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Late Quaternary river evolution of floodplain pockets along Mulloon Creek, New South Wales, AustraliaDepartment of Physical Geography, Division of Environmental and Life Sciences, Macquarie University, North Ryde, NSW 2109, Australia
School of Geography and Environmental Science, University of Auckland, Private Bag 92019, Auckland, New Zealand, g.brierley{at}auckland.ac.nz Valley confinement along upper-middle reaches of Mulloon Creek, in the upper Shoalhaven catchment of southern New South Wales, Australia, restricts floodplain development to a series of distinct pockets. These pockets comprise a downstream-thinning wedge of vertically accreted fine-grained deposits atop basal gravels. Some time before 12 500 years ago a bedload-dominated river was transformed into a suspended load system. In the mid-late Holocene, swamps developed in the middle-lower part of each floodplain pocket. Within a few decades of European settlement of this region (circa AD 1820), discontinuous watercourses in some floodplain pockets had incised to form a low-sinuosity gravel-bed channel. Wedge-shaped units of post-incisional alluvium that thicken downstream overlie the swamp and floodplain deposits in the downstream part of these pockets. In the downstream-most pocket, incision commenced prior to colonization, while upstream swamps retain a continuous swamp across the valley floor. The late Quaternary evolution of this variant of discontinuous watercourse is summarized in a schematic model.
Key Words: Discontinuous watercourse • incised channel • swamp • floodplain pocket • river change • alluvium • late Quaternary • Holocene • New South Wales • Australia
The Holocene, Vol. 16, No. 5,
661-674 (2006) This article has been cited by other articles:
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