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Suffolk
Liverpool Bay
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iCOASST

Pilot Sites


iCOASST demonstrated the capability of the methods being developed in two contrasting pilot sites. The results of the modelling the Deben estuary and open coast are given here

Suffolk Coast

The Suffolk coast in eastern England, has a north-south orientated coast facing the North Sea. It is characterised by fairly small tides, a bimodal wave climate with waves from the north-east and south-east and coarse grained gravel beaches such as the Orfordness shingle complex. There are a number of small estuaries and more ephemeral lagoons.

The Suffolk composition focuses on the Deben estuary and surrounding shorelines which are typical of the Suffolk region. This part of the coast is subject to the wave climate of the southern North Sea. The mean tidal prism of the estuary is approximately 17 x 106 m3 and the bottom sediments are predominantly muddy (Burningham and French, 2006). The neighbouring open coast shorelines comprise mixed sediment beaches partially backed by soft cliffs in places. Both the estuary and the open coast in this part of Suffolk have been transformed by human interventions, including significant land reclamation and the construction of numerous sea defences, especially in the 19th and 20th century. The ebb-delta shoals at the mouth of the Deben show a broadly cyclic behaviour whereby the updrift shoal progressively extends until it breaches, after which the sediment is released to the downdrift coast.

Figure 1. Initial composition for the Deben estuary and surrounding shorelines.

References

Burningham, J., French, J.R. (2006). "Morphodynamic behaviour of a mixed sand-gravel ebb-tidal delta: Deben estuary, Suffolk, UK." Marine Geology 225, 23-44.