Basic research on ocean waves and currents using high-frequency ocean radar

利用高频海洋雷达进行海浪和海流的基础研究

• 批准号: 16540403
• 负责人: HISAKI Yukiharu
• 金额: $ 2.46万
• 依托单位: University of the Ryukyus
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16540403/
• 关键词: physical oceanography; remote sensing; wave spectrum; high-frequency ocean radar; Doppler spectrum; Energy balance equation; ocean current; 方向分布; 四波共鳴; ヘルムホルツ分解; ドップラスペクトル; インバージョン; 風波; 海洋物理; 波浪

It is more difficult to observe ocean waves by HF ocean radar than ocean currents. The development to estimate ocean waves by HF ocean radar is necessary. Because dual radar systems are required for ocean observation by HF radar, it is difficult to find the place of the antenna deployment. I have developed the method to estimate waves from a single radar array by incorporating the energy balance equation into the analysis of radio wave scattering from the sea surface. Wave spectra are estimated from Doppler spectra on the basis of the energy balance equation and the relationship between the Doppler spectrum and the wave spectrum. It is found that wave spectrum can be estimated even in non-homogeneous wave field case from the simulation study. This method is applied to observed data, and radar-estimated wave heights are compared with in-situ observations. We found that the agreement was good. In addition, the method of the Helmholtz decomposion of ocean currents is developed. Finally, radar-estimated wave directional distributions are compared with those predicted by the model.The agreement of the wave directional distributions is good.

高频海洋雷达观测海浪比观测洋流更加困难。开发利用高频海洋雷达来估计海浪的技术是必要的。由于高频雷达进行海洋观测需要双雷达系统，因此很难找到天线部署的位置。我开发了一种通过将能量平衡方程纳入海面无线电波散射分析中来估计单个雷达阵列波的方法。基于能量平衡方程以及多普勒谱与波谱之间的关系，从多普勒谱估计波谱。仿真研究发现，即使在非均匀波场情况下，也可以估计波谱。该方法应用于观测数据，并将雷达估计的波高与现场观测进行比较。我们发现协议很好。此外，还发展了洋流亥姆霍兹分解方法。最后将雷达估计的波向分布与模型预测的波向分布进行了比较，波向分布吻合较好。

项目成果

Observation of surface currents in the west of the Okinawa Island by HF radar.

利用高频雷达观测冲绳岛西部海面洋流。

• 发表时间: 2006
• 作者: Yukiharu;Hisaki
• 通讯作者: Hisaki

Short-wave directional distribution for first-order Bragg echoes of the HF ocean radars.

高频海洋雷达一阶布拉格回波的短波方向分布。

• 发表时间: 2004
• 期刊: Journal of Atmospheric and Oceanic Technology 21
• 作者: Yukiharu;Hisaki;Hisaki Y.
• 通讯作者: Hisaki Y.

Ocean surface currents in the west of Okinawa, Japan

日本冲绳西部的洋流

• 发表时间: 2007
• 作者: Yukiharu;Hisaki;久木幸治;久木幸治
• 通讯作者: 久木幸治

Development of the wave spectrum estimation by HF radar

高频雷达波谱估计的发展

• 发表时间: 2004
• 作者: Yukiharu;Hisaki;久木幸治
• 通讯作者: 久木幸治

Estimation of short-wave directional distributions from HF radars: Comparison with model predictions

高频雷达短波方向分布的估计：与模型预测的比较

• 发表时间: 2006
• 作者: Yukiharu;Hisaki
• 通讯作者: Hisaki