UK ports, harbours and marinas require a lot of maintenance dredging in order to remain accessible to vessels at all states of the tide.
Much of the sediment removed is deposited in deep water at sea and is thus removed from the inshore sediment system. Rising sea levels mean that our coastline is becoming increasingly prone to erosion, with the result that there is also an increased risk of flooding in low-lying coastal areas.
Usually depositing dredged material at sea is the cheapest option, although it is generally recognised that this is not the most sustainable use of coastal sediments removed in this way. At Pevensey, through a review of regular beach surveys, it became apparent that inshore beach volumes seemed to be falling, and that removal of sediment from the nearby marina could be adding to the problem.
By working with the marina owners, Boskalis Westminster as the dredging subcontractor, the Crown Estate, as owners of the seabed, and the Marine Management Organisation, Pevensey Coastal Defence Ltd has been able to redirect sand that would otherwise have been lost offshore, so that it has a chance of returning to the foreshore.
By expanding the monitoring regime it is hoped to demonstrate a benefit to the local coastline.
First visit Monitor Report, Pevensey Coast Defence Ltd, East Sussex, September 2015
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