IHD Engineering Awards submission - Fremantle Ports

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Inner H 9m 11m 13m 14.7m Factsheet: january 2010 silt screens and Air Curtain - old Fremantle Ports is installing silt screens and an air curtain at the Old Fremantle Traffic Bridge as part of the Inner Harbour Deepening project. The silt screens and the air curtain are being trialled to see how effective they are in limiting dredging plumes from extending up the Swan River. Air Curtain An air curtain (sometimes referred to as a bubble curtain) helps prevent material (such as oil, debris or sediment) spreading in the water. A current is generated by compressed air flowing through a thick walled pipe placed on the seabed. The air escapes through nozzles incorporated into the pipe and rises to the surface, forming a vertical current in the vertica which The ai section only b Harbo When traffic. at Frem The en the dr insignifi the po the im manag For one tenant, maintaining water quality in Rous Head Harbour was of paramount importance as this was the source of water for live lobster tanks. Fremantle Ports deployed an air bubble curtain at the entrance to Rous Head Harbour to reduce dredge plumes. This was effective in preventing dredge plumes from reaching the tenant’s water intake pipes.
FREMANTLE PORTS Optional Judging Criteria Criteria 16: Environmental implications The environmental assessment for the project involved definition of the existing local environment and rigorous analysis of any potential impacts. The environmental factors assessed included: • marine biodiversity, habitats and fauna • water and sediment quality • introduced marine pests • coastal processes • acid sulphate soils • noise, traffic and dust impacts • hydrocarbon spills • indigenous heritage • public access and recreation. Detailed studies included: • hydrodynamic modelling • marine habitat mapping • extensive sampling and testing of sediments • baseline water quality monitoring • beach modelling to assess impacts on local coastal processes. The environmental assessment has led to improved understanding of the marine environment offshore from Fremantle and the impacts of a major dredging program on public amenity and ecosystem health. Preventative and management measures were applied to ensure environmental impacts were avoided or minimised. Independent monitoring of water and sediment quality and seagrass, coral and biota (mussel) health was undertaken before, during and after the dredging. In addition, aerial surveys of the extent of any plumes were undertaken three times each week. The water quality monitoring program was conducted at more than 30 sites offshore from Fremantle and in the Swan River and was additional to the routine monitoring that the Department of Water and Fremantle Ports regularly undertake in the Swan River. Monitoring results were reported to the Office of the EPA, Department of Health and Swan River Trust weekly throughout the dredging activities and posted on Fremantle Ports’ website. General findings of the extensive water quality monitoring and environmental monitoring program demonstrated that environmental impacts were less marked than predicted and confirmed that the project did not present public health issues or unacceptable impacts on the marine environment. Dust and noise management Onshore works also had the potential to impact on the environment and neighbours through dust and noise from construction activities. 2011 Engineering Excellence Awards l Infrastructure and Building Category l Page 23
Page 1 and 2: Inner Harbour Deepening, Rous Head
Page 3 and 4: FREMANTLE PORTS Executive Summary T
Page 5: FREMANTLE PORTS Mandatory Judging C
Page 8 and 9: Safety of diving teams and the mari
Page 10 and 11: Mandatory Judging Criteria Criteria
Page 12 and 13: Also unique to the project was the
Page 14 and 15: Value adding, export potential As a
Page 20 and 21: Optional Judging Criteria Criteria
Page 24 and 25: In the construction of the seawall
Page 26 and 27: Optional Judging Criteria Criteria
Page 28 and 29: Inner Harbour Deepening and Berth W
Page 30 and 31: Background Fremantle Ports Dredg
Page 32 and 33: Dissemination of the results Di
Page 34: Minister for Environment. It is

IHD Engineering Awards submission - Fremantle Ports

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