New groyne could offer ‘buffer zone of protection’
A proposed wooden groyne at St Clair could aid in the fight against sealevel rise and cause the beach to once again build up with sand, a Dunedin man says.
Jules Radich, who lives on the hills of St Clair, submitted to both the Otago regional and Dunedin city councils this week, urging a groyne be built at the site of the wooden poles at the beach.
The design could copy that of the doublerow structure built there in 1921.
Mr Radich said in the summer swells pushed sand on to the beach, and the proposed structure could hold it there for winter.
Eventually this would raise the sand level by a few metres, he said.
This would not only make the beach more beautiful, but act as a barrier against sealevel rise.
‘‘It would be a buffer zone of protection for South Dunedin.’’
As there was already the outline of a structure there it would be easy to get permission, he said.
‘‘So we can build this one and once everyone sees that it’s building up the sand and gets used to the idea, we can put two or three of them here.’’
Past groynes did not survive as they were not well maintained, he said.
He was passionate about the initiative as he ‘‘loved the beach’’.
‘‘I walk the dog on the beach. I go fishing and diving out here.’’
He consulted contractors about the project and estimated the cost to be about $500,000.
The city council could pay for it, but money could also be sourced from a regional council fund, he said.
February would be the ideal time for the groyne to be built, before the sand was swept out again.
A Tonkin and Taylor report in 2011 said ‘‘while the existing shoreline is dynamically stable, there is a risk with future sea level rise that landward retreat of the beach face could occur’’.
To protect the beach from the rock pools to St Kilda would require 10 such structures, the report said.
South Coast Boardriders Association president Duan Reardon said groynes could be good, but it was important to consult with surfers.
‘‘I suppose if it’s down the beach where the piles are I could see that being pretty good, personally.’’
The location was very important, he said.
‘‘They’ve got groynes overseas and they break up the swells pretty well.
‘‘It would definitely bring the sand back. All the sand’s at St Kilda now and you’re struggling to get a car park there on a nice day.’’
Relevant city council staff were not available to comment on the project yesterday.