For the area shoreline, only significant shore protection structures have been considered. The elevations of the structures are low, however, and are of no consequence to the inundation assessment. The inundation hazard is quite significant in this location.
The erosion and inundation hazards have been treated separately in this area, although the two are significantly linked and will also be linked to tide level increases with sea-level rise. This should be considered in subsequent risk assessments. Additional figures have been produced that show the mean high high water (MHHW) mark for the present day and including sea-level rise, which infers a possible shoreline position with no management intervention and no accelerated erosion. This shows that the future MHHW tidal levels with sea-level rise will advance well inland (Figure 6-28 and Figure 6-29).
Management triggers are presented in Table 6-14.
Table 6-14 Management triggers - Indented Head to Portarlington
| Hazard | Mechanism | Estimated scenario under which this is likely to occur | Triggers |
|---|---|---|---|
| Inundation -The Esplanade | Overwashing of the shoreline and low protection structures due to storm-tide inundation + sea-level rise | 1% AEP event + 0.5 m SLR | A) Investigation and planning / management when measured increases in sea-level reach 0.2 m above present day levels and/or if significant erosion occurs lowering current foreshore levels (identified through monitoring). |
| Inundation -Ramblers Rd | Overwashing of the shoreline due to storm-tide inundation + sea-level rise | 1% AEP event + 0.0 m SLR | 1) Investigation and planning / management action required immediately. Breaching and inundation in this area is likely under a 1% AEP event for the present day. |
Implications for Coastal Management
Further investigations
