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The Poole Bay Partnership

Poolebay.net was first published in response to the high level of public interest in the major beach replenishment projects of 2005-2007.

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Storm Repairs 2014 - Shore Road towards Branksome beach

Equipment on the beach

Bulldozer to move sand around on the shore to produce the finished beach level
Excavator to move the pipes into position so the pipeline can be extended as necessary, and to create the temporary bund whilst pumping and ashore
Pipe Loader to transport the pipes around the beach to ensure the same can reach all areas within the renourishment scheme
Beach work is being carried out by Ovenden Earthmoving.

Equipment at sea

Monitoring buoy to measure seawater turbidity levels in the area adjacent to the works
Jenkins Marine multicat workboat Stour or Buffalo used to move the pipeline off the beach and into position ready for the dredger to pump the sand ashore
Trailing hopper dredger Magni R

Multicat workboat Stour

Trailing hopper dredger Magni R

Method

Lengths of pipe were brought to site by road and welded together on the beach to create a 600mm diameter pipeline (sinkerline) approximately 700m long which was towed from the beach, floated into position and then sunk to the seabed prior to the replenishment work.

At the seaward end of the sinkerline will be 36m of rubber pipes that will be lifted off the seabed and connected to the dredger every time it pumps sand to the shore.

The landward end of the sinkerline is fitted with a steel flange from which sections of shoreline pipe (approximately 12m long) can be bolted together to discharge sand to the required locations. Y-pieces with valves can be introduced to the pipeline to direct the loads to different areas of the beach.

Sand bunds are pushed both toward the seawall (for protection) and towards the shoreline to retain the new sand on the beach and avoid losses back to sea. The sand/water mixture from the pipeline flows in between these bunds where the sand settles on the beach, with the water returning to sea.