DOI: 10.1016/j.quascirev.2013.03.002
Scopus记录号: 2-s2.0-84876438446
论文题名: Late Quaternary changes in flow-regime on the Gwydir distributive fluvial system, southeastern Australia
作者: Pietsch T.J. ; Nanson G.C. ; Olley J.M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 69 起始页码: 168
结束页码: 180
语种: 英语
英文关键词: Gwydir distributive fluvial system
; Late Quaternary palaeohydrology
; Optically stimulated luminescence
; Southeastern Australia
Scopus关键词: Fluvial systems
; Increased discharges
; Last glacial cycles
; Late quaternary
; Murray-Darling Basin
; New South Wales , Australia
; Optically stimulated luminescence
; South-eastern Australia
; Catchments
; Glacial geology
; Luminescence
; Runoff
; catchment
; glacial-interglacial cycle
; Holocene
; La Nina
; Last Glacial
; luminescence
; paleochannel
; paleohydrology
; river discharge
; runoff
; synchrony
; Australia
; Darling Basin
; Gwydir Wetlands
; Murray Basin
; New South Wales
; Pacific Ocean
; Pacific Ocean (West)
英文摘要: Ages for large palaeochannels of the Gwydir distributive fluvial system (DFS) in northern New South Wales, Australia have been determined using single grain optically stimulated luminescence. Two palaeochannel systems have been found to dominate; the here named Coocalla (43-34 ka) and Kamilaroi (19-16 ka) which have inferred palaeodischarges 25-100 times the bankfull discharges of nearby channels of the contemporary Gwydir system, which appears to have been established during the Mid-Holocene. This scale differential is very much larger than that reported for other catchments in southeastern Australia, and reflects both a decline in catchment runoff through the Last Glacial cycle and the adoption of a distributary pattern sometime after 16 ka. Actual decline in catchment runoff, determined by comparing estimated palaeodischarge with contemporary flows upstream of the DFS where flow is confined to a single channel, indicate contemporary discharge to be 0.1 times and 0.25 times that of the Coocalla and Kamilaroi, respectively.The chronology presented here shows periods of increased discharge in the Gwydir to be more or less coincident with those observed elsewhere in the Murray Darling Basin. Although no evidence of a 'Gum Creek' fluvial phase (from 35 to 25 ka) was found, the Coocalla and Kamilaroi palaeochannel systems broadly conform in age to 'Kerarbury' and 'Yanco' fluvial phases on the Murrumbidgee and Murray systems. This synchronicity with more southern catchments supports the hypothesis that La Nina - like conditions were semi-permanent for much of the Last Glacial cycle with moisture derived largely from the western Pacific Ocean. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60644
Appears in Collections: 过去全球变化的重建
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作者单位: Australian Rivers Institute, Griffith University, Nathan Campus, 170 Kessels Road, Nathan, QLD 4111, Australia; School of Earth and Environmental Sciences, University of Wollongong, NSW 2522, Australia
Recommended Citation:
Pietsch T.J.,Nanson G.C.,Olley J.M.. Late Quaternary changes in flow-regime on the Gwydir distributive fluvial system, southeastern Australia[J]. Quaternary Science Reviews,2013-01-01,69