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The bay is separated into two parts by a breakwater with a narrow opening and the dynamical condition at the opening of the breakwater is assumed to follow the wellknown relationship in hydraulics between the volume flux through the opening and the difference of water levels across the breakwater. Several different cases such as tidal oscillations, invasion of tsunamis, and storm surges are considered and the theoretical results are compared with those of model experiments as far as possible. It appears that a simple theoretical model presented here can explain with satisfaction the observed change of wave height at the head of the bay with respect to the change of the period of forcing functions and / or the area of the opening, as long as the opening is small. Thus, the most important factor in this kind of phenomena should be the following non-dimensional parameter: B ; for tidal oscillations, η*/K; for tsunamis and storm surges. For details, see § 4 and § 3 respectively. The amplitude and phase changes of the tidal oscillation inside the bay can be estimated as a function of B from Fig. 2. The effect of a breakwater on invading tsunamis of the solitary type is shown in Fig. 9. The effectiveness of a breakwater on storm surges is seen in Figs. 10-15. From these figures it is evident that the period of the oscillating water body in relation to the incoming wave period or the given period of external forces seems to be the decisive factor in determining the effectiveness of the barrier, in addition to the geometry of the bay, the area of the opening and the wave amplitude. 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湾水振動におよぼす防波堤の効果
https://doi.org/10.15083/0000033724
https://doi.org/10.15083/00000337245ee6ab13-cf7d-4045-b227-34f759dd9e1a
名前 / ファイル | ライセンス | アクション |
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ji0412006.pdf (1.0 MB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2008-05-30 | |||||
タイトル | ||||||
タイトル | 湾水振動におよぼす防波堤の効果 | |||||
言語 | ja | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15083/0000033724 | |||||
ID登録タイプ | JaLC | |||||
その他のタイトル | ||||||
その他のタイトル | Effects of a Breakwater on the Oscillations of Bay Water | |||||
著者 |
梶浦, 欣二郎
× 梶浦, 欣二郎 |
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著者別名 | ||||||
識別子 | 131695 | |||||
識別子Scheme | WEKO | |||||
姓名 | Kajiura, Kinjiro | |||||
著者所属 | ||||||
著者所属 | 地震研究所 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The effects of a large breakwater with a constricted opening on the oscillations of bay water as a whole are examined on the basis of a very simple one-dimensional mathematical model. The bay is separated into two parts by a breakwater with a narrow opening and the dynamical condition at the opening of the breakwater is assumed to follow the wellknown relationship in hydraulics between the volume flux through the opening and the difference of water levels across the breakwater. Several different cases such as tidal oscillations, invasion of tsunamis, and storm surges are considered and the theoretical results are compared with those of model experiments as far as possible. It appears that a simple theoretical model presented here can explain with satisfaction the observed change of wave height at the head of the bay with respect to the change of the period of forcing functions and / or the area of the opening, as long as the opening is small. Thus, the most important factor in this kind of phenomena should be the following non-dimensional parameter: B ; for tidal oscillations, η*/K; for tsunamis and storm surges. For details, see § 4 and § 3 respectively. The amplitude and phase changes of the tidal oscillation inside the bay can be estimated as a function of B from Fig. 2. The effect of a breakwater on invading tsunamis of the solitary type is shown in Fig. 9. The effectiveness of a breakwater on storm surges is seen in Figs. 10-15. From these figures it is evident that the period of the oscillating water body in relation to the incoming wave period or the given period of external forces seems to be the decisive factor in determining the effectiveness of the barrier, in addition to the geometry of the bay, the area of the opening and the wave amplitude. The present theory is applicable to the cases where the opening is sufficiently small so that the non- linear effects predominate in the motion of water near the opening. | |||||
書誌情報 |
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 巻 41, 号 2, p. 403-418, 発行日 1963-07-30 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00408972 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00162258 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
日本十進分類法 | ||||||
主題 | 453 | |||||
主題Scheme | NDC | |||||
出版者 | ||||||
出版者 | 東京大学地震研究所 | |||||
出版者別名 | ||||||
Earthquake Research Institute, University of Tokyo |