Determining the impact of the Holocene highstand at the coastal-fluvial interface, Shoalhaven River, south-eastern Australia

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dc.contributor.authorKermode, SJen_AU
dc.contributor.authorGibling, MRen_AU
dc.contributor.authorJones, BGen_AU
dc.contributor.authorCohen, TJen_AU
dc.contributor.authorPrice, DMen_AU
dc.contributor.authorDaley, JSen_AU
dc.date.accessioned2014-06-24T06:52:10Zen_AU
dc.date.available2014-06-24T06:52:10Zen_AU
dc.date.issued2013-10-01en_AU
dc.date.statistics2014-06-24en_AU
dc.description.abstractWith enhanced rates of sea-level rise predicted for the next century, the upstream extent of sea-level influence across coastal plains is a topic of public importance. Australian coastal rivers provide a testing ground for exploring this issue because the area is tectonically stable, was not glaciated, and experienced a Holocene highstand between 7.4 and 2ka of up to 1.5m above Australian Height Datum (AHD). In the Shoalhaven River of New South Wales, investigation of a confined bedrock reach at Wogamia, 32km inland, has identified a unit of dark, cohesive silt and sand with marine diatoms, shell fragments, and enhanced pyrite content, interpreted as estuarine. The unit is up to 13m thick, thickens downstream, and is overlain by fluvial channel and floodplain deposits. The estuarine unit on-laps a remnant Pleistocene terrace and extends to approximately +2.2m AHD. Optically stimulated luminescence (OSL) and radiocarbon ages suggest that estuarine deposition commenced prior to 7.8kacal bp, predating the highstand by similar to 500years, and that marine influence in the area continued to 5.3 +/- 0.7ka. During this period, a delta probably persisted at Wogamia, where a narrow upstream reach opens out, and subsequently advanced to fill the broad Shoalhaven coastal embayment. Although the effect of sea-level rise depends on many factors, the results suggest that, during a highstand at or above present sea level, a strong marine influence may extend for tens of kilometres inland and penetrate confined bedrock reaches landward of coastal embayments. © 2013, Wiley-Blackwell.en_AU
dc.identifier.citationKermode, S. J., Gibling, M. R., Jones, B. G., Cohen, T. J., Price, D. M., & Daley, J. S. (2013). Determining the impact of the Holocene highstand at the coastal-fluvial interface, Shoalhaven River, south-eastern Australia. Earth Surface Processes and Landforms, 38(13), 1481-1495. doi:10.1002/esp.3882en_AU
dc.identifier.govdoc5462en_AU
dc.identifier.issn0197-9337en_AU
dc.identifier.issue13en_AU
dc.identifier.journaltitleEarth Surface Processes and Landformsen_AU
dc.identifier.pagination1481-1495en_AU
dc.identifier.urihttp://dx.doi.org/10.1002/esp.3382en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5715en_AU
dc.identifier.volume38en_AU
dc.language.isoenen_AU
dc.publisherWiley Blackwellen_AU
dc.subjectSea levelen_AU
dc.subjectAustraliaen_AU
dc.subjectQuaternary perioden_AU
dc.subjectCoastal regionsen_AU
dc.subjectQuartzen_AU
dc.subjectRiversen_AU
dc.titleDetermining the impact of the Holocene highstand at the coastal-fluvial interface, Shoalhaven River, south-eastern Australiaen_AU
dc.typeJournal Articleen_AU
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