Improvement of a coastal current computation model based on dual-sigma coordinate system and GAL model

基于双sigma坐标系和GAL模型的沿岸流计算模型的改进

• 批准号: 12555147
• 负责人: NADAOKA Kazuo
• 金额: $ 5.25万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555147/
• 关键词: coastal current; numerical shallow water current model; SDS-Q3D model; non-equilibrium material transport model; wide-area coastal current model; new nesting method; the west of Okinawa Island; coral reef and sea grass areas in Ishigaki Island; 数値

(1) Developments of Coastal Current Simulation Models : We developed a numerical model based on GAL model to calculate coastal front evolution in a reasonable manner and verified its fundamental performance. We applied this model to simulate dynamic behavior of saline front of a river plume. Besides we have attempted to improve a coastal current simulation model by introducing the dual-sigma coordinate system, which has been developed by Nadaoka et al. (2000), into the scheme of POM, and coupling with RAMS to reasonably evaluate a regional wind field. As an application we performed numerical simulation for Manila Bay, which is highly polluted. On the other hand we developed SDS-Q3D, on the basis of SDS-2DH model by Nadaoka and Yagi (1998), for turbulent flow computation in shallow water like coral reef, sea grass bed and tidal flat. We further extended SDS-Q3D model by incorporating the effects of density stratification and partial drying-up of the computational region at low tide to e … More nable the computations of, e.g., density currents over tidal flat near a river mouth. We developed also a non-equilibrium material transport model, which may be easily coupled with the SDS-Q3D model. These models are based on a spectral method, and have remarkable advantages that they can be applied to arbitrary bottom topography and are free from vertical numerical diffusion.(2) Development of a New Nesting Method : As a reasonable way to handle an open boundary problem for coastal current computation in wide area, we have developed a new nesting method in which larger scale computational results are reflected on smaller scale computations through entire grid points, although in the previous methods larger scale results are reflected only through boundaries of smaller scale computational domain.(3) Field Surveys and Laboratory Experiments : For obtaining data of currents and others for validation the coastal current simulation model developed in the present study, we performed field observations at the coastal area in the southwest of Okinawa Island, which is open to the surrounding oceans. Less

(1)近岸流模拟模式的发展：我们在GAL模式的基础上发展了一个数值模式，以合理地计算海岸锋的演变，并验证了其基本性能。将该模型应用于模拟盐渍锋面河流羽流的动态行为。此外，我们还尝试通过引入Nadaoka等人开发的双西格玛坐标系来改进近岸流模拟模型。(2000)，引入POM方案，并与RAMS耦合，以合理地评估区域风场。作为应用，我们对污染严重的马尼拉湾进行了数值模拟。另一方面，我们在Nadaoka和Yagi(1998)的SDS-2DH模型的基础上，发展了用于珊瑚礁、海草床和潮滩等浅水湍流计算的SDS-Q3D。我们进一步扩展了sds-q3d模式，考虑了密度分层和退潮时计算区的部分干涸的影响到e…。例如，对河口附近潮滩上的密度流的计算更加方便。我们还建立了一个非平衡物质输运模型，该模型可以很容易地与SDS-Q3D模型相耦合。这些模型基于谱方法，具有适用于任意海底地形且不存在垂直数值扩散的显著优点。(2)新嵌套方法的开发：作为处理大范围近岸流计算开放边界问题的一种合理方法，我们开发了一种新的嵌套方法，该方法通过整个网格点在较小尺度的计算中反映较大尺度的计算结果，而在以前的方法中，较大尺度的计算结果仅通过较小尺度的计算域的边界来反映。(3)实地调查和实验室实验：为了获得用于验证本研究所开发的近岸水流模拟模型的流等数据，我们在冲绳岛西南部沿海地区进行了实地观测，冲绳岛西南部与周围海洋开放。较少

项目成果

K.NADAOKA and H.TAMURA: "Development of 3-D shallow water turbulence mode! and its application to numerical simulations of 3-D large-scale eddies"Computational Fluid Dynamics Symposium. Vol.14 (CD-ROM). (2000)

K.NADAOKA 和 H.TAMURA：“3-D 浅水湍流模式的发展！及其在 3-D 大型涡流数值模拟中的应用”计算流体动力学研讨会。

K.NADAOKA, Y.NIHEI, G.HANADA, S.FUJII, et al.: "Long-distance transport analysis of coral planulae with HF radar, drifting buoys and numerical simulation"Proceedings of Coastal Engineering, JSCE. Vol.48, No.1. 431-435 (2001)

K.NADAOKA、Y.NIHEI、G.HANADA、S.FUJII 等：“利用高频雷达、漂流浮标和数值模拟对珊瑚浮球进行长距离传输分析”，日本海岸工程学报，海岸工程学报。

Y.MACHIDA, Y.NIHEI, K.SATO, T.NISHIMURA and K.NADAOKA: "Numerical simulation of a flow structure around Naruto Strait with a new nesting approach"Proc. Spring Meeting of JOS. 288 (2001)

Y.MACHIDA、Y.NIHEI、K.SATO、T.NISHIMURA 和 K.NADAOKA：“采用新的嵌套方法对鸣门海峡周围流动结构进行数值模拟”Proc。

Yasuo NIHEI,Kazuo NADAOKA and Ryoko KUMANO: "A multi-nesting approach for numerical simulation of coastal currents with a new assimilation method"Abstract of 9^<th> Int.Coral Reef Sympo.. 237 (2000)

Yasuo NIHEI、Kazuo NADAOKA 和 Ryoko KUMANO：“采用新同化方法对沿岸流进行数值模拟的多重嵌套方法”第 9 届 Int.Coral Reef Sympo.. 237（2000）摘要

二瓶泰雄, 灘岡和夫, 森井順之: "GALモデルに基づく高精度フロント追跡計算手法の開発"海岸工学論文集. 47・2. 1001-1005 (2000)

Yasuo Nihei，Kazuo Nadaoka，Yoshiyuki Morii：“基于GAL模型的高精度前沿跟踪计算方法的开发”海岸工程杂志47・2（2000）。