Sediment capture and deposition processes in coastal lagoons

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Intermittently closed and open lagoons and lakes are an increasing problem for coastal managers around Australia: they can limit fish migration, and lead to degraded water quality and an increased risk of flooding. The Murray mouth, for example, closed in 1981 and still exists in a congested state. Closure would have disastrous consequences for the area in general and the Coorong in particular, with significant damage to Australia's environmental reputation. An optimised dredging operation at the mouth (currently costing $4.6 m annually), together with better management of river discharges, will have the potential to improve conditions in the area.