Influence of Changing Management Regimes on the Morphodynamic Response of a Mixed Gravel and Sand Barrier Beach

The morphodynamic response of a mixed gravel and sand barrier is considered, by reference to storm conditions of varying magnitude, and under differing management regimes. Observations focus on evolution of the barrier at the temporal scale of the storm event, but the response during these episodic events is placed in context with potential impacts on longer term decadal scale geomorphological evolution. Decadal scale evolutionary trends indicate that the total volume of the barrier is declining and that the frequency of overwashing events and rate of rollback of the barrier is likely to increase. Changing profile and sediment sorting responses are evident during the interim phase, immediately following changes in management practice. Modifications to management practice present new issues that may include the possibility of fragmentation on the barrier.