- Title
- Characterising Continental Shelf Waves and Their Drivers for the New South Wales coast in Australia
- Creator
- Viola, Cristina; Verdon-Kidd, Danielle C.; Power, Hannah e.
- Relation
- Australasian Coasts and Ports 2023 Conference. Proceedings of the Australasian Coasts and Ports 2023 Conference (Sunshine Coast, QLD 15-18 August, 2023) p. 11-17
- Relation
- https://search.informit.org/doi/epdf/10.3316/informit.472651228152943
- Publisher
- Engineers Australia
- Resource Type
- conference paper
- Date
- 2023
- Description
- New South Wales (NSW) low-lying areas often experience extended periods of inundation, which are not attributed to astronomic and non-astronomic forcing conditions. This inundation can be a result of relatively small tidal residuals, which, if persistent enough, can damage the built environment. One of the causal mechanisms of the prolonged inundation are continental shelf waves (CSWs), owing to their long period. CSWs are generated by synoptic disturbances, including wind stress and pressure gradient along midlatitudes, and they travel anticlockwise along the coast, reaching low latitudes of NSW. This study investigates the characteristics of CSWs that travel along the NSW coast, their generation and propagation mechanisms in relation to local synoptic conditions, and their potential modulation by two major large-scale climate modes: the El Nino/Southern Oscillation and the Southern Annular Mode. Sub-daily time series of tidal residuals from nine locations along the NSW coast were subjected to a peak-over-threshold analysis to identify 29 waves with an average amplitude of 0.3 m and a mean period of 15 days (ranging from 8 to 20 days). Our findings confirmed that large-scale atmospheric circulation is a key element in generating and propagating CSWs, with higher occurrence in Autumn and Winter. We also found that CSWs are more frequent during the positive phase of SAM combined with La Nina and during El Nino events when SAM was neutral. This study provides the longest database to date of CSWs for NSW, alongside new insights into their characteristics that can be used to monitor their occurrence and forecast their impact in NSW coasts and estuaries
- Subject
- long-period waves; synoptic events; seasonal scale; multimodal impact
- Identifier
- http://hdl.handle.net/1959.13/1502304
- Identifier
- uon:55208
- Identifier
- ISBN:9781925627800
- Language
- eng
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