Generation Mechanism of Flow Pattern Change and Rapid Water Exchange in Mutsu Bay

陆奥湾流态变化与快速水交换的生成机制

• 批准号: 11650528
• 负责人: NISHIDA Shuzo
• 金额: $ 2.24万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650528/
• 关键词: Mutsu Bay; enclosed bay; residual flow; water exchange; field observation; 3D-simulation; 気象擾乱; 水交換; 津軽海峡; 急潮; 3次元流動シミュレーション; 粒子追跡シミュレーション; シミュレーション

Flow structures and water qualities in an enclosed bay are influenced by conditions of tide and wind. Moreover, in a bay opening to a strait, a little change in flow structure of the strait greatly affects water exchange in the bay.To clarify the mechanism of the water exchange in such a bay, we have carried out field observations around the mouth of Mutsu Bay, located in the North Japan. The Mutsu Bay is opening to the Tsugaru Strait connecting the Japan Sea with the Pacific Ocean. Flow structure and density structures were measured by using an ADCP and a STD.Main results in this study are summarized as follows.1. There exists internal wave with large amplitude in summer, and the induced flow is dominant in the vicinity of the bay mouth. 2. The flow pattern in the bay mouth could be identified by tidal characteristics at the ends of the strait. 3. The generation of the northward current in the bay mouth at east wind is caused by outflow of the set-up water. 4. The residual circulation is formed behind the Tappi Cape, and affects the flow structure in the bay mouth. 5. The water exchange is activated by rise of water level and generation of wind according to the street of the low-pressure.

封闭海湾中的水流结构和水质受到潮汐和风条件的影响。此外，在向海峡开放的海湾中，海峡的水流结构的微小变化对海湾中的水交换有很大的影响。为了弄清这种海湾中的水交换机制，我们在日本北部的陆津湾口附近进行了实地观测。陆津湾正在向连接日本海和太平洋的津轻海峡开放。利用ADCP和STD测量了河道的水流结构和密度结构，主要研究结果如下：1.夏季存在较大幅度的内波，湾口附近以诱导流为主。2.湾口的流态可以通过海峡两端的潮汐特征来识别。3.东风时湾口北向流的产生是由增升水的出流引起的。4.残留环流在塔皮角后面形成，影响湾口的水流结构。5.根据低压街道，水位上升和风的产生激活了水交换。

项目成果

西田修三(分担執筆): "日本の水環境2-東北編"日本水環境学会編,技報堂出版 (印刷中).

西田修三（合着）：《日本的水环境2 - 东北版》，日本水环境协会编，Gihodo Publishing（正在印刷）。

山中亮一, 他: "気象擾乱を考慮した陸奥湾の流動解析"海岸工学論文集. 48. 401-405 (2001)

Ryoichi Yamanaka 等人：“考虑天气干扰的陆奥湾流量分析”海岸工程论文 48. 401-405 (2001)。

S. Nishida, et al.: "Flow Structure and Influential Factors on it Around the Mouth of Mutsu"Proceedings of Coastal Engineering, JSCE. Vol. 47. 416-420 (2000)

S. Nishida 等人：“陆奥口周围的水流结构及其影响因素”，海岸工程学报，JSCE。

S. Nishida, et al.: "Flow and residual flow in the mouth of enclosed strait"Proceedings of the 4th International Conference on Hydro-Science and Engineering, Session MT. (in CD-ROM). (2000)

S. Nishida 等人：“封闭海峡口的流动和残余流”第四届国际水利科学与工程会议论文集，会议 MT。

山中亮一 他: "陸奥湾湾口部の流動構造に及ぼす影響因子"土木学会関西支部年次学術講演会概要集. II-52 (2001)

Ryoichi Yamanaka等：“陆奥湾口水流结构的影响因素”日本土木工程学会关西分会年度学术会议摘要II-52（2001年）。