Removal of Old Granite Island Causeway Piles

July 14, 2022
Filed under: Coastal Engineering,Marine Structures — Magryn @ 3:04 pm

As the new causeway out to Granite Island at Victor Harbour is now completed, the old causeway needed to be disassembled and removed.

Ecospec Australia have been awarded the contract to disassemble and remove the old causeway. They are doing this using a spider crane on jack-up piles which rest on the seabed.

Magryn undertook a review of their methodology and the transfer of loads from the spider crane feet to a support frame to the jack up the piles, to enable EcoSpec to safely remove the causeway structure.

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Whyalla Jetty

June 28, 2021
Filed under: Coastal Engineering — Tags: — Peter Cornish @ 1:51 pm

This group on the Whyalla jetty at the final defects inspection 25 June 2021 holding awards that this Jetty has already won. Pictured above (from left to right)

  • Kristen Clark (City of Whyalla) – client
  • Terry Magryn (Magryn) -designer
  • Adam Bolton (Maritime Constructions) – builder
  • Rick Gayler – Superintendents Representative

This year the City of Whyalla took out the IPWEA SA’s prestigious Best Public Works Project over $5.0m The Whyalla Jetty opened Sept 2020 and already had 80,000 people visit since then.

Jetty Facts:

  • Width = 4.5m.
  • Length = 165m.
  • Loop circumference = 150m.
  • Total length including loop = 315m.
  • Supported by 102 pylons driven into the seabed.
  • Made of industrial-strength pre-cast concrete slabs suitable for marine environments.
  • Steel mesh sides act as a windbreak.
  • Brushed steel balustrade along entire length.
  • Bespoke lighting installed inside the top handrail.  Each 500mm of handrail has a 50mm LED pod around the entire length of the interior and exterior balustrade.
  • 45m access ramp, built to Australian standards.
  • Open sections allow for children and people in wheelchairs to have an unobstructed view.
  • Six locations around the exterior of the jetty have sliding sleeves on the top handrail sections for children or the disabled to fish from.
  • Made possible by State Government funding and structural steel donated by the local GFG Alliance Whyalla Steelworks

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Port Germein jetty closed after Marine Assessment Report

June 3, 2021
Filed under: Coastal Engineering — Tags: , — Magryn @ 4:38 pm

The Port Germein Jetty has been partially closed after Magryn Engineers found significant deterioration in underwater pylons. In response, the District of Mount Remarkable Council has closed the last 130 metres of the jetty for the safety of the public.

 Magryn & Associates marine assessment uncovered and reported that many pylons and cross timbers showed section loss, failed bracings, and severe splitting and rotting. Magryn & Associates estimated the jetty repair works to cost $2.5 million.

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Meningie Jetty, Vessel Mooring Facility

February 9, 2021
Filed under: Coastal Engineering,Marine Structures — Tags: , — Magryn @ 2:14 pm

​Magryn have been engaged by Coorong Council to review the design and installation of the piling and framing associated with the new vessel mooring facility located at the outer end of the main Meningie Jetty.

This facility is a fixed jetty (not floating pontoons) constructed of aluminium framing with fibreglass decking.

The facility is now complete.

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Bamera Jetty Inspection

November 3, 2020
Filed under: Coastal Engineering — Tags: , — Peter Cornish @ 3:26 pm

Two of our engineers have recently undertaken an inspection (above and below water) of the Bamera jetty in Lake Bonney, for the Berri Barmera Council.

This is always challenging work, as River Murray water is very muddy, and the below water inspection needs to be done “by feel”.

Bamera Jetty closeup
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July 25, 2020
Filed under: Coastal Erosion Control,Coastal Engineering — Tags: — Magryn @ 10:58 am

Could it happen in South Australia?

The severe beach erosion of the last few days on the Central Coast of NSW was well publicised, with graphic photos and videos of houses teetering on the edge of cliffs, with combined high tides and large swell crashing into the beach below, stripping away the soil under the houses as the owners look on in fear of their multi-million dollar properties falling into the ocean.

Image courtesy of The Guardian

Could this Coastal Erosion happen to us in South Australia?

Yes, but not to the same extent.

Sydney and the NSW coast in general fronts onto a high energy beach, which is often pounded directly by ocean swell. Much of the coastal development in South Australia is in the two main gulfs, Spencer and St Vincents, and the wave action in these is not as extreme as on an open ocean beach. Other development along the coast is often in semi-enclosed bays.

Also, Sydney and some areas of the NSW coast are more heavily populated, bringing more pressure to bear on building very close to the beach.

The coastline of Adelaide is in St Vincents Gulf and hence is more protected than an ocean beach, but has also generally been well armoured with rock revetment seawalls along much of its length, protecting it from on-going erosion.

Coastal Erosion control in South Australia

However, there are many spots around our coast which are a concern in regards coastal erosion impacting or threatening to destroy development. This is often shacks or groups of shacks built very close to the beach, but can also include infrastructure such as pipelines or roads.

Beach erosion on Yorke Peninsula
Erosion control rock revetment wall.

These images show the pre-treatment beach erosion, then after the installation of an erosion control rock revetment wall. The batter above the wall can now be re-vegetated.

The before and after photos above are typical of rock seawall protection Magryn can design and arrange installation for to protect properties against the erosion threat which may damage or destroy buildings adjacent the beach.

Please don’t hesitate to call us should you be concerned about the safety of your assets.

Magryn often deals with coastal erosion control to protect these assets, and we have designed works to counteract this threat.

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Cowell Marina

June 30, 2020
Filed under: Coastal Engineering — Tags: — Magryn @ 11:59 am

These photos show the current stage of a marine project at the Cowell Marina designed by Magryn Engineering

Currently, the marina basin is being excavated to a suitable depth and constructing breakwaters around it, then rock armouring them.

The marina is sized for about 28 vessels on floating pontoon berths with a wharf area, vessel sewerage pump-out and other services. 

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Whyalla Jetty nearing completion

May 21, 2020
Filed under: Coastal Engineering — Tags: , — Magryn @ 9:29 am

Stunning drone photos of the Whyalla Jetty project nearing completion provided by SA Drone Services

Read more about the Whyalla Jetty Project:

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Port Augusta Heritage Wharf Assessment

November 29, 2019
Filed under: News,Coastal Engineering — Tags: — Magryn @ 3:34 pm

The historical timber main wharf at Pt Augusta was built in 1870 and has seen irregular and adhoc maintenance over the years.

In 2018, Magryn undertook a comprehensive assessment of the whole of the wharf, including timber decking, wharf substructure and timber support piles, both above and below water level.

This assessment showed that the wharf is in poor condition and urgently in need of maintenance and structural repair. A plan was formulated by Magryn to allow this project to be tackled over several years, with the most urgent areas of concern address first.

If these works are carried out it is anticipated that the historical wharf can be retained and used for recreational purposes of the community into the future.

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Construction of Emu Bay Boat ramp

April 12, 2019
Filed under: Coastal Engineering — Magryn @ 2:01 pm

Magryn Engineering have been involved with the Emu Bay Boat ramp, on the northern coast of Kangaroo Island since 1999.

We have undertaken several upgrade designs to the original ramp which unfortunately was very limited and inadequate.

Emu Bay Boat Ramp from the local Jetty

Kangaroo Island Council and Team Civil are now involved in the rebuilding of the ramp to provide a better facility including:

  • A triple lane boat ramp,
  • Two stepped jetties from FRP Construction,
  • Better roadway access
  • Formalised rigging/de-rigging areas,
  • Rock armour protection around the ramp area.

The ramp is located in an exposed location, and floating pontoons were not feasible for this site.

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