The hydrogeological systems in the are associated with aeolian sand in the coastal zone of the subregion (companion product 1.1 for the Hunter subregion ()) as illustrated in Figure 22. As discussed in Section 184.108.40.206.3, coastal sands typically support a single, unconsolidated sedimentary aquifer, in which groundwater forms a freshwater lens in the intergranular voids of the coastal sand mass. Estuarine and near-shore marine ecosystems located adjacent to coastal sand masses may also depend on the of from these unconsolidated sedimentary aquifers.
The within the ‘Coastal lakes and estuaries’ landscape group are based on mapping of coastal lakes and estuaries (NSW Department of Environment Climate Change and Water, ), and mapping of saline wetlands (mangroves and saltmarshes) and seagrasses (NSW Department of Primary Industries, Dataset 2). For estuaries and lakes, the assessment team adopted the classification scheme used by the NSW Department of Environment and Heritage (), which classifies estuaries and lakes into ‘Drowned valleys’, ‘Lakes’, ‘Barrier river’, ‘Lagoons’, and ‘Creeks’ based on dilution factors, tidal flushing times and geomorphology. Coastal lake and estuary landscape classes within the that are most likely to be associated with coastal aquifers are ‘Lakes’, ‘Lagoons’, ‘Saline wetlands’ and ‘Seagrass’. Groundwater-dependent ecosystem (GDE) landscape classes that could be associated with coastal aquifers (e.g. ‘Forested wetland’) are covered in Section 2.7.4. ‘Lakes’, ‘Lagoons’ and ‘Saline wetlands’ landscape classes are represented by the qualitative model for intertidal wetlands (Section 220.127.116.11); the ‘Seagrass’ landscape class is represented in the qualitative model for subtidal benthos (Section 18.104.22.168), but can be linked to the intertidal wetlands model via the seagrass node in the intertidal wetlands model. Thus, the two qualitative models describe a continuum across the land–water interface, reflecting the changes in communities with variations in degree of submergence from partial and intermittent to complete and permanent.
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- 2.7.1 Methods
- 2.7.2 Prioritising landscape classes for receptor impact modelling
- 2.7.3 'Riverine' landscape group
- 2.7.4 'Groundwater-dependent ecosystem' landscape group
- 2.7.5 'Coastal lakes and estuaries' landscape group
- 2.7.6 Limitations and gaps
- Contributors to the Technical Programme
- About this technical product