Geographical Review of Japan
Online ISSN : 2185-1719
Print ISSN : 0016-7444
ISSN-L : 0016-7444
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Volume 35, Issue 12
Displaying 1-8 of 8 articles from this issue
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  • THE STUDY OF BEACH SEDIMENTS ALONG THE KUMANO URA BEACH, JAPAN
    Masatami NAKAYAMA
    1962 Volume 35 Issue 12 Pages 605-617
    Published: December 01, 1962
    Released on J-STAGE: December 24, 2008
    DOIhttps://doi.org/10.4157/grj.35.605
    JOURNAL FREE ACCESS
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    Kumano Ura Beach which extends about 25km long and 100m wide from Kumano City to Shingu City affords an ideal laboratory for a study of the processes of transportation and deposition on beach sediments. Samples of beach sediments collected are parallel and normal to the shore. These samples were analyzed in order to determine their size distribution and properties of roundness and shape. Conclusions drawn from this study are as follows:
    (1) Grain size shows a certain marked variation with changing wave condition on a beach. Generally, beach sediments show tonal distribution with finer and coarser part. Thus the grainsorting was influ enced by the differences between the action of the surf and backwash.
    (2) Beach sediments between 8 and 2mm tend to become rounded by abrasion during transportation. This fact does not agree to the results of work reported in other studies of river transported sediments. Itt is presumably the results of the rubbing of fine material as they roll over each other without the resistante of water.
    (3) On a foreshore beach pebbles show more evidence of sorting according to shape for spheroidal and ellipsoidal pebbles deposit on the place where waves reach and flat pebbles deposit in front of the place where waves reach.
    (4) Beach pebbles above 8mm tend to be flat, and those below 8mm tend to be sphered. That the shape of the larger pebbles becomes flat is probably ascribed to the fact that they only move occasionally, so that they are worn on their exposed surface by the wash of finer material. Spheroidal shape of the finer pebbles and granules are worn uniformly by rolling.
    (5) The effects of abrasion on a beach shows stronger than in a river. Nevertheless, the decrease of grain size during drift is like in a river, owing rather to the sorting than to the abrasion.
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  • A Preliminary Survey on the Cause of Yamahida (Ravines) Genesis on the Steep Slopes of the western Tanzawa Mountains, Eastern Japan
    Shingo TANAKA
    1962 Volume 35 Issue 12 Pages 618-626
    Published: December 01, 1962
    Released on J-STAGE: December 24, 2008
    DOIhttps://doi.org/10.4157/grj.35.618
    JOURNAL FREE ACCESS
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    The writer has studied the genesis and evolution of yamahida (ravines) on the steep slopes of the western Tanzawa mountains, nearly 100km. west of Tokyo. His research was first aimed at seeking for the cause of yamahida genesis, and so fractured and jointed zones in lithology, debris-avalanche scars on slopes and so forth in this area were surveyed.
    This preliminary report, however, is primarily restricted to the fractured and jointed zones only, of which all those extending along the yamahida-bottoms and others dipping at the angle of more than 70° excluding the above-mentioned ones were dealt with. Distribution maps of these zones were also made. (Figs. 3-U1, U2, M and L).
    It has become clear as a result of this survey that a majority of yamahida in this area show a distribution pattern quite similar to that of the fractured and jointed zones. Thus this correlation may well validate that the existence of such fractured and jointed zones is a major cause of yamahida genesis at least in this area.
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  • [title in Japanese]
    1962 Volume 35 Issue 12 Pages 627-635,1_1
    Published: December 01, 1962
    Released on J-STAGE: December 24, 2008
    DOIhttps://doi.org/10.4157/grj.35.627
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1962 Volume 35 Issue 12 Pages 636-645
    Published: December 01, 1962
    Released on J-STAGE: December 24, 2008
    DOIhttps://doi.org/10.4157/grj.35.636
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1962 Volume 35 Issue 12 Pages 645-655
    Published: December 01, 1962
    Released on J-STAGE: December 24, 2008
    DOIhttps://doi.org/10.4157/grj.35.645
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1962 Volume 35 Issue 12 Pages 655-665
    Published: December 01, 1962
    Released on J-STAGE: December 24, 2008
    DOIhttps://doi.org/10.4157/grj.35.655
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1962 Volume 35 Issue 12 Pages 665-675
    Published: December 01, 1962
    Released on J-STAGE: December 24, 2008
    DOIhttps://doi.org/10.4157/grj.35.665
    JOURNAL FREE ACCESS
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  • Erratum
    1962 Volume 35 Issue 12 Pages 676
    Published: 1962
    Released on J-STAGE: December 24, 2008
    DOIhttps://doi.org/10.4157/grj.35.12_676
    JOURNAL FREE ACCESS
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