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47. Yaringa - Mangrove Sedimentation

This information has been developed from one or more of these publications:

  • Sites of Geological and Geomorphological Significance in the Westernport Bay Catchment (1984) by Neville Rosengren.
  • Sites of Geological and Geomorphological Significance in the Western Region of Melbourne (1986) by Neville Rosengren
  • Sites of Geological and Geomorphological Significance on the Coast of Port Phillip Bay (1988) by Neville Rosengren.
  • Sites of Environmental Significance in the Flood Plain of the Upper Yarra Valley Region (1983) by Neville Rosengren, Douglas Frood and Kim Lowe (as part of a study of Sites of Environmental Significance by the University of Melbourne for the then Upper Yarra Valley and Dandenong Ranges Authority).
Geological heritage sites, including sites of geomorphological interest and volcanic heritage sites, are under regular revision by the Geological Society of Australia, especially in the assessment of significance and values.Reference should be made to the most recent reports. See the Earth Science Heritage section of the Geological Society of Australia website (external link) for details of geological heritage reports, and a bibliography.


Location:
Tyabb – 465645 to 442612. Coastal area extending from Yaringa boat harbour south to 1.5 kilometres south of Denham Road.
Image: Sites of Significance Westernport Bay
 Intertidal flats, mangrove and salt marsh
south from Yaringa, Site 47

Access:
Iluka Road, Whitneys Road, and Denhams Road.

Ownership:
Crown Land and private land.

Geology/Geomorphology:
The coastline is low and inclines a broad salt marsh zone with mangrove fringe of variable width and continuity. Several studies have attempted to determine the role of mangroves as agents of coastal sedimentation, and monitoring sites have been established near Yaringa and at Denhams Road, (Bird and Barson, 1975; Bird, 1980). South of Denhams Road, the mangrove fringe experienced severe die-back during the re-establishment. In front of the mangroves is a wide and predominantly muddy intertidal flat with poorly developed tidal channels.

Significance:
State. This is a major site for the study of the role of mangroves in coastal sedimentation. The area of the south Dedham Road is of particular significance for the study of the causes and rates of mangrove die-back and regeneration, and the relationship of this to sediment transport and accumulation in the intertidal zone.

Management:
Class 1. Further land reclamation north of Long Point should be prohibited as this will seriously interfere with the value of the site as one for monitoring long-term rates of mangrove sedimentation.

References:
Bird, E.C.F. and Barson, M.M. (1975). Shoreline changes in Westernport Bay. Proc. Roy. Soc. Vict. 87 (1) 15-28.
Bird, J.F. (1981). Geomorphological implications of flood control measures, Lang Lang River, Victoria. Aust. Geog. Stud. 169-183.

47. Yaringa - Mangrove Sedimentation
Site 47, Mangroves and coastal sediments south of Yaringa
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