Analysis of ocean surface captured by satellite SAR using extended ocean wave model

2014 Fiscal Year Final Research Report

• Project/Area Number: 24760403
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Hydraulic engineering
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: TAMURA Hitoshi 独立行政法人海洋研究開発機構, アプリケーションラボ, 研究員 (80419895)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 短波重力波 / 合成開口レーダ / 第三世代波浪モデル

Outline of Final Research Achievements

Satellite Synthetic Aperture Radar (SAR) have provided useful insights into the ocean surface. Because SAR images reproduce roughness at the sea surface, it is crucial to understand the physics of short gravity waves. In this study, we investigated the spectral structure and source term balance of short gravity waves. The wave model reproduced the spectral form in the higher wavenumber domain using the nonlinear dissipation term. In the equilibrium range, nonlinear transfer played a major role in maintaining equilibrium conditions. On the other hand, in the saturation range, which starts at the upper limit of the equilibrium range, nonlinear transfer did not keep up with other source terms, and the dissipation term was in balance with wind input.

Free Research Field

海洋物理学