SAR反演海浪方向谱及其在中国海和西北太平洋的特性

发布时间：2018-05-15 02:18

本文选题：合成孔径雷达 + 海浪方向谱　；参考：《中国海洋大学》2014年硕士论文

【摘要】：海浪是风应力在海—气界面上引起的波动现象，是海洋动力学的重要研究内容。海浪预报是海洋环境数值预报和海军作战环境建设的重要内容。早期的海浪观测主要依赖于现场定点浮标获得的时间序列海浪有效波高数据。空间卫星技术的发展为海浪观测提供了新的技术手段。卫星高度计提供了全球覆盖和气候学尺度的海浪有效波高数据。星载合成孔径雷达SAR提供了全天候海浪方向谱观测能力，这是海洋浮标所不可比拟的。星载SAR对海浪的独特的观测能力始于1978年Seasat-A/SAR数据。上世纪90年代之后，以欧空局发射的ERS-1、2/SAR和Envisat/ASAR为代表，世界各国发射的星载SAR为海浪研究和预报提供了强有力的支持。德国著名科学家K.Hasselmann首先提出了卫星SAR海浪图像谱与海浪方向谱之间的非线性理论关系，并基于数据同化的概念提出了从SAR图像反演海浪方向谱的方法。本文详细介绍了Hasselmann为首发展的SAR海浪方向谱反演算法MPI以及中国海洋大学ORSI研发的基于MPI方法的反演软件；利用该反演软件，处理了近10年的中国海和西北太平洋的Envisat/ASAR的全部波模式数据；收集了美国NOAA/NDBC和中国国家海洋信息中心提供的浮标海浪数据，进行了同步印证，并给出MPI反演算法在中国海和西北太平洋的反演误差；利用卫星SAR数据反演结果，给出中国海和西北太平洋海浪方向谱年、季、月平均分布，并作了初步的分析研究。
[Abstract]:Wave is a wave phenomenon caused by wind stress at the sea-air interface and is an important research content of marine dynamics. Ocean wave prediction is an important part of marine environmental numerical prediction and naval combat environment construction. The early wave observation mainly depends on the time series wave effective wave height data obtained from the spot buoy. The development of space satellite technology provides a new technique for wave observation. Satellite altimeters provide effective wave height data on a global coverage and climatological scale. Spaceborne synthetic Aperture Radar (SAR) provides all-weather wave directional spectrum observation capability, which is incomparable to ocean buoys. The unique ability of spaceborne SAR to observe waves began with the 1978 Seasat-A/SAR data. After the 1990s, with the ERS-1 / 2 / SAR and Envisat/ASAR launched by ESA, the spaceborne SAR launched by various countries in the world provided strong support for wave research and prediction. K.Hasselmann, a famous German scientist, first proposed the nonlinear theoretical relationship between the wave image spectrum of satellite SAR and the directional spectrum of the wave. Based on the concept of data assimilation, a method for retrieving the directional spectrum of waves from the SAR image was proposed. In this paper, the inversion algorithm of SAR wave direction spectrum developed by Hasselmann, MPI, and the inversion software based on MPI method developed by ORSI of Ocean University of China are introduced in detail. We have processed all the wave model data of the China Sea and the Envisat/ASAR in the Northwest Pacific Ocean for nearly 10 years, and collected the buoy wave data provided by the NOAA/NDBC of the United States and the National Oceanographic Information Center of China. The inversion error of the MPI inversion algorithm in the China Sea and the Northwest Pacific Ocean is given, and the annual, seasonal and monthly average distributions of the sea wave direction spectrum in the China Sea and the Northwest Pacific Ocean are given by using the inversion results of satellite SAR data, and the preliminary analysis is made.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P714.1;P731.22

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