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  1. 学術雑誌論文
  2. 沖縄地理学会
  3. 沖縄地理
  4. 7号
  1. 部局別インデックス
  2. その他

[論文] 琉球石灰岩の海食崖にみられるノッチの限界深さ : 八重山諸島・黒島での事例

http://hdl.handle.net/20.500.12000/0002017729
http://hdl.handle.net/20.500.12000/0002017729
38696db7-3096-42ba-ae1c-a963c670a62a
名前 / ファイル ライセンス アクション
No7p25.pdf No7p25.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2018-11-16
タイトル
タイトル [論文] 琉球石灰岩の海食崖にみられるノッチの限界深さ : 八重山諸島・黒島での事例
言語 ja
タイトル
タイトル [Articles] Critical Depth of Notch of Coastal Cliffs Made of Ryukyu Limestone in Kuroshima, Yaeyama Islands
言語 en
作成者 青木, 久

× 青木, 久

ja 青木, 久

en Aoki, Hisashi

Search repository
松倉, 公憲

× 松倉, 公憲

en Matsukura, Yukinori

ja 松倉, 公憲

Search repository
前門, 晃

× 前門, 晃

en Maekado, Akira

ja 前門, 晃

Search repository
小暮, 哲也

× 小暮, 哲也

en Kogure, Tetsuya

ja 小暮, 哲也

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
内容記述
内容記述タイプ Other
内容記述 A wave-cut notch is formed at the base of vertical coastal cliffs made of Ryukyu Limestone in the Ryukyus, Japan. Many rectangular blocks, which appear to have originated in cliff failures, are observed on shore platforms in front of the cliffs. This fact suggests that the development of a notch increases the cliff instability and eventually results in a cliff failure. In order to determine the critical depth of a notch, the two limestone coasts were selected in Koroshima, Yaeyama Islands. We measured the horizontal depth of a notch, cliff height (h) and block length though field investigations. Notch depth, cliff height and block length range from 2.0-4.0 m. 1.5-2.4 m and 3.0-4.7 m, respectively. Assuming that the occurrence of cliff failure follows the principle of a cantilever, the critical depth of notch (l_c) should be given by: l_c=√^B<hS_1/pg> where S_1 is the tensile strength in rock mass, g is the acceleration due to gravity, and B is a nondimensional constant. An analysis of the field data applying to this equation indicated that a boundary condition for delimiting the presence of notched cliffs and fallen blocks given by B = 1.5x 10^3.
言語 en
出版者
言語 ja
出版者 沖縄地理学会
出版者
言語 en
出版者 The Okinawa Geographical Society
言語
言語 jpn
資源タイプ
資源タイプ journal article
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0916-6084
収録物名
言語 ja
収録物名 沖縄地理
書誌情報
号 7, p. 25-32
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