Foredune biogeomorphology in southeast Australia

Area of Science:

• Coastal geomorphology
• Plant ecology
• Biogeomorphology

Background:

• Foredunes provide natural coastal defense, with vegetation critically shaping their form.
• Southeastern Australian coasts exhibit diverse foredune environments and vegetation gradients.

Purpose of the Study:

• To investigate the biophysical interactions between dune vegetation and foredune morphology in New South Wales.
• To identify relationships between plant species composition and foredune shape.
• To explore latitudinal variations in these interactions.

Main Methods:

• Airborne LiDAR and in situ field surveys were employed.
• Analysis of foredune morphometrics (width, height, volume) and vegetation composition at 45 sites.
• Identification of distinct foredune morphological types and associated vegetation assemblages.

Main Results:

• Seven distinct foredune morphological shapes were identified along the New South Wales coast.
• Clear relationships exist between foredune morphology and vegetation composition.
• Specific vegetation assemblages are associated with particular foredune shapes, indicating vegetation-landform interplay.

Conclusions:

• Vegetation composition is a key determinant of foredune morphology.
• Understanding these interactions enhances coastal dune resilience and management strategies.
• Insights support tailored approaches for dune management, modeling, and conservation in southeastern Australia.