Sediment transport dynamics in central Australian low-gradient landscapes quantified with cosmogenic nuclides

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dc.contributor.authorStruck, Men_AU
dc.contributor.authorJansen, JDen_AU
dc.contributor.authorCodilean, ATen_AU
dc.contributor.authorFujioka, Ten_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorKotevski, Sen_AU
dc.date.accessioned2015-09-07T01:55:46Zen_AU
dc.date.available2015-09-07T01:55:46Zen_AU
dc.date.issued2015-07-26en_AU
dc.date.statistics2015-09-07en_AU
dc.description.abstractErosion and sediment routing are key to understanding landscape evolution. In this regard, low-gradient landscapes have remained effectively unstudied in spite of their vast global extent, whereas steep mountain regions have been the focus of most research efforts. Sediment transport and storage is widely thought to occur on much longer timescales in regions of low relief relative to their steep counterparts. Here we apply in situ-produced cosmogenic nuclides to examine the sediment transport and storage history of a low-gradient catchment (Peake River) in arid central Australia. The catchment covers 27,300 km2 with a total relief of 394 m and a mean slope of 32 ± 29 m/km (mean ± 1σ, calculated from 1 arc-sec SRTM). Previous studies in central Australia have focused mainly upon local measurements of landscape lowering and bedrock erosion; however, to better understand the processes shaping these landscapes, we adopt a source-to-sink approach coupling bedrock and hillslope colluvium measurements of cosmogenic nuclides with basin-wide measurements in fluvial sediment. Variation in concentrations and ratios of 10Be and 26Al in sediment provides insights to residence times and burial history as grains are transmitted through the bedrock-hillslope-stream sediment conveyor. Our preliminary results reveal basin-wide erosion rates ranging from 0.2 to 5.8 m/Myr (weighted mean = 0.41 ± 0.03 m/Myr), which are among the lowest rates ever measured. We discuss the sediment dynamics of flat landscapes, emphasizing the contrast with steeper settings. Copyright © 2015, XIX INQUA Congress LOCen_AU
dc.identifier.citationStruck, M., Jansen, J., Codilean, A., Fujioka, T., Fink, D., & Kotevski, S. (2015). Sediment transport dynamics in central Australian low-gradient landscapes quantified with cosmogenic nuclides. Paper presented at the 19th INQUA Congress "Quaternary perspective on climate change, natural hazards and civilization" at Nagoya Convgress Centre, Nagoya, Japan 26 July 2 August 2015.en_AU
dc.identifier.conferenceenddate2 August 2015en_AU
dc.identifier.conferencename9th INQUA Congress 'Quaternary perspective on climate change, natural hazards and civilization'en_AU
dc.identifier.conferenceplaceNagoya, Japanen_AU
dc.identifier.conferencestartdate26 July 2015en_AU
dc.identifier.govdoc6017en_AU
dc.identifier.urihttp://inqua2015.jp/program/INQUA2015program.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6177en_AU
dc.language.isoenen_AU
dc.publisherScience Council of Japanen_AU
dc.subjectSedimentsen_AU
dc.subjectDynamicsen_AU
dc.subjectAustraliaen_AU
dc.subjectErosionen_AU
dc.subjectRocksen_AU
dc.subjectMountainsen_AU
dc.titleSediment transport dynamics in central Australian low-gradient landscapes quantified with cosmogenic nuclidesen_AU
dc.typeConference Presentationen_AU
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