The discipline of coastal and marine engineering has been a key pillar at Magryn & Associates since inception and, today, we enjoy a strong professional relationship with councils, government departments and the private sector around the country, delivering on projects such as:
Boat ramps and boat launching facilities for recreational and commercial vessels, where we conceptualise facilities on the coast and in rivers and estuaries and attend to the detailed design documentation. The designs generally comply with SABFAC guidelines to enable clients to apply for funding grants from the SA Government.
Rock seawalls for the protection of coastline and structures from erosion and/or wave attack.
Breakwater design, a service often incorporated into the design for boat ramps or marinas.
Jetty design for recreational or commercial use, employing either epoxy paint treated steel or composite or recycled plastics. Furthermore, the design may incorporate a fender design to allow vessels, from small fishing boats to large bulk carries of 100,000 DWT or more, to berth.
Structure inspection and reporting, that involves above and below the water line inspections of marine structures, assessment of condition and reporting, which may include recommended remedial works. Underwater inspection is either undertaken by free diving or by professional dive teams using hookah.
Coastal erosion and flooding assessment of coastal sites is undertaken to determine:
- historical erosion
- ongoing coastal erosion
- susceptibility for flooding due to elevated water levels from:
- rising sea level
- storm surge
- wave effects
The subsequent reports may include:
- recommendation of coastal erosion buffer zones
- design of coastal protection against erosion
- specification of building levels to avoid flooding
Coastal process investigation involves the analysis of the coastal environment for effects such as sand transport, currents, erosion and accretion of beaches and usually employs one of more of the following:
- hydrographic survey
- sediment sampling
- current measurement
- aerial photography, both historical and current
- wave measurement
These investigations may be undertaken, for example, to determine the effects a new industrial or residential development will have on a stretch of coastline.
Marina design, undertaken in accordance with the Australian Standard AS3962, covers both the conceptual and detailed design phases for boat mooring at coastal locations and takes into account:
- depth of water and the need for dredging
- wave climate and penetration
- pontoon design
- vehicle access and parking
- boat launching
- other effects, such as seaweed ingress and adjacent erosion
Offshore structures may include offshore navigation aides to shipping, pipe outfalls or intakes or vessel anchor systems. Designed to handle the required applied loads and local environmental conditions, the designs comply with Australian Standard AS4997 and other relevant standards.
Hydrographic surveys, which are underwater surveys of the seabed and are often undertaken in conjunction with a land survey on the shore. Magryn & Associates brings a wealth of experience to the marine survey discipline, with a licenced surveyor and a purpose-modified jet-ski on hand to tackle all required seabed surveys.
Marine investigations are required for particular aspects of coastal projects. The Magryn team has extensive experience across:
- marine sediment sampling
- salinity measurement
- ocean temperature measurement’
- side scan sonar investigation of the seabed and profiling
Design of stormwater outfalls on beaches is a particularly complicated field thanks largely to:
- varying ocean water levels
- sand transport along the coast
- wave attack and erosion onto the outfall structure
- erosion of sand by water exiting from the outfall
- trapping of gross pollutants from the outfall
- prevention of vermin access to outfall pipework
Design of vessel waste pump-out stations on the coast and in riverine systems is another of our specialities and ensures that the pumping out and storage or disposal of waste from a vessel is carried out in an environmentally acceptable manner. The design of these stations includes:
- jetty structure design
- pump selection
- storage/disposal selection