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シルト質マイクロデルタの縦断面形状に関する水路実験 : 流量,土砂供給速度,水深の依存性(<特集>巨大地震と地形災害)
http://hdl.handle.net/2297/35983
http://hdl.handle.net/2297/35983d0acc8c9-87b5-4b99-b035-f9be80ba30b5
名前 / ファイル | ライセンス | アクション |
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SC-PR-ENDO-N-469.pdf (959.1 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2017-10-03 | |||||
タイトル | ||||||
タイトル | シルト質マイクロデルタの縦断面形状に関する水路実験 : 流量,土砂供給速度,水深の依存性(<特集>巨大地震と地形災害) | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Flume experiments on microdelta formation: Different mechanism between silty and fine-sandy grains | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
鈴木, 太郎
× 鈴木, 太郎× 遠藤, 徳孝 |
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書誌情報 |
地形 /Transactions, Japanese Geomorphological Union 巻 33, 号 4, p. 469-484, 発行日 2012-10-25 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0389-1755 | |||||
NCID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00333248 | |||||
出版者 | ||||||
出版者 | 日本地形学連合 = Transactions, Japanese Geomorphological Union / Japanese Geomorphological Union | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | マイクロデルタの縦断面形の,流量及び砕屑物供給速度,水深に対する依存性に関して水路実験を行い,シルトと細粒砂の場合で比較した.細粒砂の場合,先行研究と同様に,流量の増加に伴いスロープ・コンタクト(フォーセットとボトムセットの境界)はアンギュラー型からタンジェンシャル型に変化した.一方,シルトを用いた場合は,マイクロデルタの斜面形状の変化傾向が,細粒砂の場合と異なることを発見した.シルト質マイクロデルタは,流量の増加に伴いタンジェンシャル型からアンギュラー型を経て再びタンジェンシャル型に変化した.高流量域で発生するタンジェンシャル型は,浮遊した粒子が剥離渦の戻り流れによりスロープ・コンタクトに堆積することで形成された.低流量域で発生するタンジェンシャル型は,密度流と連続的に流下する粒子流が粒子をスロープ・コンタクトへ運搬することで形成された. In this study, flume experiments were performed to investigate the trend of change in the topographies of silty microdeltas depending on water discharge, sediment supply rate, and water depth, in comparison with the topographies of microdeltas formed from fine sand. Previous studies have demonstrated that the contact between the foreset and bottomset of sandy and gravelly microdeltas changes from an angular contact to a tangential one as water discharge increases. This behavior was also observed in the present experiment when fine sand was used. However, this study presents a new relationship between the topography of silty microdeltas and water discharge. For silt, a tangential contact, an angular contact, and a second tangential contact appeared in that order with increase in water discharge. Visual observation revealed that the tangential contact in the lower-discharge regime was formed by the combination of laminar density currents and continuous grain flows, whereas that in the higher-discharge regime was generated by grain fall. | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | http://www.jgu.jp/ | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | http://ci.nii.ac.jp/naid/110009554479 |