Cliff Instability Areas (ASCCIE) - 2100 - 1.4m SLR

The ASCCIE_2100_1_4mSLR dataset is a digital dataset consisting of multiple spatial layer outputs from modelled erosion scenarios. The dataset is recommended for use at the statewide / regional scale along the Victorian coastline. Application of the data should be guided by the accompanying Victorian Coastal Cliff Assessment technical reports and expert advice. The product is not suitable for individual property scale assessments. Further information is contained in the study report "Victorian Coastal Cliff Assessment", Tonkin and Taylor, Sep 2023.Consolidated shorelines, which include soil and rock cliffs, are not able to rebuild following periods oferosion but rather are subject to a one-way process of degradation. ASCCIEs typically have two components:• Toe ErosionA gradual retreat of the cliff toe caused by weathering, marine and bio-erosion processes. Thisretreat will be affected by global process such as sea level rise and potentially increased soilmoisture. Future cliff toe position based on historical erosion rates with a factor applied toallow for the effect of future sea level rise.• Cliff InstabilityEpisodic instability events are predominately due to a change in loading or material propertiesof the cliff or yielding along a geological structure. In soft cliffs, instability causes the cliff slopeto flatten to a slope under which it is “stable” (geo-mechanically). Soil cliff slope instabilitiesare influenced by processes that erode and destabilise the cliff toe, including marineprocesses, weathering and biological erosion or change the stress within the cliff slope. Mostof the hard cliffs are stable at very steep angles. Instability events may range from small-scaleinstabilities (block or rock falls) or discontinuities, to cliff slope instability cause by large-scaleand deep-seated mass movement. The latter mode of failure in hard cliffs is rare.