Victorian Coastal Cliff Assessment - Cliff Face Landslip Areas (ASTaR) - Present day - 0.0m SLR

dataset: ASTAR_PRESENT_DAY_00MSLR
The Victorian Coastal Cliff Assessment - Instability Areas (ASCCIE) 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. ASTaR have been derived based on the geological unit type and cliff height. The methodology for defining ASTaR is a new method undertaken at a high level and based on the existing cliff height and a defined slope to identify the possible seaward extent of talus runout. For this state-wide/regional scale assessment, single values were derived for each component. This ‘building-block’ approach (ie: a combination of individual parameters) is expected to produce ‘upper bound’, conservative results, which identifies areas potentially exposed to coastal erosion, cliff instability and cliff slumping/talus The product is an update to the Victorian Coastal Cliff Assessment, Stage 1. Included datasets for Stage 2a supersede the Stage 1 outputs. The Stage 2a project report should be read in conjunction with the Stage 1 report. Application of the data should be guided by the accompanying "Victorian Coastal Cliff Assessment, Stage 2a technical report" (Tonkin & Taylor 2025) read in conjunction with the Stage 1 technical report, combined with appropriate expert advice.
 
Citation proposal Citation proposal

(2026)

Victorian Coastal Cliff Assessment - Cliff Face Landslip Areas (ASTaR) - Present day - 0.0m SLR

Department of Energy, Environment and Climate Action

Description

Title
Victorian Coastal Cliff Assessment - Cliff Face Landslip Areas (ASTaR) - Present day - 0.0m SLR 
Alternate title
ASTAR_PRESENT_DAY_00MSLR 
Purpose
Planning at regional / state-wide scale 
 
 

Spatial

Horizontal Accuracy
10m 
 
 

Maintenance

Maintenance and update frequency
As needed 
 
 

Format

Title
File geodatabase, shapefile 
 
 

Contacts

  Point of contact

Cited responsible party

No information provided.
 
 

Keywords

Topic category
  • Environment
 
 

Resource Constraints

Classification
Unclassified 
 
 

Lineage

Statement
Areas Susceptible to Talus Runout (ASTaR) Across the Victoria region, several large-scale landslips have been associated with the soft rock cliff materials. Further to this, there has been a recent fatality due to one of these events. Consequentially, as part of this assessment, ASTaR at the base of the cliffs have been assessed. A review of a limited number of areas was undertaken, which identified that the talus runout can extend as far out from the toe of the cliff as the height of the cliff (a relationship between talus runout and cliff height of 1:1). Based on the above, a 45° angle has been adopted to be projected from the cliff crest seaward along the profile. Mapping of the ASCCIE or ASTaR inherently introduces errors due to the mapping method and resolution. For this assessment transects at 30 m alongshore intervals have been used, with straight lines interpolating between output points. This could result in jiggered lines when zooming in too close. Furthermore, the mapping tool does not always accurately identify the cliff toe and cliff crest as a result of cliff profile/geometry. This is particularly evident for non-cliffs or very gentle slopes. Some manual edits have been made interpolating between adjacent transects using engineering judgement. A LiDAR survey of the Victoria region was undertaken between 2006 and 2009 by the Department of Sustainability and Environment and provides full coverage of the entire Victorian coastline. This LiDAR was processed into a Digital Elevation Model (DEM) surface and has a grid resolution of 2.5 m x 2.5 m. In addition to the 2006-2009 LiDAR, there is more recent higher resolution LiDAR coverage of localised areas within Victoria. These additional data sets are as follows: • Victorian Coastal LiDAR Level 3 Classification (Port Phillip Bay & Western Port and East & West Victoria). This dataset consists of a reprocessed DEM from the original 2006-2007 LiDAR data. • 2017-2018 Greater Melbourne LiDAR. This dataset consists of 1m DTM (Digital Terrain Model) of 12,000 km2 of coast across the Greater Melbourne region. • 2019-2020 Great Ocean Road Elevation and Photography. This dataset consists of a 0.5m grid resolution DEM. • 2020-2021 Bayside Yarra LiDAR. This dataset consists of a DEM with data captured at 24 pts/m2. All of these LiDAR datasets were used in combination for the entire cliffed shoreline, with the highest resolution and most recent LiDAR data being used for each location. Figure 3.2 shows the LiDAR dataset extents that have been used for this study. 3.1.2 Coastal transects In addition to the LiDAR DEMs and DTMs described above, coastal transects were provided by DEECA for the full length of the Victorian coast. These transects are 400 m long and spaced at 30 m increments along the shoreline (see example of transects in Figure 3.1). For this project some transects (e.g. at very high cliffs) have been extended to capture the entire cliff profile. Further information in the study report "Victorian Coastal Cliff Assessment", Tonkin and Taylor, Sep 2023 
Description
Modelled dataset based on Lidar data, coastal transects and modelled coastal water / tidal levels 
 
 

Metadata Constraints Metadata Constraints

Use limitation
Unknown 
Classification
Unclassified 
 
 

Quality

Attribute Quality
Positional Accuracy
Comments
10m 
 
Conceptual Consistency
Missing Data
Excess Data
 
 


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