WACoast a new information resource for WA coastal managers - PowerPoint PPT Presentation
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Title: WACoast a new information resource for WA coastal managers
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WACoast a new information resource for WA
coastal managers
- Bob Gozzard
- Geological Survey of Western Australia
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Outline of talk
- Extent of the study area
- What do we need to understand?
- Approach used to capture data
- WACoast outputs
- Use of WACoast data
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WACoast extent
- 2008 - 2009
- Lancelin to Cape Naturaliste
- 400 km
- 2009 2010
- Lancelin to Kalbarri
- 400 km
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What do we need to understand?
- Coastal landforms
- Geological control of beaches
- Beach morphology
- Coastal processes at a range of spatial and
temporal scales - Wind and wave climates
- Offshore sediment movement longshore littoral
drift - Sea-level change and its influence on the
shoreline - Anthropogenic influences on the shoreline
groynes, breakwaters, marinas
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Coastal morphology
Rocky coasts ? calcarenite Cliffs and bluffs,
often undercut Rock pavements, platforms, reefs,
beachrock
- Rocky coasts ? gneiss
- Smooth slopes with boulders at base
Mixed sand and rock coasts Cuspate forelands,
tombolos, perched beaches
Sandy coasts Barrier systems, enclosed lagoons,
and beaches
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Approach used tocapture data
- Identify and capture the 198 individual beaches
and intervening rocky coastline - For each beach characterise the tidally-defined
zones in the field - nearshore, proximal foreshore, distal foreshore,
proximal backshore, distal backshore, coastal
exposure, and geological substrate - four context photographs
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Approach used tocapture data
- Oblique aerial photographs
- Create fully attributed Smartline GIS layer
- Map landforms within 3 kmof the coast
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Outputs - GIS
- ArcGIS project
- Beaches and intervening rocky coastline
- SuperSmartline
- Beach characterisation
- Coastal geomorphology
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Outputs - atlas
- Oblique aerial photographs
- Georeferenced
- Interactive map-based
- Overview
- Detailed
- Zoom in and out
- Activate animatedsequence
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Use of WACoast data
- Regional scale coastal management
- Based on the concept of coastal compartments
- These units have responses and behaviours that
must be understood and taken into account - Local scale coastal management
- Based on littoral sediment cells
- Interaction of component geomorphological units
produce a particular response
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Conclusion
- WACoast provides a better understanding of
- The importance of geology and geomorphology in
coastal management - Shoreline stability
- Effects of the interruption of offshore sediment
source - Coastal responses to sea-level change
- Coastal vulnerability
Blackwood River, Augusta
Albany
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- Listen! you hear the grating roar
- Of pebbles which the waves drawback, and fling,
- At their return, up the high strand,
- Begin, and cease, and then again begin
- Matthew Arnold
- Dover Beach
- New Poems (1867)
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