Journal of the Sedimentological Society of Japan
Online ISSN : 1882-9457
Print ISSN : 1342-310X
ISSN-L : 1342-310X
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Volume 42, Issue 42
Displaying 1-5 of 5 articles from this issue
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  • Sedimentation of suspended red soils in Manza Beach coastal areas, the Okinawa Island, Japan
    Satoshi Yamamoto, Tsuguyuki Tohma
    1995 Volume 42 Issue 42 Pages 1-9
    Published: September 11, 1995
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4096/jssj1995.42.1
    JOURNAL FREE ACCESS
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    The dispersal processes of fine-grained red soils into coral reefs were studied at Manza Beach coastal areas of Onna Village, the Okinawa Island, Japan. The dispersal processes as the sedimentation of suspended sediment were studied immediately after the heavy precipitation in the area. In addition to this, the dispersal processes as bottom sediments were studied by grain size and other analyses on the bottom sediments. The red soils form front areas both as suspended sediment and as bottom sediments in the area of about 150m offshore from the estuary. The prevention of the outflow of red soils into the coral reefs is concerned with the technique how to settle or trap the red soils in the estuary. Several possible techniques are presented in this report.
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  • How did Sediment-Laden Underflows Pass over the Subaqueous Hill?
    Glacier-Fed Peyto Lake, Alberta, Canada
    Kazuhisa Chikita, Norman D. Smith, Noboru Yonemitsu, Marta Perez-Arluc ...
    1995 Volume 42 Issue 42 Pages 11-20
    Published: September 11, 1995
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4096/jssj1995.42.11
    JOURNAL FREE ACCESS
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    Dynamics of a unique behavior of sediment-laden underflows was examined in Peyto Lake, Alberta, Canada. As the characteristic basin shape, this lake has a subaqueous, traverse hill 7m high in the middle. The sediment-laden underflows should be driven only by the downslope component of gravity. Our previous studies of sedimentation in Peyto Lake, however, pointed out the possibility of the underflow passing over the hill and subsequently inducing sedimentation in the distal region. We thus examined the mechanism of the underflow's hill-passing by observing meteorological conditions, river sediment discharge and lake currents in the glacier-melt season of 1993. It is concluded that the underflow does not directly pass over the hill, but is produced downlake of the hill, due to the suspension storage in a proximal maximum-depth region by the continuous underflow and its consequent overflow on the hill. This overflow only occurred at mort than a critical river sediment discharge, and continuously produced sediment-laden underflow in a distal region.
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  • Antidunes in a small gorge on the beach sand, the Sanriku Coast, northeast Japan
    Koji Yagishita
    1995 Volume 42 Issue 42 Pages 21-28
    Published: September 11, 1995
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4096/jssj1995.42.21
    JOURNAL FREE ACCESS
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    Antidunes are observed in a small-scale beach gorge that is made by a creek flow debouched from the sea bluff, the Sanriku Coast, northeast Japan. The occurrence of such bedforms may not be unusual but have probably been overlooked to date. Antidunes reported here are three-dimensional (3-D) bedforms and show rather different hydraulic conditions from those produced as two-dimensional (2-D) antidunes that commonly occur in laboratory flume experiments. Geometries of antidunes in ancient rocks may give us some clues to deduce paleohydraulic conditions, such as the paleo-flow velocity. However, we have to be cautious and need to know what type of antidunes is predominant in individual outcrops.
    Despite a little volume of the creek discharge, homogeneous, well-sorted and medium- to fine-grained beach sands on the Sanriku Coast together with the rapid flow of the creek provide the best opportunity to produce the bedforms of upper-flow-regime.
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  • Remarks on the present state of sedimentary geology in Japan from a Scandinavian perspective
    W. Nemec
    1995 Volume 42 Issue 42 Pages 29-32
    Published: September 11, 1995
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4096/jssj1995.42.29
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  • Report from 1995 AAPG Annual Convention in Houston
    Ken Ikehara
    1995 Volume 42 Issue 42 Pages 33-41
    Published: September 11, 1995
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4096/jssj1995.42.33
    JOURNAL FREE ACCESS
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