Cockburn Sound Management Council Office: Shop 1/15 Railway Terrace Rockingham Beach WA 6168 Postal: PO Box 5161 Rockingham Beach WA 6969 Telephone: +61-8-9591 3837 Mobile: 040 999 3837 Facsimile: +61-8-9528 5387 Email: csmc@dec.wa.gov.au
The Mangles Bay (Causeway) Study
During the information collection period for the Cockburn Sound Environmental Management Plan (EMP), it was identified that further research and investigation was needed on the nature of water circulation in Mangles Bay, in particular the influence of the Garden Island Causeway on the environmental values of the southern end of Cockburn Sound.
The Cockburn Sound Management Council (CSMC) has since undertaken the Mangles Bay (Causeway) Study, an in depth modelling study to examine the impacts of the existing Causeway on the following:
Oceanic flushing and water quality.
Marine communities, including seagrass meadows and rocky reef communities.
Coastal processes, such as shoreline erosion and accretion in Cockburn Sound.
The study also assessed the potential environmental benefits of modifying the existing Causeway design by either widening and/or adding additional openings, or removing the Causeway completely.
Flushing patterns in Southern Cockburn sound (Summer time). With the Causeway present (left) and the Causeway removed (right)
The Mangles Bay (Causeway) study is now complete and includes the following reports and information:
The Full Report
This report presents the findings of detailed surveys which were undertaken to: Accurately map the benthic coverage and assemblages of the Eastern Shelf, Cockburn Sound for summer 2004, using sidescan sonar and extensive groundtruthing.
The Community Summary Paper
CSMC commissioned DAL Science and Engineering (DALSE) to undertake a groundtruthing survey of the Sound's eastern margin.
The Community summary paper
Influence of the Garden Island Causeway on Mangles Bay, Cockburn Sound Environmental & social considerations for modification or
removal of the Causeway.
The Data report
Field Measurements of Current Flows through the Causeway and Mangles Bay
The Full report
The Influence of the Garden Island Causeway on the Environmental Values of the Southern End of Cockburn Sound
