- Title
- Atypical responses of a large catchment river to the Holocene sea-level highstand: the Murray River, Australia
- Creator
- Helfensdorfer, Anna M.; Power, Hannah E.; Hubble, Thomas C. T.
- Relation
- Scientific Reports Vol. 10, Issue 1, no. 7503
- Publisher Link
- http://dx.doi.org/10.1038/s41598-020-61800-x
- Publisher
- Nature Publishing Group
- Resource Type
- journal article
- Date
- 2020
- Description
- Three-dimensional numerical modelling of the marine and fluvial dynamics of the lower Murray River demonstrate that the mid-Holocene sea-level highstand generated an extensive central basin environment extending at least 140 kilometres upstream from the river mouth and occupying the entire one to three kilometre width of the Murray Gorge. This unusually extensive, extremely low-gradient backwater environment generated by the two metre sea-level highstand captured most, if not all, of the fine-grained sediment discharged from the 1.06 million square kilometre Murray-Darling catchment. This material was sequestered within a >60 kilometre long, >10 metre thick valley-wide deposit of finely laminated mud. This previously unrecognised sediment trap persisted from 8,518 to 5,067 cal yr BP preventing sediment delivery to the marine environment. Its identification requires that mid-Holocene climate reconstructions for southeastern Australia based on fluctuations in the delivery of fine-grained sediment to the ocean offshore the lower Murray River's mouth must be re-evaluated.
- Subject
- Murray River; marine and fluvial dynamics; sediment trap; marine environment
- Identifier
- http://hdl.handle.net/1959.13/1426379
- Identifier
- uon:38407
- Identifier
- ISSN:2045-2322
- Rights
- This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
- Language
- eng
- Full Text
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