基于SAR的浅海水域地形反演研究

项目名称： 基于SAR的浅海水域地形反演研究

项目编号： No.41476151

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 周云轩

作者单位： 华东师范大学

项目金额： 95万元

中文摘要： 河口海岸水下地形及水深信息是涉及河口海岸各学科领域研究的基本要素，快速获取大范围的河口海岸水深数据，对于地貌演变监测、海岸工程建设和防护、航道清淤、及风暴潮灾害预测和防御等具有重要意义。本研究应用合成孔径雷达SAR数据，探讨河口海岸浅海水域水下地形及水深的SAR成像机理和反演方法。依据雷达后向散射机理，综合考虑海表波-流相互作用下整个微尺度波的变化对雷达后向散射截面的贡献，建立雷达波与海表面微尺度波相互作用的雷达后向散射模型；结合同步观测数据和数值模拟，建立描述海表流场与海表面微尺度波相互作用的波-流相互作用模型，精准反演海表流场；构建海表流场与河口海岸二维或三维浅海水域水下地形相互作用的流模式；深入分析河口海岸浅海水域水下地形的SAR影像特征，完善SAR浅海水域水下地形的成像机理，发展基于成像机理的SAR浅海水域水下地形/水深反演模型，并且定性定量分析SAR反演模型的误差源及不确定性。

中文关键词： 微波遥感；合成孔径雷达；水下地形；遥感反演；数值模拟

英文摘要： Bathymetry in estuarine and coastal waters is vital to researches in all research areas related to estuaries and coasts. Fast and correct acquisition of bathymetric data is very significant in monitoring estuarine and coastal erosion, coastal enginnering works construction and protection, shiping channel dredging, and coastal storm surge hazard predition and prevention, and many other applicable fields. In the proposed study,we investigate the SAR imaging principle and inversion methods for bathymetric data under shallow waters from spaceborne synthetic aperture radar (SAR) data. Based on radar backscattering principle, taking into the consideration of the contribition in backscattering cross-section due to the sea surface micro-scale wave changes caused bysea surface wave and current interaction, a radar backscatter model will be developed. With synchronized in-situ observations and numerical simulations,a sea surface wave and current interaction model will be established to describe the interaction between the sea surface current and sea surface micro scale wave. The model will be used to derive an accurate sea surface current. In addition, the current model under interaction between sea surface current and the 2D or 3D shallow water bathymetry will also be built. The SAR imaging features of the underwater topography under estuarine and coastal waters.The SAR imaging principle for bathymetry in shallow waters will be improved. An underwater terrain/bathymetry inversion model will thus be developed.the error sources and uncertainties in the SAR bathymetry inversion model will be presented.

英文关键词： microwave remote sensing;SAR;bathymetry;remote sensing inversion;numerical simulation