This section of coast is vulnerable to inundation. Longshore transport of material from south to north appears to be maintaining that width and elevation of the beaches, which will aid in reducing the inundation risk. Much of the shoreline is backed by areas of foreshore reserve which provides a buffer. Behind this is the road, which is likely to be impacted in future as sea-levels rise.
Salt Lagoon is a very low-lying area. The strip of foreshore separating the Lagoon and nearby beachfront properties from the bay is narrow. Under a present day 1% AEP inundation event (0.0 m SLR), the foreshore and road (The Esplanade) is likely to be overwashed leading to inundation of the hinterland. Under higher events (i.e. 1% AEP events with more than 0.2 m SLR) almost the entire shoreline is low enough to be overwashed.
Note, the inundation extents shown are the maximum possible based on topography and the storm-tide level under each scenario, and do not consider spreading and absorption.
Management triggers are presented in Table 6-13.
Table 6-13 Management triggers – St Leonards to Indented Head
| Hazard | Mechanism | Estimated scenario under which this is likely to occur | Triggers |
|---|---|---|---|
| Inundation (Lake Reserve) | Overwashing of the shoreline due to storm-tide inundation + sea-level rise | 1% AEP event + 1.1 m SLR | A) Investigation and planning / management when measured increases in sea-level reach 0.5 m above present day levels and/or if significant erosion occurs lowering current foreshore levels. |
| Inundation (Salt Lagoon) | Overwashing of the shoreline and breaching of low protection structures due to storm-tide inundation + sea-level rise | 1% AEP event + 0.0 m SLR | A) Investigation and planning / management action required immediately. The shore protection fronting the road at Salt Lagoon is low and in poor condition. Breaching in this area is likely under a 1% AEP event. |
Results
Indented Head to Portarlington
