Investigation of heavy shoaling process in small-or middle-scale harbors based on non-equilibrium suspended sediment transport analysis and field observation

基于非平衡悬沙输移分析和现场观测的中小型港口严重浅滩过程研究

• 批准号: 04650453
• 负责人: NADAOKA Kazuo
• 金额: $ 1.47万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650453/
• 关键词: heavy shoaling of Harbor; field observation; non-equilibrium suspended sediment transport; horizontal large-scale eddies; long-period motion; 剥離渦

Through the field observation conducted at Iioka fishery Harbor in the periods from September 22 to October 14 in 1992 and from September 13 to October 25 in 1993, the mechanism of heavy shoaling of small-or middle-scale harbors has been investigated. The main findings in the field-data analysis are as follows.(1)Long-period motion in the water surface and horizontal velocity fluctuation was observed at the harbor entrance.(2)This long-period motion is generated by combined mechanism due to incident-wave groupiness and harbor amplification.(3)The long-period motion causes the flow separation at the harbor-entrance edges of the breakwater, which results in the generation of horizontal large-scale eddies. These eddies may suspend the appresiable amount of bottom sediment, which is then transported by the long-period motion towards the calm area in the harbor.

通过1992年9月22日至10月14日和1993年9月13日至10月25日在饭冈渔港进行的现场观测，探讨了中小型渔港严重变浅的机理。实地数据分析的主要结果如下。（1）在港口处观测到水面长周期运动和水平速度脉动。（2）这种长周期运动是由入射波群性和港口放大作用共同作用的结果。（3）长周期运动引起防波堤进口边缘的水流分离，产生水平大尺度涡。这些涡旋可以悬浮适量的底沙，然后通过长周期运动将其向港内平静区输送。

项目成果

八木宏,灘岡和夫,中野充: "重合波動場に形成されるmigrating rip-cumentの構造に関する研究" 海岸工学論文集. 41. 336-340 (19914)

Hiroshi Yagi、Kazuo Nadaoka、Mitsuru Nakano：“叠加波场中形成的迁移裂流的结构研究”海岸工程学报 41. 336-340 (19914)。

松本朗,松岡道男,中山哲厳,山本潤,灘岡和夫,八木宏: "中小港湾埋没機構解明に向けての長期連続観測の試み" 海岸工学論文集. 40. 491-495 (1993)

Akira Matsumoto、Michio Matsuoka、Tetsugen Nakayama、Jun Yamamoto、Kazuo Nadaoka、Hiroshi Yagi：“通过长期连续观测阐明中小型港口淤积机制的尝试”《海岸工程学报》40. 491-495。 (1993)

Nadaoka, K.and Yagi, H.: "A turbulence model for shallow water and its application to large-eddy computation of longshore currents" J.of Hydraulic, Coastal and Environmental Eng., JSCE. No.473/II-24. 25-34 (1993)

Nadaoka, K. 和 Yagi, H.：“浅水湍流模型及其在滨海流大涡计算中的应用”J. of Hydro，Coastal and Environmental Eng.，JSCE。

灘岡和夫,八木宏,二瓶泰雄,野本康介: "非対称振動流の乱流構造特性について" 海岸工学論文集. 41. 141-145 (19914)

Kazuo Nadaoka、Hiroshi Yagi、Yasuo Nihei、Kosuke Nomoto：“论非对称振荡流的湍流结构特征”海岸工程杂志 41. 141-145 (19914)。

Nadaoka, K., Yagi, H., Nihei, Y.and Nomoto, K.: "Turbulence structure of asymmetrically oscillating flow" Proc.Coastal Eng., JSCE. Vol.41. 141-145 (1994)

Nadaoka, K.、Yagi, H.、Nihei, Y. 和 Nomoto, K.：“非对称振荡流的湍流结构”Proc.Coastal Eng.，JSCE。