Development of multi-scale ocean-wave coupled model and its engineering application

[研究目标]在日本附近建立多尺度海浪耦合模式，以辅助海洋资源和能源的开发、助航和危险海域的预报和规避。多尺度海浪耦合模式和分布式数据服务器系统的研制在WAVEWATCHIII^&lt；TM&gt；(日本以东1/4度日本模式)的基础上开发了三重嵌套海浪模式。五天预报包括反常浪指数。通过用户友好的数据服务器(OPeNDAP和各种地理信息系统)向用户提供输出。预测模型输出通过访问受限服务器提供。后播产品可在http://157.82.253.137/&157.82.253.137/las_v7/v6/datet2上获得。了解基本过程通过引入SOPHIS…改进了波浪模型非线性源项(Sriam)的更有刻度的数字。在改进源项的情况下，利用耦合模型对波流相互作用进行了研究，发现流引起的线性聚焦影响很小，与原来的预期相反，风的变化对波流相互作用的影响占主导地位。工程应用与远洋船舶安全航行：重新分析了海难事件(1980 Oonomichi-Maru，2008 Suwa-Maru)期间的海况，并研究了反常波浪指数(方向传播、频带宽度和波浪陡度)的时间演变。由分析可知，海况在方向传播和频带宽度参数空间中的运动轨迹是反映畸形波发生概率增大的有用指标。此类参数可用于警告目的。这些参数通过我们的数据服务器提供。&lt；其他应用&gt；：使用JCOPE再分析产品；甲烷水合物钻井平台的安全评估，选择适合产生洋流能量的地点，以及了解鱼苗和鱼卵的运输过程。较少

[Goal of the research]To construct multi-scale ocean-wave coupled model near Japan, for assisting ocean resources and energy development, navigation assistance and prediction and circumvention of dangerous seas. The model outputs, observation and derived products such as the freak wave index will be served via distributed data server system.[Accomplishments]1. Development of multi-scale ocean-wave coupled model and distributed data server systemTriplly nested wave model was developed based on WAVEWATCHIII^<TM> (1 degree Pacific model>> 1/4 degree Japan model>> 1/16 model east of Japan). Five-day forecast includes freak wave index. The outputs are made available for the user via user-friendly data servers (OPeNDAP and various GIS). The forecast model outputs are served through access restricted server. Hind-cast products are available at: http://157.82.253.137/ & 157.82.253.137/las_v7/v6/dataset2. Understanding the fundamental processesThe wave model was improved by introducing a sophis … More ticated numeric of the nonlinear source term (SRIAM). With the improved source term, the wave-current interaction was studied with the coupled model, revealing that the effect of linear focusing due to current was minimal, contrary to the original anticipation, and the effect of wind variation is dominating.3. Engineering applications<Safety navigation of ocean-going ships>: The sea state during the marine accident cases were reanalyzed (1980 Onomichi-maru, 2008 Suwa-maru), and the temporal evolution of the freak wave indices (directional spread, frequency bandwidth and wave steepness) were investigated. From the analysis, the trajectory of the sea state in the parameter space of directional spread and frequency bandwidth turns out to be a useful index of the increased probability of freak wave. Such parameter is useful for warning purposes. Those parameters are served through our data server.<Other applications>: JCOPE reanalysis product was utilized for; safety evaluation of the methane-hydrate drilling platform, selection of suitable sites for ocean current energy production, and to understand the transport process of fish larvae and eggs. Less