50 years of beach–foredune change on the southeastern coast of Australia: Bengello Beach, Moruya, NSW, 1972–2022

McLean, Roger; Thom, B. G.; Shen, Jia-Shu; Oliver, Thomas S.N.

doi:10.1016/j.geomorph.2023.108850

Cited by 10 publications

(4 citation statements)

References 55 publications

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“…In contrast to the conclusions reported in [22], a recent analysis of the observed behavior of Australian beach systems concludes that many have been stable for several decades and may not be threatened by climate change [52]. From a notable recent analysis of a 50-year time series of monthly beach surveys of a high-energy beach system on Australia's New South Wales Coast [53], it was concluded that while there has been no long-term net coastal recession, beach fluctuations that occur reflect patterns of storminess and the capacity of the beach to recover in post-storm periods. Consistent with these Australian studies, a recent analysis of global trends in changing wave intensity and related shoreline behavior [54] reports that "Over the past 30 + years, we show that there have been clear changes in waves and storm surge at global scale.…”

Section: Coastal Erosion and Shoreline Transgressionmentioning

confidence: 93%

“…On sandy coasts such as that of Southeastern Australia, the continental shelf is both the source and the sink for the barrier sands. As explained in the previous subsection, multiple studies of shoreline behavior in Southeast Australia [52,53] and elsewhere [55] suggest that despite rising sea levels and increasing wave energy, there is no compelling evidence of sandy shores undergoing a net recession. Following the arguments presented by [43], it may be reasonably hypothesized that the more energetic waves are effectively transporting sands shoreward from mid-and outer shelf deposits.…”

Section: Continental Shelf Processesmentioning

confidence: 99%

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Coastal Morphodynamics and Climate Change: A Review of Recent Advances

Wright,

Thom

2023

JMSE

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The shape of the coast and the processes that mold it change together as a complex system. There is constant feedback among the multiple components of the system, and when climate changes, all facets of the system change. Abrupt shifts to different states can also take place when certain tipping points are crossed. The coupling of rapid warming in the Arctic with melting sea ice is one example of positive feedback. Climate changes, particularly rising sea temperatures, are causing an increasing frequency of tropical storms and “compound events” such as storm surges combined with torrential rains. These events are superimposed on progressive rises in relative sea level and are anticipated to push many coastal morphodynamic systems to tipping points beyond which return to preexisting conditions is unlikely. Complex systems modeling results and long-term sets of observations from diverse cases help to anticipate future coastal threats. Innovative engineering solutions are needed to adapt to changes in coastal landscapes and environmental risks. New understandings of cascading climate-change-related physical, ecological, socioeconomic effects, and multi-faceted morphodynamic systems are continually contributing to the imperative search for resilience. Recent contributions, summarized here, are based on theory, observations, numerically modeled results, regional case studies, and global projections.

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Section: Coastal Erosion and Shoreline Transgressionmentioning

confidence: 93%

Section: Continental Shelf Processesmentioning

confidence: 99%

Coastal Morphodynamics and Climate Change: A Review of Recent Advances

Wright,

Thom

2023

JMSE

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“…For example, a brief 5-week deployment at Gerroa supported a coastal process study there 27 , while 12-month and 16-month deployments at Figure Eight Pools and Stockton Beach were intended to establish the relationship between offshore and nearshore wave conditions for hazard investigations 28 , 29 (Tables 1 , 2 ). The longest deployments are adjacent to multi-decadal beach survey datasets at Moruya (Bengello) Beach 18 and Collaroy-Narrabeen Beach 19 and are ongoing. Deployments are visited for servicing at regular intervals (e.g., 5 weeks for Datawell buoys and 4-6 months for Spotter buoys) to remove biofouling or replace the wave buoy and mooring with fresh equipment, and to retrieve onboard recorded data.…”

Section: Methodsmentioning

confidence: 99%

“…The wave buoy data will also interest researchers and applied engineers studying coastal processes, dynamics and hazards. Nearshore wave buoy deployments adjacent to multi-decadal coastal monitoring sites at Moruya (Bengello) Beach 18 and Collaroy-Narrabeen Beach 19 (Fig. 1 ) are ongoing, and together, provide community testbeds for international coastal modelling studies 20 – 22 .…”

Section: Background and Summarymentioning

confidence: 99%

Nearshore wave buoy data from southeastern Australia for coastal research and management

Kinsela,

Morris,

Ingleton

et al. 2024

Sci Data

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Wind wave observations in shallow coastal waters are essential for calibrating, validating, and improving numerical wave models to predict sediment transport, shoreline change, and coastal hazards such as beach erosion and oceanic inundation. Although ocean buoys and satellites provide near-global coverage of deep-water wave conditions, shallow-water wave observations remain sparse and often inaccessible. Nearshore wave conditions may vary considerably alongshore due to coastline orientation and shape, bathymetry and islands. We present a growing dataset of in-situ wave buoy observations from shallow waters (<35 m) in southeast Australia that comprises over 7,000 days of measurements at 20 locations. The moored buoys measured wave conditions continuously for several months to multiple years, capturing ambient and storm conditions in diverse settings, including coastal hazard risk sites. The dataset includes tabulated time series of spectral and time-domain parameters describing wave height, period and direction at half-hourly temporal resolution. Buoy displacement and wave spectra data are also available for advanced applications. Summary plots and tables describing wave conditions measured at each location are provided.

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Foredune morphology: Regional patterns and surfzone–beach–dune interactions along the New South Wales coast, Australia

Doyle,

Hesp,

Woodroffe

2024

Earth Surf Processes Landf

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Foredunes constitute a fundamental part of the coastal environment, acting as a buffer against storm erosion and natural coastal defence. Foredune size and volume play a pivotal role in determining coastal vulnerability to marine hazards, and the governing processes driving variations in foredune morphology, particularly over regional, or larger spatial scales, are still relatively poorly understood. This paper presents a regional‐scale investigation into foredune morphology along the New South Wales (NSW) coast (SE Australia), comprising not only a state‐wide inventory of foredune morphology for use in management/hazard assessment, but also testing long‐standing hypotheses and conceptual models of the physical processes that are driving, or influencing, foredune size. We applied a remote sensing protocol to 47 foredune environments, covering the length of the NSW coastline, comparing morphology (including dune height, width, shape, and volume) of established and incipient foredunes both along, and between, sandy embayments. Results, at regional spatial scales, show that the largest foredunes (volumes up to 850 m3 m−1) occur along the central coast as large, steep landforms; intermediate‐sized dunes (550–650 m3 m−1) were found on both the Mid‐north and Far North coast, and the smallest foredunes (334–380 m3 m−1) occur on the south coast as wider dunes with steep stoss slopes. Surfzone–beach state was found to be the most significant factor influencing foredune size and volume. The more energetic and more dissipative/high‐energy intermediate surfzone–beach states were correlated with larger foredunes (i.e. greater dune volume, width and crest elevation), whereas the lower‐energy surfzone–beach states generally had smaller dunes. Changes in vegetation cover, shoreline orientation and associated onshore (and alongshore) wind systems were also demonstrated to be important factors in determining foredune morphology. The largest foredunes in NSW generally occur to the north of embayments, with dune size decreasing southward with decreasing exposure to wind/wave energy.

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50 years of beach–foredune change on the southeastern coast of Australia: Bengello Beach, Moruya, NSW, 1972–2022

Cited by 10 publications

References 55 publications

Coastal Morphodynamics and Climate Change: A Review of Recent Advances

Coastal Morphodynamics and Climate Change: A Review of Recent Advances

Nearshore wave buoy data from southeastern Australia for coastal research and management

Foredune morphology: Regional patterns and surfzone–beach–dune interactions along the New South Wales coast, Australia

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