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

基本信息

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

项目摘要

(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）沿海电流模拟模型的发展：我们开发了一种基于GAL模型的数值模型，以合理的方式计算沿海前进的演变并验证其基本性能。我们应用了该模型来模拟河羽的盐正面动态行为。此外，我们试图通过引入双层坐标系统来改善沿海电流模拟模型，该系统由Nadaoka等人开发。（2000年），进入POM方案，并与RAM耦合以合理评估区域风场。作为应用程序，我们对马尼拉湾进行了数值模拟，该模拟受到了高度污染。另一方面，我们根据Nadaoka和Yagi（1998）的SDS-2DH模型开发了SDS-Q3D，用于在浅水中的湍流计算，例如珊瑚礁，海草床和潮汐平坦。我们通过纳入了低潮时的密度分层和部分干燥的效果，进一步扩展了SDS-Q3D模型。我们还开发了一种非平衡材料传输模型，该模型可以与SDS-Q3D模型相结合。这些模型基于一种光谱方法，并且具有显着的优势，它们可以应用于任意的底部地形，并且没有垂直的数值扩散。（2）开发一种新的嵌套方法：作为处理广泛区域中沿海电流计算的开放式边界问题的合理方法，我们已经开发了较大的计算结果，尽管较大的计算结果是较大的计算结果，但较大的计算方法是在较大的尺度上进行了较大的缩放计算，该计算是在整个规模的范围中，较小的计算是较大的范围。通过较小规模的计算域的边界。（3）现场调查和实验室实验：为了获取电流的数据和其他用于验证的数据，我们在演讲研究中开发的沿海电流模拟模型，我们在冲绳岛西南部的沿海地区进行了现场观测，该模型向周围的海洋开放。较少的