Tropical Cyclone-Driven Sediment Dynamics Over the Australian North West Shelf

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Dufois, Francois; Lowe, Ryan; Branson, Paul ORCID ID icon; Fearns, Peter


2017-12-29


Journal Article


Journal of Geophysical Research-Oceans


122


12


10225-10244


20


Owing to their strong forcing at the air-sea interface, tropical cyclones are a major driver of hydrodynamics and sediment dynamics of continental shelves, strongly impacting marine habitats and offshore industries. Despite the North West Shelf of Australia being one of the most frequently impacted tropical cyclone regions worldwide, there is limited knowledge of how tropical cyclones influence the sediment dynamics of this shelf region, including the significance of these episodic extreme events to the normal background conditions that occur. Using an extensive 2 year data set of the in situ sediment dynamics and 14 yearlong calibrated satellite ocean-color data set, we demonstrate that alongshore propagating cyclones are responsible for simultaneously generating both strong wave-induced sediment resuspension events and significant southwestward subtidal currents. Over the 2 year study period, two particular cyclones (Iggy and Narelle) dominated the sediment fluxes resulting in a residual southwestward sediment transport over the southern part of the shelf. By analyzing results from a long-term (37 year) wind and wave hindcast, our results suggest that at least 16 tropical cyclones had a strong potential to contribute to that southwestward sediment pathway in a similar way to Iggy and Narelle.


American Geophysical Union


Marine Geoscience


https://doi.org/10.1002/2017JC013518


Link to Publisher's Version


Funding Body NameProject/Grant ID
Western Australian Marine Science Institution


EP181565


Journal article - Refereed


English


Dufois, Francois; Lowe, Ryan; Branson, Paul; Fearns, Peter. Tropical Cyclone-Driven Sediment Dynamics Over the Australian North West Shelf. Journal of Geophysical Research-Oceans. 2017; 122(12 10225-10244):20.https://doi.org/10.1002/2017JC013518



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