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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Holocene valley aggradation driven by river mouth progradation: examples from Australia
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Holocene valley aggradation driven by river mouth progradation: examples from Australia

机译：河口扩张推动的全新世谷地沉积：澳大利亚的例子

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摘要

Since the end of the post-glacial sea level rise 6800 years ago, progradation of river mouths into estuaries has been a global phenomenon. The responses of upstream alluvial river reaches to this progradation have received little attention. Here, the links between river mouth progradation and Holocene valley aggradation are examined for the Macdonald and Tuross Rivers in south-eastern Australia. Optical and radiocarbon dating of floodplain sediments indicates that since the mid-Holocene sea level highstand 6800 years ago vertical floodplain aggradation along the two valleys has generally been consistent with the rate at which each river prograded into its estuary. This link between river mouth progradation and alluvial aggradation drove floodplain aggradation for many tens of kilometres upstream of the estuarine limits. Both rivers have abandoned their main Holocene floodplains over the last 2000 years and their channels have contracted. A regional shift to smaller floods is inferred to be responsible for this change, though a greater relative sea level fall experienced by the Macdonald River since the mid-Holocene sea level highstand appears to have been an additional influence upon floodplain evolution in this valley. Copyright (c) 2006 John Wiley & Sons, Ltd.
机译：自6800年前的冰川后海平面上升结束以来，河口向河口的扩张已成为一种全球现象。上游冲积河段对这种退化的反应几乎没有引起注意。在这里，研究了澳大利亚东南部的麦克唐纳河和特罗斯河的河口发展与全新世谷地之间的联系。漫滩沉积物的光学和放射性碳测年表明，自全新世中期海平面高点6800年前以来，沿两个山谷的垂直漫滩聚集与每个河流进入其河口的速率基本一致。河口扩张与冲积侵蚀之间的这种联系驱使泛滥平原在河口界限上游数十公里处积聚。在过去的2000年中，两条河流都放弃了主要的全新世洪泛区，其河道已经收缩。尽管由于全新世中期海平面高位以来麦克唐纳河经历的相对海平面下降似乎是对该山谷洪泛区演变的附加影响，但推断该区域变化是由较小的洪水引起的。版权所有（c）2006 John Wiley＆Sons，Ltd.

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