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  • Alluvium of antiquity: Polycyclic terraces in a confined bedrock valley

    Author(s)
    Kermode, S.
    Cohen, T.
    Reinfelds, I. V.
    Nanson, G.
    Pietsch, Tim
    Griffith University Author(s)
    Pietsch, Tim
    Year published
    2012
    Metadata
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    Abstract
    Confined river valleys are not the localities where long term preservation of alluvium would be expected. The 25 km long low gradient (0.0014 m.m− 1) confined valley setting of the Shoalhaven River has archived alluvium of middle Pleistocene age to maintain a relatively uniform channel as an efficient conduit for a wide range of flows in a confined bedrock valley of variable morphology. Single-grain optically stimulated luminescence (OSL) dating has identified polycyclic terraces up to 193 ka in age (marine isotope stage [MIS] 7) with lower terrace remnants dating from 173–140 ka (MIS 6) and 106 ka (MIS 5). Holocene alluvium ...
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    Confined river valleys are not the localities where long term preservation of alluvium would be expected. The 25 km long low gradient (0.0014 m.m− 1) confined valley setting of the Shoalhaven River has archived alluvium of middle Pleistocene age to maintain a relatively uniform channel as an efficient conduit for a wide range of flows in a confined bedrock valley of variable morphology. Single-grain optically stimulated luminescence (OSL) dating has identified polycyclic terraces up to 193 ka in age (marine isotope stage [MIS] 7) with lower terrace remnants dating from 173–140 ka (MIS 6) and 106 ka (MIS 5). Holocene alluvium 2–3.5 ka in age caps these old Pleistocene units and a well-constrained combination of one-dimensional and two-dimensional hydraulic modelling demonstrates that these polycyclic terraces are clearly within reach of the modern hydrological regime. The 106 ka terrace at 17 m above low flow is inundated by floods recurring on average every ~ 20 years, and the 140–193 ka terraces at 20–22 m are overtopped every 50–100 years. These ancient diachronous landforms exhibit complex depositional histories and are on-lapped by longitudinal benches of modern sand and gravel. Their polycyclic nature appears to be a response to flow reduction, using alluvium to adjust the boundary of the otherwise inflexible morphology of a bedrock gorge.
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    Journal Title
    Geomorphology
    Volume
    139-140
    DOI
    https://doi.org/10.1016/j.geomorph.2011.11.012
    Subject
    Geomorphology and Regolith and Landscape Evolution
    Geology
    Physical Geography and Environmental Geoscience
    Publication URI
    http://hdl.handle.net/10072/48241
    Collection
    • Journal articles

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