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Sedimentological characteristics of gravels on refreshed gravel bar by Typhoon 1721 in the middle of the Tama River, central Japan
http://hdl.handle.net/10748/00011628
http://hdl.handle.net/10748/000116281bc9e264-b42e-4fa7-a1ea-7fdb078f3048
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
20005-055-002.pdf (2.9 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||
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| 公開日 | 2020-03-30 | |||||||||
| タイトル | ||||||||||
| タイトル | Sedimentological characteristics of gravels on refreshed gravel bar by Typhoon 1721 in the middle of the Tama River, central Japan | |||||||||
| 言語 | en | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| キーワード | ||||||||||
| 主題Scheme | Other | |||||||||
| 主題 | gravel | |||||||||
| キーワード | ||||||||||
| 主題Scheme | Other | |||||||||
| 主題 | roundness | |||||||||
| キーワード | ||||||||||
| 主題Scheme | Other | |||||||||
| 主題 | 2-dimensional (2D) dune | |||||||||
| キーワード | ||||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Typhoon 1721 | |||||||||
| キーワード | ||||||||||
| 主題Scheme | Other | |||||||||
| 主題 | the Tama River | |||||||||
| 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 | departmental bulletin paper | |||||||||
| 著者 |
Utsugawa, Takako
× Utsugawa, Takako
× Shirai, Masaaki
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| 抄録 | ||||||||||
| 内容記述タイプ | Abstract | |||||||||
| 内容記述 | A gravelly point bar enlarged by Typhoon 1721 on October 23, 2017 in the middle Tama River, central Japan was investigated. The authors reported the topographical characteristics (reliefs of chute flow cutting across a point bar) and the tendency of grain size distribution along a survey line that was set perpendicular to the usual river flow direction from the river channel. The gravel bar was divided into the usual (low) riverbed, which was composed mainly of boulder–cobble-sized clasts and the high-water level (high) riverbed composed mainly of pebbles, and regularly arranged 2-dimensional(2D) dunes composed mainly of pebbles were observed on the edge of the high-water level riverbed. Additionally, the authors focused on roundness as one of the common shape parameters of gravel to discuss the representative value of gravel shape in the gravel bar. At each of the five sites selected along the survey line, cobble-sized (64–128 mm in diameter) and pebble-sized (16–32 mm in diameter) sandstones, which are the major rock type in the Tama River basin, were obtained, and the roundness of the gravel was measured. On the usual riverbed, cobbles were more rounded than pebbles, while the average roundness of cobbles on the high-water level riverbed were almost similar to that of the pebbles. Based on the tendency of coarser grains to be more rounded than finer grains, it might be concluded that the breaking and abrasion mechanisms acting on the gravel and transport process of pebble-sized clasts have differed between the two riverbeds. Therefore, the representative roundness of gravels measured at usual riverbed can be obtained in a gravel bar. |
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| 書誌情報 |
Geographical reports of Tokyo Metropolitan University 巻 55, p. 13-21, 発行日 2020 |
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| ISSN | ||||||||||
| 収録物識別子タイプ | PISSN | |||||||||
| 収録物識別子 | 03868710 | |||||||||
| 書誌レコードID | ||||||||||
| 収録物識別子タイプ | NCID | |||||||||
| 収録物識別子 | AA00200173 | |||||||||
| 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 | |||||||||
| 出版者 | ||||||||||
| 出版者 | Department of Geography, Tokyo Metropolitan University | |||||||||
| 資源タイプ | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | postprint | |||||||||
