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j.coastaleng.2020.103765.pdf | 9.31 MB | Adobe PDF | 見る/開く |
タイトル: | Vertical sorting process in oscillating water tank using DEM-MPS coupling model |
著者: | Tazaki, Takumi https://orcid.org/0009-0003-1766-8402 (unconfirmed) Harada, Eiji https://orcid.org/0000-0002-4631-6663 (unconfirmed) Gotoh, Hitoshi https://orcid.org/0000-0002-2584-6622 (unconfirmed) |
著者名の別形: | 田﨑, 拓海 原田, 英治 後藤, 仁志 |
キーワード: | Vertical sorting Swash zone Moving particle semi-implicit Discrete element method Sediment transport |
発行日: | Apr-2021 |
出版者: | Elsevier BV |
誌名: | Coastal Engineering |
巻: | 165 |
論文番号: | 103765 |
抄録: | In natural beaches, sea-beds consist of graded sediments. In swash and surf zones, wave actions lead to selective transportation and segregation of sediments. Thus, size segregation needs to be considered while determining the sediment transport rate and morphological dynamics on beaches. However, because of the strong non-linearity and the large deformed free surface, previous experimental or observational investigations failed to obtain enough knowledge about the sorting process in the swash zone. In this study, as the first investigation step of the size sorting process in the swash zone, an experiment was conducted with an oscillatory water tank, while the vertical sorting process was observed. Moreover, to further investigate the structure of the flow and movable bed, a 3D numerical simulation was performed. A coupling scheme of the discrete element method (DEM) and the moving particles semi-implicit (MPS) method was applied to reproduce the vertical sorting progress. The result revealed that the development of the vertical sorting brought about bed surface armoring and a horizontal velocity transition. Additionally, an acting force investigation disclosed that the inertia of the water surface gradient induced oscillations of the sediments, which consisted of elements, in the water tank while leading to frequent element collisions and contacts, which caused the elements to be pushed upward. |
著作権等: | © 2020. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license. The full-text file will be made open to the public on 01 April 2023 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/267540 |
DOI(出版社版): | 10.1016/j.coastaleng.2020.103765 |
出現コレクション: | 学術雑誌掲載論文等 |
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