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Geology and sedimentary history of modern estuaries

Chapter


Abstract


  • Modern estuaries are part of a continuum of coastal depositional

    environments within which the variation in geomorphology is closely related to

    the dominant one of three main processes affecting sedimentation, viz waves,

    tides or rivers. The present location of the coast is controlled by sea-level rise

    brought about by the release of water from continental ice sheets following the

    glacial maximum around 20,000 years ago. The current form of the coast is partly

    inherited from the shape of the precedent land surface flooded by the rising sea,

    which is then modified by a combination of ongoing local erosion and/or deposition

    of sediment transported by rivers from the adjacent land mass or submarine

    erosion, and then redistributed by the locally dominant marine processes. Once

    eustatic sea level stabilised around 6–7000 years ago, sediment was able to progressively

    infill the topographically lower areas, except in areas where glacial

    rebound is ongoing. In some cases, where the rate of sedimentation is relatively

    high, infill of coastal indentations may have been completed, and the coast is now

    prograding seaward. Elsewhere, where sedimentation rates are lower, or waves

    and tides are able to effectively move sediment away from the point of river

    entry, infill may have only partially proceeded, and the coast has been modified

    into characteristic forms. Where waves dominate over tides, features made from

    coarse-grained sediments such as barriers, beaches and bars, form parallel to the

    general trend of the coast. These establish less-energetic environments isolated

    from the full force of the ocean, where fine-grained sediments can accumulate.

UOW Authors


  •   Skilbeck, C Gregory. (external author)
  •   Heap, Andrew (external author)
  •   Woodroffe, Colin

Publication Date


  • 2017

Citation


  • Skilbeck, C. Gregory., Heap, A. D. & Woodroffe, C. D. (2017). Geology and sedimentary history of modern estuaries. In K. Weckstrom, K. M. Saunders, P. A. Gell & C. Gregory. Skilbeck (Eds.), Applications of Paleoenvironmental Techniques in Estuarine Studies (pp. 45-74). Dordrecht, The Netherlands: Springer.

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/4561

Book Title


  • Applications of Paleoenvironmental Techniques in Estuarine Studies

Start Page


  • 45

End Page


  • 74

Place Of Publication


  • Dordrecht, The Netherlands

Abstract


  • Modern estuaries are part of a continuum of coastal depositional

    environments within which the variation in geomorphology is closely related to

    the dominant one of three main processes affecting sedimentation, viz waves,

    tides or rivers. The present location of the coast is controlled by sea-level rise

    brought about by the release of water from continental ice sheets following the

    glacial maximum around 20,000 years ago. The current form of the coast is partly

    inherited from the shape of the precedent land surface flooded by the rising sea,

    which is then modified by a combination of ongoing local erosion and/or deposition

    of sediment transported by rivers from the adjacent land mass or submarine

    erosion, and then redistributed by the locally dominant marine processes. Once

    eustatic sea level stabilised around 6–7000 years ago, sediment was able to progressively

    infill the topographically lower areas, except in areas where glacial

    rebound is ongoing. In some cases, where the rate of sedimentation is relatively

    high, infill of coastal indentations may have been completed, and the coast is now

    prograding seaward. Elsewhere, where sedimentation rates are lower, or waves

    and tides are able to effectively move sediment away from the point of river

    entry, infill may have only partially proceeded, and the coast has been modified

    into characteristic forms. Where waves dominate over tides, features made from

    coarse-grained sediments such as barriers, beaches and bars, form parallel to the

    general trend of the coast. These establish less-energetic environments isolated

    from the full force of the ocean, where fine-grained sediments can accumulate.

UOW Authors


  •   Skilbeck, C Gregory. (external author)
  •   Heap, Andrew (external author)
  •   Woodroffe, Colin

Publication Date


  • 2017

Citation


  • Skilbeck, C. Gregory., Heap, A. D. & Woodroffe, C. D. (2017). Geology and sedimentary history of modern estuaries. In K. Weckstrom, K. M. Saunders, P. A. Gell & C. Gregory. Skilbeck (Eds.), Applications of Paleoenvironmental Techniques in Estuarine Studies (pp. 45-74). Dordrecht, The Netherlands: Springer.

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/4561

Book Title


  • Applications of Paleoenvironmental Techniques in Estuarine Studies

Start Page


  • 45

End Page


  • 74

Place Of Publication


  • Dordrecht, The Netherlands