浅海水下地形多角度太阳耀光遥感研究

At present, the research sun glitter remote sensing imagery of submarine topography is not deep enough. The existing depth inversion methods with sun glitter need to input wind, current and other environmental parameters, and their results are affected by the synchronization and accuracy of the environmental parameters greatly. Based on the sun glitter radiation transmission model and the sea surface roughness modulation mechanism from submarine topography, this project focuses on sand wave to research and develop the mechanism and inversion method of multi-angle sun glitter remote sensing. Firstly, the work is to analyze the changing of multi-angle sun glitter radiation intensity of sand wave under different environmental conditions and observation parameters, and to understand the physical meaning of sea surface multi-angle sun glitter radiation transmission. The next step is to explore the methods to estimate some key environmental parameters, such as wind speed and current speed, based on the multi-angle sun glitter remote sensing images. The next work is to develop the sand wave topography inversion method with multi-angle sun glitter remote sensing images without supporting of wind speed and current velocity. Then, the sand waves in the Taiwan Banks are selected as the study area to validation the models, methods and results. The project will put forward a kind of remote sensing method for sand wave topography with multi angle sun glitter remote sensing images and without external supporting of wind and current. This work is an extension of sun glitter remote sensing, which will promote the further development of remote sensing research of submarine topography, and which has very important the utility value and scientific meaning.

目前,水下地形太阳耀光遥感研究尚不够深入系统，已有的水下地形太阳耀光遥感反演方法都需要输入风速和流速等环境参数，其结果很大程度上受环境参数的同步性及精度影响。本项目基于太阳耀光辐射传输模型和地形对海面粗糙度的调制机制，以沙波地形为例，开展水下地形多角度太阳耀光遥感研究。首先以太阳耀光辐射传输模型为基础，通过数值模拟仿真和遥感数据分析，进一步理解不同环境条件和观测参数下的太阳耀光辐射特征，探讨浅海水下地形多角度太阳耀光辐射特征差异及其物理关联，攻克局地风速和流速等关键环境参数的估算难题，发展无需外部风速和流速参数支持的水下地形遥感反演方法。然后以台湾浅滩沙波群为研究区进行检验和评价。本项目期望提出一种无需外部风速和流速参数支持的沙波地形多角度太阳耀光遥感反演方法，是水下地形太阳耀光遥感在多角度方向上的拓展，对促进浅海水下地形遥感研究和应用的进一步发展，具有十分重要的实用价值和科学意义。

针对当前水下地形太阳耀光遥感研究尚不够深入的现状，本项目围绕多角度太阳耀光遥感及其在浅海沙波地形探测中的应用，以太阳耀光辐射传输模型为基础，通过数值模拟仿真和遥感数据分析，进一步理解不同环境条件和观测参数下的太阳耀光辐射特征，探讨浅海水下地形多角度太阳耀光辐射特征差异及其物理关联，攻克局地风速和流速等关键环境参数的估算难题，发展无需外部风速和流速参数支持的水下地形遥感反演方法。具体来说取得了以下一些研究成果：1）拓展了多角度太阳耀光几何参数计算方法，实现了多角度太阳耀光遥感影像逐像元的几何参数计算；2）深化了浅海正负地形和不同流向的四种地形类型对海表流场的调制影响的认识；3）发展了多角度太阳耀光遥感海面粗糙度估算模型，实现了海面粗糙度和风速的高分辨率反演；4）通过通过模拟仿真和真实遥感影像分析，解释了浅海沙波地形多角度太阳耀光遥感影像特征差异，进一步认识和理解了浅海沙波地形多角度太阳耀光遥感机理；5）提出了一种基于多角度太阳耀光遥感的浅海沙波地形反演新方法，具有无需初始风速和海表流速等外部环境参数和沙波地形形态先验知识等优势。本研究将太阳耀光遥感模型从单视角向多角度方向进行了拓展，对促进海洋多角度太阳耀光遥感方向研究和应用具有重要价值。