Mangrove Cove

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Delta Mangrove Cove Management Plan The reclamation materials appear to come from a variety of sources. Digging on the site reveals large amounts of ‘kunkar,’ the calcrete material that underlies the St Kilda formation in the Port Adelaide area. Whenever portions of the Port needed deepening, this layer had to be removed. It is possible that some of the ‘kunkar’ material on the site came from the excavation of West Lakes that occurred in 1974. Other materials include bricks, concrete, asbestos (Messenger, 25/3/86) and slags of unknown origin. The boat ramp that slopes down from the filled area to the natural surface has slag of unknown origin exposed along its eastern edge, and is topped by a thick layer of ‘limestone grits’ that were probably sourced from the Soda Ash Plant at Osborne. Coastal acid sulfate soils (ASS) are formed during and after periods of seawater inundation, such as occurred in the Adelaide region during the Flandrian Transgression. These soils are quite stable while they remain inundated, and are usually referred to as PASS (potential acid sulfate soils). PASS soils convert to actual ASS after they are drained. The mudflats, saltmarsh and mangroves all occur on intertidal soils likely to be classified as PASS. While these areas remain undisturbed and subject to daily tidal inundation, these potential acid sulfate soils are unlikely to become actual ASS. The management objective is to minimise any further degradation of the site and attempt remedial actions where possible. Strategies: • Disturbance to the soils of the intertidal areas shall be minimised. • Should any actions that could disturb areas of coastal acid sulfate soils be contemplated, an impact mitigation plan shall be developed in cooperation with the Coastal Protection Branch of DEH. • The preferred treatment for the boat ramp area is revegetation, maintaining biodiversity and improving amenity. The details relating to the methods and practical completion of the project will be negotiated between the PAE Council and Newport Quays, outside this management plan. 5.2.2 Hydrology Mangrove Cove historically contained a small creekline that reached the Port River in the Cove. This creekline was part of the estuary, and early records relate that the land drained by the creek was swampy and subject to the tides. The salinity of the creek would therefore have been quite variable, as one would expect in an estuary. In summer, high evaporation combined with the tidal inundation would have resulted in periods of hypersalinity. In winter, the swamp discharge may have been brackish. The creek has been redirected from the Cove, indeed its original course is buried under Rennie Road and the reserve now receives only the freshwater that falls on it. The ‘creek’ that has developed in the Cove appears to be a drainage line that has formed in the lowest remaining area of the Cove and that allows the daily draining of tidal waters. This creek may become more defined over time as mangroves become dense on either side of it. Groundwater around the Barker Inlet and under Port Adelaide occurs as a series of shallow quaternary aquifers, some of which are located just below the natural surface. Salinity in these LMC-MCR-001-PC/RE Page 19
Delta Mangrove Cove Management Plan surficial aquifers is very high (often around twice the salinity of seawater) and the water table moves up and down in response to tidal cycles (Pavelic and Dillon 1993). The presence of this saline groundwater may impact on plants growing on the filled area, particularly if the fill material has a porous nature. Shallow rooted plants, or plants with a tolerance to occasional salt inundation will tolerate the changes in the water table, which are most noticeable during the highest winter tides. Management objectives include revegetating the filled areas with plants appropriate for the hydrological constraints of the site. Strategy: • Observe successful plant species and use these for the majority of plantings. 5.2.3 Flora and fauna communities The flora and fauna communities present within Mangrove Cove are an important and significant part of the local ecosystem. The site contains areas of mangrove, saltmarsh and fill that are being revegetated by community groups with indigenous dune plants. While small, the area forms a significant patch of native vegetation in the district. Figure 8 - Flora sampling locations LMC-MCR-001-PC/RE Page 20
Page 2 and 3: Mangrove Cove Management Plan Peri
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Page 52 and 53: Appendices Aims and strategies tabl
Page 54 and 55: MANAGEMENT ISSUE Cultural values Th
Page 56 and 57: Flora collection permit
Page 58 and 59: Additional Condtions: GENERAL FLORA
Page 60 and 61: Mangrove Cove field data Permit: A2
Page 66 and 67: the Tandanja ruwe by way of Medaind
Page 68 and 69: (Phalacrocorax carbo) totem at the
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Janaleitj? (How far away?) Nitj tei
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Delta Mangrove Cove Management Plan
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FITZJAMES - possibly Jervois Basin
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FIDES - Jervois Basin The four-mast
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UNIDENTIFIED WOODEN PONTOON - Jervo
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Remediating seagrass beds The origi
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Prior to attempting any remediation
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Active management of mangrove expan
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only slowly diffuse away. The chang
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Preliminary suggestions for constru
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The area flooded only every few day
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Mangrove Park Management Plan This
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Cultural Kaurna significance • Th
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Mangrove Cove

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