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Narrabeen Lagoon Entrance Study

Client: Research Project, partially funded by Warringah Council
Year: 2005-2008
Publications:

  • Cameron, D. W., Morris, B. D., Collier, L. and Mackenzie, T. (2007) Management and monitoring of an ICOLL entrance clearance. 16th NSW Coastal Conference, Yamba, pp. 16
  • Morris, B. D., Coco, G., Bryan, K. R. and Turner, I. L. (2007) Video-derived mapping of estuarine evolution. Journal of Coastal Research, SI 50, 410-414
  • Morris, B. D. and Turner, I. L. (2007) Rapid infilling of an intermittently open-closed lagoon entrance following mechanical clearance. 18th Australasian Coastal and Ocean Engineering Conference, Melbourne, Australia, pp. 6
  • Morris, B. D. and Turner, I. L. (2008) Morphodynamics of the rapid sedimentation at a coastal lagoon entrance. Marine Geology, (in review)
  • Morris, B. D. and Turner, I. L. (2008) Applicability of inlet stability to small coastal inlets. Journal of Coastal Research, (in preparation)

Narrabeen Lagoon is located approximately 16 km north of Sydney’s CBD, within the Warringah Council Local Government Area. The lagoon covers an area of approximately km2 and the tidally effected part of the estuary has a scale of 100’s of metres. The lagoon entrance is subject to continuous infilling which restricts water exchange between the estuary and the ocean; and in extreme cases closes the lagoon off completely. This in turn effects the entire lagoon system leading to problems with flooding and water quality.

WRL is assisting Warringah Council by providing quantitative and independent monitoring of the entrance to Narrabeen Lagoon, with particular focus on short and long term management strategy plans. An Argus station collects digital video images of the lagoon entrance every daylight hour via four cameras mounted on the roof of North Narrabeen Surf Lifesaving Club. These images are analysed at WRL, and the results are made available on the coastal imaging website.

Concurrent work involving the use of RTK DGPS surveying, in situ hydrodynamic measurements and state of the art numerical modelling is being undertaken to investigate the morphological behaviour of this intermittent tidal lagoon entrance from scientific, engineering and management perspectives.

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