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Tropical Cyclone Impacts on Headland Protected Bay

1
Global-Change Ecology Research Group, School of Science and Engineering, University of the Sunshine Coast, Sippy Downs, QLD 4556, Australia
2
Noosa Council, Tewantin, QLD 4565, Australia
3
BMT, Brisbane, QLD 4001, Australia
*
Author to whom correspondence should be addressed.
Geosciences 2020, 10(5), 190; https://doi.org/10.3390/geosciences10050190
Received: 17 April 2020 / Revised: 1 May 2020 / Accepted: 15 May 2020 / Published: 19 May 2020
(This article belongs to the Special Issue Coastal Morphodynamics and Geomorphology)
The response of headland protected beaches to storm events is complex and strongly site dependent. In this study, we investigated the response of several headland protected beaches in Noosa, Australia to a tropical cyclone event. Pre and post topographical surveys of all beaches were completed using both pole-mounted RTK-GNSS and structure-from-motion (SfM)-derived elevation models from survey-grade drone imagery to assess sediment volume differentials. Coastal imaging was used to assess shoreline development and identify coastal features while a nearshore wave model (SWAN) was used to project waves into the study site from a regional wave buoy. Obliquely orientated swells drive currents along the headland with sediment being eroded from exposed sites and deposited at a protected site. Elevated sea-levels were shown to be a strong force-multiplier for relatively small significant wave heights, with 10,000 m3 of sediment eroded from a 700 m long beach in 36 h. The SWAN model was adequately calibrated for significant wave height, but refraction of swell around the headland was under-represented by an average of 16.48 degrees. This research has coastal management implications for beaches where development restricts natural shoreline retreat and elevated sea states are likely to become more common. View Full-Text
Keywords: coastal monitoring; cyclone impacts; headland bypassing; RTK drone; SWAN coastal monitoring; cyclone impacts; headland bypassing; RTK drone; SWAN
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MDPI and ACS Style

Wishaw, D.; Leon, J.X.; Barnes, M.; Fairweather, H. Tropical Cyclone Impacts on Headland Protected Bay. Geosciences 2020, 10, 190. https://doi.org/10.3390/geosciences10050190

AMA Style

Wishaw D, Leon JX, Barnes M, Fairweather H. Tropical Cyclone Impacts on Headland Protected Bay. Geosciences. 2020; 10(5):190. https://doi.org/10.3390/geosciences10050190

Chicago/Turabian Style

Wishaw, Daniel, Javier X. Leon, Matthew Barnes, and Helen Fairweather. 2020. "Tropical Cyclone Impacts on Headland Protected Bay" Geosciences 10, no. 5: 190. https://doi.org/10.3390/geosciences10050190

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