement. On coasts of relatively free transport where natural 'sediment-tight' compartments do not exist it is necessary to define notional compartments or longshore drift cells, the boundaries of which may be placed where transport rates are reduced, change significantly or are more easily measured.
Hierarchies of compartments may be identified where large exclusive compartments may contain smaller non-exclusive subcompartments. Again the analogy is with different orders of drainage basins in the terrestrial situation (Davies, 1979).
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