Journal of the Sedimentological Society of Japan
Online ISSN : 1882-9457
Print ISSN : 1342-310X
ISSN-L : 1342-310X
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Volume 69, Issue 2
Displaying 1-7 of 7 articles from this issue
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Cover Story
Article
  • Emergence and drowning of fluviodeltaic systems during steady rise of sea level: Implication from geometrical modeling and tank experiments
    Arti Tomer, Tetsuji Muto
    2010 Volume 69 Issue 2 Pages 63-72
    Published: December 30, 2010
    Released on J-STAGE: April 12, 2011
    DOIhttps://doi.org/10.4096/jssj.69.63
    JOURNAL FREE ACCESS
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    Drowning of coastal environments is believed to be a primary consequence of sea level rise predominating over sediment supply. Casting doubt on this conventional notion, our geometrical model, along with supportive physical experiments, suggests that where hinterland slope is steeper than delta’s foreset slope, (1) complete drowning of a fluvial delta is possible even with constant rise of relative sea level (rate rslr) and constant sediment supply (rate qS) (autodrowning), (2) there exists a critical magnitude of initial water depth (Hcrt) that does not allow an initially drowned depositional system to become emerged or develop an alluvial realm, and (3) where initial water depth is smaller than Hcrt, the initially drowned depositional system inevitably changes into a deltaic one (autoemergence). There does not exist a balanced state between qS (›0) and rslr (›0) with which a depositional system can hold deltaic sedimentation and avoids autodrowning and/or preceding autoemergence. The function of qS and rslr is simply to determine how fast these autogenic processes are attained and how large Hcrt is.
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Research Report
  • Sedimentary facies and physical properties of the latest Pleistocene to Holocene sediment core (GS-KZK-1) in the Shibakawa Lowland, Kawaguchi City, central Japan
    Junko Komatsubara, Rei Nakashima, Katsumi Kimura
    2010 Volume 69 Issue 2 Pages 73-84
    Published: December 30, 2010
    Released on J-STAGE: April 12, 2011
    DOIhttps://doi.org/10.4096/jssj.69.73
    JOURNAL FREE ACCESS
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    The stratigraphy and transitions of sedimentary environments in the latest Pleistocene to Holocene incised valley-fills in the Shibakawa Lowland are revealed based on sedimentary facies, physical properties and chemical element contents in the GS-KZK-1 core, Kawaguchi City, Saitama Prefecture. A transverse section based on several existing core data is also examined.
    The sedimentary succession is composed of Pleistocene Shimosa Group and Post-glacial incised-valley fills. The latter is subdivided into six units in ascending order; river channel fills, floodplain deposits, inner-bay deposits, tidal channel deposits, inner-bay deposits, salt marsh to back marsh deposits.
    The transverse section indicates that the basal gravels in the valley fill may have been derived from the gravelly layers in the Pleistocene Shimosa Group and sandy layers in the middle and upper parts do not cover the entire valley, which is mostly filled with muddy sediments.
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