PAST PROJECTSBournemouth Beach Timber Groyne Replacement winter 2015/16
Part of a 17-year Beach Management Scheme to protect Bournemouth’s coastline
Bournemouth Borough Council
- The new groynes are part of the larger 17-year Beach Management Scheme 2015-2032
- Initial funding of £3.6m has enabled the first phase of the Bournemouth Beach Management Scheme to be delivered
- 10 groynes have been replaced: Nos. C27 to C36
- Project cost: £3.6m
Phase One, Year One of a 17-year project. The ten replacement groynes are the third series (C-series) of groynes to be constructed on Bournemouth’s beach. They are a similar design to the old groynes and require approximately £80,000 of timber per groyne.
The programme of work was restricted by tides as the outer ends of the groynes could only be worked on during the low spring tides. The piles for all 10 groynes were driven into position. Some groynes can rise up to 17 planks high, or until the substrate is reached. With each plank being 300mm wide, considerable excavation was required around each groyne area to enable the planking work to be carried out.
Different timber species are being used to construct the C-series groynes, in order to test and monitor their durability. Some use Greenheart piles with Greenheart planking, others have a combination of Greenheart piles with Ekki planking and Ekki piles and planking. One groyne is constructed entirely from Basralocus piles and planking.
Five of the eight existing B-series groynes in the area were removed as part of the scheme. The planks and piles of these have been salvaged, carefully labelled and retained for inspection with a view to investigating the condition of the timber after 29-31 years of service.