Table 2: Need and benefits of the Western Port embayment and living shoreline themes

Need

Gaps to be filled

Benefits

Example project

Theme 1: Geomorphic Setting

Shoreline and landform characteristics influence vegetation communities, erosion and accretion rates

Appropriate grouping of similar geomorphic units in Western Port Bay

Consideration of geomorphic setting in the smartline dataset

Identification of vegetation types and physical attributes in the smartline dataset

Incorporation of geomorphic information into the smartline data will allow for consistent inputs into modelling and predictions of shoreline changes in the future

Identification of geomorphic units will allow for forward projections of sediment movement

Model morphological changes in the nearshore area using parameters established for each geomorphic unit using open source software (XBeach model)

Link 21

Theme 2: Hydrodynamic drivers

Role of waves is critical in erosion processes

Effects of waves varies with shoreline characteristics

Data for drivers for wave formation such as wind direction and wind speed

Data for surface roughness

Understanding of the interaction between waves, inundation, marsh platform

Improved parameterization of inputs for coastal chance models to predict future impacts

Improved ability to model nearshore environments using open source software (Delft 3D Wave model)

Link 22

Theme 3: Sediment Supply

Transport of sediment is critical to eroding or accreting shorelines

Understanding how the elevation and morphology of the shoreline changes over a range of timescales is important in how sediment is transported

Determining the available accommodation space in an embayment, which is constrained by the catchment and tidal regime, is important affects the area available for wetland migration

Identification of sources and sinks of sediment

Quantification of erosion and accretion rates over different timescales, from seasonal and annual variation so to longer term trends

Understanding how sediment supply influences coastal acid sulphate soil formation

Quantification of surface elevation changes due to limited number of SET sites established in Western Port Bay

Identification of the role of autochthonous sediment contribution to surface elevation changes

Correlation between suspended sediment concentrations determined from remotely-sensed data and nearshore sediment availability and characteristics

Variation and magnitude of changes in the shoreline over the time period when aerial photography has been available

Development of a technique to monitor long term suspended sediment concentration variations using remotely-sensed data

Establishment of additional long-term monitoring sites for surface elevation changes in representative geomorphic units; sediment exchange between the nearshore and intertidal zone monitored under current conditions can be used to determined variations over shorter (seasonal) time frames

Parameterisation of accretion and erosion processes based on geomorphic units for improved accuracy in modelling and scaling

Link 22

Link 23

Theme 4: Citizen Science Monitoring

Engage the community in management, monitoring and research in the coastal zone

Provide additional observation points for change detection in the coastal zone

Event-based data on the shoreline, such as following storm-surge or coastal flooding, is patchy and inconsistent

Variations in the high tide mark in high temporal and spatial resolution is limited

Improved understanding of the height and variability of high tide and proximity to important infrastructure

Improved understanding of variability in tidal cycles vs storm surge events

Establishment of long-term monitoring sites for shoreline profile changes

http://mangrovewatch.org.au/regions/australia/victoria/

Page last updated: 16/12/19