Study on Current and Mass transfer at the Middle and Large Depth of Ocean by Hydraulic Model Test and Numerical Simulation

中大洋深度水流与质量传递的水力模型试验与数值模拟研究

• 批准号: 12305066
• 负责人: SATO Toru
• 金额: $ 13.34万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12305066/
• 关键词: Ocean Current Model; Rotational Tank; Hydraulic Model; Density Current; Stratification; Coriolis Force; Ariake Bay; Isahaya Inlet; 二層成層; 数値流体解析; 諫早湾潮受堤防; コリオリ力; 回転流体; 可視化; 輝度法; 海洋モデル; 海洋中深層; 物質循環; 水理模型; 海域浄化; 海洋汚染

Mechanisms in the mass transfer in the ocean including density current were elucidated numerically and experimentally.Firstly, a numerical simulation code for the spatial scale of closed bays was developed. One of the special features of this model is the combination of a full- 3-D model and a hydrostatic-pressure appropriation model. This was applied to investigate the effect of water-purification by using density current in Gokasho Bay, Mie Prefecture. Its results are in qualitatively good agreement with the observation. Then, a hydrostatic model of the bay was installed in the rotational tank The spread of dye was examined by the luminance method and gives similar results with the calculation.Next, experiments for observing the effect of the Coriolis force on density current was carried out in a smal I circular tank of the diameter of 1m, set in the above-mentioned rotating tank. It was found that the spread of density current is explained by an appropriate non-dimensionalisation, when no rotation. It is also observed that the rotation suppresses the spread and, as the Rossby number becomes small (the rotation increases), a break-up of the dye spread occurs. Our 3D CFD simulation gave similar results.Lastly, the hydrographical change by the existence of the Isahaya dyke was examined. It was shown by the model test that the residual current in Isahaya Inlet abates by the installation of the dyke to a significant extent. This may attenuate the water exchange in the inlet and give a chance to red tide growth. Also observed is that the current change at the mouth of the inlet push the nutrients supplied by Chikugo River away from the seaweed cultivation fields in the northwest of Ariake Bay. This may also cause the damage.

通过数值模拟和实验研究，阐明了包括异重流在内的海洋中物质传递的机理。首先，开发了封闭海湾空间尺度的数值模拟程序。该模型的特点之一是将全三维模型与静水压力分配模型相结合。这是应用于调查水净化的效果，通过使用异重流在五所湾，三重县。其结果与观测结果在定性上是一致的。然后，在旋转水槽中安装了海湾的流体静力学模型，用亮度法测定了染料的扩散，得到了与计算相一致的结果.接着，在上述旋转水槽中安装了一个直径为1m的小型圆形水槽，进行了科氏力对异重流影响的实验观测.有人发现，密度电流的传播是由一个适当的无量纲化，当没有旋转解释。还观察到，旋转抑制扩散，并且随着Rossby数变小（旋转增加），发生染料扩散的破裂。我们的3D CFD模拟也得到了类似的结果。最后，对伊沙亚堤坝的存在所带来的水文变化进行了研究。模型试验结果表明，在伊沙亚湾设置围堤后，余流得到明显减弱。这可能会减弱入水口的水交换，并为赤潮生长提供机会。此外，还观察到入口处的水流变化将筑后河提供的营养物质从有明湾西北部的海藻养殖场推走。这也可能造成损害。

项目成果

Toru Sato, Kazunori Koike, Takuro Yoshikawa, Yoshihiro Tsuchiya: "Hydraulic Model Test and Numerical Simulation of Density Current"Prorc. 22th Int. Conf. on Offshore Mech., and Arctic ENG.(in print).

Toru Sato、Kazunori Koike、Takuro Yoshikawa、Yoshihiro Tsuchiya：“密度流的水力模型试验和数值模拟”Prorc。

Toru Sato: "CFD simulation of plume behaviour and model prediction of biological impacts in CO_2 ocean sequestration"Procedure of 20th International Conference on Offshore Mechanics and Arctic Engineering. OSU-5162-1-OSU-5162-8 (2001)

佐藤彻：“CO_2海洋封存中羽流行为的CFD模拟和生物影响模型预测”第20届国际近海力学与北极工程会议程序。

殿城賢三: "MECモデルを用いた五ヶ所湾海域浄化シミュレーション"第16回海洋工学シンポジウム講演予稿集. 49-52 (2001)

Kenzo Tonojo：“使用MEC模型进行五所湾海域清理模拟”第16届海洋工程研讨会论文集49-52（2001年）。

江原健太郎: "回転水槽を用いた密度流拡散に関する水理模型実験の基礎的検討"第16回海洋工学シンポジウム講演予稿集. 381-388 (2001)

Kentaro Ebara：“使用旋转水箱的密度流扩散水力模型实验的基础研究”第16届海洋工程研讨会论文集381-388（2001）。

殿城賢三: "MECモデルの開発及び海域浄化装置の効果に関する数値シミュレーション"関西造船協会誌. 236. 289-296 (2001)

Kenzo Tonojo：“MEC模型的开发和海域净化设备效果的数值模拟”关西造船协会杂志236。289-296（2001）。