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- W2049123081 abstract "Research Article| July 01, 2008 Riparian vegetation and the late Holocene development of an anabranching river: Magela Creek, northern Australia Stephen Tooth; Stephen Tooth † 1Institute of Geography and Earth Sciences, University of Wales, Aberystwyth SY23 3DB, UK †E-mail: set@aber.ac.uk Search for other works by this author on: GSW Google Scholar John D. Jansen; John D. Jansen 2Department of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Search for other works by this author on: GSW Google Scholar Gerald C. Nanson; Gerald C. Nanson 3School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia Search for other works by this author on: GSW Google Scholar Tom J. Coulthard; Tom J. Coulthard 4Department of Geography, University of Hull, Hull HU6 7RX, UK Search for other works by this author on: GSW Google Scholar Tim Pietsch Tim Pietsch 5Commonwealth Scientific and Industrial Research Organisation (CSIRO) Land and Water, Canberra, ACT 2601, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Stephen Tooth † 1Institute of Geography and Earth Sciences, University of Wales, Aberystwyth SY23 3DB, UK John D. Jansen 2Department of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Gerald C. Nanson 3School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia Tom J. Coulthard 4Department of Geography, University of Hull, Hull HU6 7RX, UK Tim Pietsch 5Commonwealth Scientific and Industrial Research Organisation (CSIRO) Land and Water, Canberra, ACT 2601, Australia †E-mail: set@aber.ac.uk Publisher: Geological Society of America Received: 13 Dec 2006 Revision Received: 14 Nov 2007 Accepted: 17 Nov 2007 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2008 Geological Society of America GSA Bulletin (2008) 120 (7-8): 1021–1035. https://doi.org/10.1130/B26165.1 Article history Received: 13 Dec 2006 Revision Received: 14 Nov 2007 Accepted: 17 Nov 2007 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Stephen Tooth, John D. Jansen, Gerald C. Nanson, Tom J. Coulthard, Tim Pietsch; Riparian vegetation and the late Holocene development of an anabranching river: Magela Creek, northern Australia. GSA Bulletin 2008;; 120 (7-8): 1021–1035. doi: https://doi.org/10.1130/B26165.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Many anabranching rivers are characterized by dynamic interactions between fluvial processes and riparian vegetation, but uncertainties surround the processes and time scales of anabranch development. We use geomorphological investigations and optically stimulated luminescence (OSL) dating to determine spatial and temporal trends in the development of anabranching along a 6.5-km-long reach of Magela Creek in the seasonal tropics of northern Australia. Many trees and shrubs that survive the wet-season floods establish on the sandy beds and lower banks, such that anabranches divide and rejoin around numerous ridges and islands that are formed mainly by accretion in the lee of in-channel vegetation and, less commonly, by excision from formerly continuous island or flood plain surfaces. Once ridges and islands form, colonizing vegetation maintains their stability by increasing sediment cohesion and decreasing flow erosivity. Over the Holocene, Magela Creek has vertically aggraded and extended in length by delta progradation into Madjinbardi Billabong, resulting in a time sequence of anabranches and associated ridges and islands from older (upstream) to younger (downstream). OSL ages for islands in the upstream and middle reaches are ca. 1.6 ka and older, and the narrow, deep anabranches (width/depth [w/d] typically ~10–30) have few in-channel obstructions. Farther downstream, island OSL ages are ca. 0.7 ka and younger, anabranches tend to be wider and shallower (w/d >30) with more obstructions, and splays and locally scoured island and floodplain surfaces are more common. Based on these findings, previous flow and sediment-transport measurements, and theoretical analyses, we posit that there is a decline in anabranch efficiency from an upstream equilibrium system in mass-flux balance to a downstream disequilibrium system characterized by bed aggradation and localized island and floodplain erosion. In the downstream reaches, inefficient (high w/d and obstructed) anabranches do not persist because they either aggrade and are abandoned, or they are subdivided into more efficient (lower w/d and less obstructed) anabranches as a result of the interactions between in-channel vegetation growth and ridge and island accretion or local excision. Consequently, a more efficient anabranching system gradually develops with characteristics similar to those in the upstream reaches. This enhances downstream sediment transfer, which enables ongoing delta progradation and provides fresh sediment surfaces for vegetation to colonize and initiate new anabranches. The OSL ages from Magela Creek demonstrate that a recognizable but relatively inefficient anabranching system can develop within a few centuries, while adjustment to a more efficient system occurs over a few millennia. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2049123081 title "Riparian vegetation and the late Holocene development of an anabranching river: Magela Creek, northern Australia" @default.
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