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dc.contributor.authorDaley, James S
dc.contributor.authorCohen, Tim J
dc.date.accessioned2020-02-17T04:41:59Z
dc.date.available2020-02-17T04:41:59Z
dc.date.issued2018
dc.identifier.issn2571-550X
dc.identifier.doi10.3390/quat1030023
dc.identifier.urihttp://hdl.handle.net/10072/391598
dc.description.abstractIn the tectonically stable rivers of eastern Australia, changes in response to sediment supply and flow regime are likely driven by both regional climatic (allogenic) factors and intrinsic (autogenic) geomorphic controls. Contentious debate has ensued as to which is the dominant factor in the evolution of valley floors and the formation of late Quaternary terraces preserved along many coastal streams. Preliminary chronostratigraphic data from river terraces along four streams in subtropical Southeast Queensland (SEQ), Australia, indicate regionally synchronous terrace abandonment between 7.5–10.8 ka. All optically stimulated luminescence ages are within 1σ error and yield a mean age of incision at 9.24 ± 0.93 ka. Limited samples of the upper parts of the inset floodplains from three of the four streams yield near-surface ages of 600–500 years. Terrace sediments consist of vertically accreted fine sandy silts to cohesive clays, while top stratum of the floodplains are comprised of clay loams to fine-medium sands. The inundation frequency of these alluvial surfaces depends on their specific valley setting. In narrow valley settings, where floodplains comprise <5% of the valley floor, terraces are inundated between the 20 and 50-year annual exceedance probability (AEP) flood, while in wide settings (floodplains >20%), the terraces are no longer inundated. Floodplain inundation frequencies also vary between these settings by an order of magnitude between 5- to 50-year AEP, respectively. The correlation of terrace abandonment within SEQ with fluvial and palaeoenvironmental records elsewhere in the subtropics, and more broadly across eastern Australia, are an indication that terrace abandonment has primarily been driven by climatic forcing. Contemporaneous channel incision in the early Holocene may have been driven by an increasingly warmer and wetter environment in SEQ, with a climate commensurate with the delivery of more extreme weather events. Following channel incision, many streams in SEQ have been largely confined to their entrenched “macrochannel” form that remains preserved within the valley floor.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherMDPI
dc.relation.ispartofpagefrom23:1
dc.relation.ispartofpageto23:20
dc.relation.ispartofissue3
dc.relation.ispartofjournalQuaternary
dc.relation.ispartofvolume1
dc.subject.fieldofresearchEnvironmental Sciences
dc.subject.fieldofresearchcode05
dc.subject.keywordsScience & Technology
dc.subject.keywordsPhysical Sciences
dc.subject.keywordsGeosciences, Multidisciplinary
dc.subject.keywordsGeology
dc.subject.keywordsterrace
dc.titleClimatically-Controlled River Terraces in Eastern Australia
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationDaley, JS; Cohen, TJ, Climatically-Controlled River Terraces in Eastern Australia, Quaternary, 2018, 1 (3), pp. 23:1-23:20
dcterms.licensehttp://creativecommons.org/licenses/by/4.0/
dc.date.updated2020-02-17T04:36:28Z
dc.description.versionVersion of Record (VoR)
gro.rights.copyright© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
gro.hasfulltextFull Text
gro.griffith.authorDaley, James S.


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