A method of spatial arrangement of offshore breakwaters for effective wave attenuation and changing currents

有效衰减波浪和改变水流的近海防波堤空间布置方法

• 批准号: 02650362
• 负责人: NAKAMURA Takayuki
• 金额: $ 1.41万
• 依托单位: Ehime University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650362/
• 关键词: Offshore breakwater system; Effective spatial array; Wave directional change; Wave height attenuation; Wave-induced current; Wave energy dissipation; Green's function method; 低反射効果; 波浪流; 波浪制御効果; 平面的配置; 波浪制御

In order to effectively attenuate incoming waves and control wave-induced currents, the spatial arrangement and allocation of offshore breakwaters is examined extensively. The following 3 topics have been especially dealt with in this study. (1)Wave dissipation mechanism and the resultant mean current features based on the vertical 2-D model of the breakwaters: Various types of breakwater, e.g. a concrete block breakwater, caisson breakwater, curtain-walled breakwater, floating breakwater and submerged breakwater, are used in order to clarify the wave dissipation mechanism of each type of breakwater. Characteristics of the mean current caused by the wave dissipation around the breakwater have been also studied. As a result, if is confirmed that the wave energy dissipation by the concrete block breakwater is mainly caused by the wave slamming inside the breakwater, wave breaking for the rubble mound breakwater, vortex formation around the angular or sharp corners for the curtain-walled … More breakwater and floating breakwater. It is also shown that the mean current around the breakwater has a close relation with the wave dissipation mechanism.(2)Effective arrangement and allocation of offshore breakwaters for reducing incoming waves: For all types of the breakwater used in this study, it is recommended that the pitch length between neighboring breakwaters should be less than the incident wave length because the generation of obliquely transmitted waves through the breakwater array is restrained. Furthermore, in the case of a floating breakwater array, the staggered array is very effective for reducing incoming waves if the projected gap length of the neighboring breakwaters on the array axis is equal to 0.(3)Effective arrangement and allocation of offshore breakwaters for changing the wave propagation direction: When the rectangular caisson is placed in such a way that the inclination angle from the array axis is in the range of 8 to 20 degrees, it is clarified that the obliquely propagating wave component becomes predominant in the lee side of the breakwater array. As a result, it is possible to control the intensity and direction of the wave induced current in the near shore region. Less

为了有效地衰减传入波和控制波诱导的电流，对海上防波堤的空间排列和分配进行了广泛的检查。在这项研究中特别涉及以下三个主题。 （1）基于防波堤的垂直2-D模型的波浪耗散机制和所得平均电流特征：各种类型的防波堤，例如为了阐明每种防波堤的波浪耗散机制，使用了混凝土块防波堤，凯森防波堤，窗帘墙的防波堤，浮动的防波堤和淹没的防波堤。由于防波堤周围的波耗散引起的平均电流的特征也已经研究了。结果，如果确认，混凝土块防波堤的波能耗散主要是由巨大的波动撞击的波浪，碎石丘丘的波动，在窗帘壁墙周围或锋利的角落形成涡流的涡流形成……更多……更多……更多……更多的防波堤和浮动的防水器。 It is also shown that the mean current around the breakwater has a close relation with the wave dissipation mechanism.(2)Effective arrangement and allocation of offshore breakwaters for reducing incoming waves: For all types of the breakwater used in this study, it is recommended that the pitch length between neighboring breakwaters should be less than the incident wave length because the generation of obliquely transmitted waves Through the breakwater array is restored.此外，在浮动的防波气阵列的情况下，如果阵列轴上相邻的防波堤的预计间隙长度等于0，则交错的阵列非常有效地减少传入波，如果距离距离距离的有效排列和分配的有效排列和分配。 8至20度，可以澄清的是，在防波堤阵列的Lee侧，倾斜的繁殖波分量占主导地位。结果，可以控制近岸区域中波动电流的强度和方向。较少的

项目成果

中村 孝幸: "矩形堤体列まわりの平面的な波変形の特性と波向き制御法に関する研究" 土木学会海岸工学論文集. 39. 536-540 (1992)

Takayuki Nakamura：“矩形堤坝阵列周围平面波变形特性和波向控制方法的研究”日本土木工程师学会学报，海岸工程学报 39. 536-540 (1992)。

中村 孝幸: "斜波中における浮体列まわりの波浪境界値問題の解析法に関する研究" 愛媛大学 工学部 紀要. 12-3. 249-259 (1993)

Takayuki Nakamura：“斜波中浮体周围波浪边值问题的分析方法”爱媛大学工学部通报12-3（1993）。

中村 孝幸: "直線配列された浮防波堤の波浪制御効果に関する研究" 土木学会海洋開発論文集. 8. (1992)

Takayuki Nakamura：“直线布置的浮动防波堤的波浪控制效果研究”日本土木工程师学会海洋开发学报8。（1992）。

中村 孝幸: "浮防波堤の平面的な配置法に関する研究" 土木学会海岸工学論文集. 39. 531-535 (1992)

Takayuki Nakamura：“浮动防波堤平面布置的研究”日本土木工程师学会会议录，海岸工程学39. 531-535（1992）。

中村 孝幸: "各種の平面形状を有する共振装置型堤体列の波浪制御効果について" 土木学会海岸工学論文集. 37. 529-533 (1990)

Takayuki Nakamura：“关于具有各种平面形状的谐振器型路堤阵列的波浪控制效果”，日本土木工程师学会会议记录，海岸工程学会，37. 529-533 (1990)。