Sunshine Coast Council has investigations underway to trial a method of sand nourishment to replenish Maroochydore Beach and help protect the area from further erosion.
The technique, called nearshore nourishment, has not been used on the Sunshine Coast before and involves importing sand from outside the region and placing it in the water, about 300m off the beach.
Waves, currents and tides will then deposit the sand onto the beaches, providing an additional buffer to future storms and coastal erosion.
Sunshine Coast Council’s Environment Portfolio, Councillor Peter Cox, said the Coastal Hazard Adaptation Strategy guided Council’s work to manage its region’s beaches from the risk of future coastal erosion.
“A lot of work has gone on behind the scenes over several years to inform the long-term management of our coastline,” Mr Cox said.
“We are using coastal data captured through wave buoys, beach surveys, hydrographic surveys, ecological monitoring, and wind data to shape the project.
“This is in addition to studies that have shown that there is a limited supply of sand on the Sunshine Coast.
“Maroochydore Beach has been subject to significant erosion events over the years and adding new sand from outside the region, such as the Spitfire Channel in Moreton Bay, will help nourish the area and protect from further erosion.
Mr Cox said the trial will supplement the existing sand renourishment program that involves collecting sand from the Maroochy River and pumping it onto the beach.
“Trialling the new technique will assist us to make evidence-based decisions about the future management of our coastline,” Mr Cox said.
“The trial will provide critical evidence to support our understanding of how this technique works here on the Sunshine Coast.”
A dredge will collect sand from the Spitfire Channel, in Moreton Bay, and transport it to Maroochydore Beach for release, potentially using two methods.
One method may include dropping the sand from the bottom of the barge and the other will spray the sand in a rainbow shape into the water. The results of both methods will be compared.
Surf amenity will be a consideration throughout the trial.
Mr Cox said although this technique had not been used on the Sunshine Coast, it was a well-established method and proven successful for other government bodies on the Australian east coast.
“We expect the trial will show that additional sand placed in the nearshore area, close to the sand bar, will naturally migrate to the shoreline over time,” Mr Cox said.
“This will confirm the effectiveness of this well-established methodology to enable us to use it in the future if we need to.”