Recurrence of Extreme Coastal Erosion in SE Australia Beyond Historical Timescales Inferred From Beach Ridge Morphostratigraphy

T. Tamura*, T.S.N. Oliver, A.C. Cunningham, C.D. Woodroffe

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    Extreme storms present a major risk to coasts. Increasing populations worldwide, together with sea level rise, exacerbate concerns for coastal settlements, but the low frequency of extreme storms makes an assessment of risk difficult. In southeast Australia, the severest beach retreat on record relates to a series of extratropical cyclones in the 1970s, but the relatively short observational record hinders assessment of how frequent these events are. At Moruya in New South Wales, four decades of beach monitoring has provided new insights into response of beaches to extreme storms. We augment this recorded history with morphostratigraphic analysis of beach ridge evolution by using ground‐penetrating radar and optically stimulated luminescence dating. We find an episode of extreme retreat over 550 years, proving that the 1970s extreme event is a recurrent phenomenon. Our high‐precision morphostratigraphic analysis provides evidence with which to better plan coastal adaptation.
    Original languageEnglish
    JournalGeophysical Research Letters
    Volume46
    Issue number9
    Pages (from-to)4705-4714
    ISSN0094-8276
    DOIs
    Publication statusPublished - 2019

    Keywords

    • Beach
    • Coastal erosion
    • Extreme storm
    • Coastal conservation
    • Optically stimulated luminescence dating
    • Beach ridge

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