City of Gold Coast completed works in late 2013 to reinstate Kirra Point groyne by 30 metres to its original constructed length.
In 1972, two groynes were constructed at Kirra Point and Miles Street to mitigate coastal erosion along southern beaches.
In 1996, the City removed 30 metres of Kirra groyne after the commencement of the Tweed River Entrance Sand Bypass Project. These works were undertaken to assist with the movement of increased volumes of sand resulting from the bypass project.
As the movement of sand along southern Gold Coast beaches returned to more natural levels, community stakeholders expressed a desire to improve recreational surfing amenity at Kirra Point, and that the City should consider reinstating Kirra Groyne to its original constructed length of 180 metres.
As a result, the City invested $800,000 in the reinstatement of the groyne to its original length. The works are a key element of the Mayor's strategic initiative to invest in the future management of Gold Coast foreshores and align to the City's Ocean Beaches Strategy.
Project Kirra involved the placement of specialist rock material in layers to form the groyne structure. The rock armour layers are the most important elements of the groyne as they resist wave energy and must meet design specifications.
The reinstatement works required both primary (10-15 tonnes) and secondary (5-8 tonnes) rock layers.
To meet project requirements, the City sourced suitable rock materials from a number of sites in Queensland and New South Wales, including the same material used to construct Kirra Groyne and Kirra seawalls in 1972.
The massive rocks (10-15 tonnes) were transported to Kirra using large truck floats, with special arrangements to use public roads.
The City's project team partnered to deliver the works with the Griffith Centre for Coastal Management. The partnering included sharing of information around construction methods, testing and certification, and coastal engineering issues.
The Centre for Coastal Management is a research centre based in the Science, Environment, Engineering and Technology Group of Griffith University.
As a result of the lengthened groyne, sand movement has already begun with the beach width increasing as seen in the December 2013 photo.
Further coastal imaging resources can be found on external websites below.
On Friday 13 December 2013, the final rocks were placed at Project Kirra, completing major works at the site. Over 7000 tonnes of specialised rock material were used.
Queen Elizabeth Park was then reinstated to its original condition ready for the Christmas holiday period.
All specialist plant, including a heavy lift rock grabber, were working on site. Progressive deliveries of rock material were completed after sourcing and testing.
Preparation of the groyne crest to accommodate heavy machinery began, and work was underway using specialised equipment to place large rocks.
The supply of rock to site for Project Kirra commenced. View the Kirra Point schematic map.
The initial stage of works commenced on 29 July. This involved the establishment of access for heavy machines, site fencing and stockpiling of smaller rock material. The extraction and testing of rock at source quarries began in preparation for transport.
Images courtesy of Tweed River Entrance Sand Bypassing Project (New South Wales and Queensland)
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