基于辐射传输模型的西沙群岛珊瑚礁及水质遥感监测

With the establishment of the Sansha city, the development of the Xisha Islands will be further strengthened. It will be a challenge to protect coral reefs and water ecological environment of the Xisha Islands. The monitoring of coral reefs and water environment of the Xisha Islands is necessary. This project will explore the coupling law between coral reef benthic cover and water body under optical shallow water and will establish radiative transfer model for the water where coral reefs growth by using existing theories and methods of the coral reef remote sensing monitoring and water quality monitoring. Meanwhile, field investigation, pool simulation, and indoor radiation transport simulation will be combined for the investigation based on the physical mechanisms. Based on this research, the method of extracting the reflectance of coral reef substrate and water quality information will be developed. In the basis of multi-source remote sensing data and the morphological and spectral texture features of the coral reefs, the object-oriented analysis method will be used to obtain multi-temporal distribution patterns of coral reefs in the study area. Furthermore, the influence of sea water quality on coral reefs evolution will be analyzed by integrating multi-temporal water quality data. The results of this study will be very important for the protection, management and sustainable development of coral reef ecosystems.

随着三沙市的成立，人类对于西沙群岛的开发将进一步加强，西沙群岛的珊瑚礁及水生态环境保护面临挑战。西沙群岛的珊瑚礁资源及其生长的水质环境监测迫在眉睫。本课题借鉴珊瑚礁遥感监测以及水质遥感监测已有的理论与方法，从物理机制出发，将野外实测、水池模拟和室内辐射传输模拟实验相结合，揭示光学浅水环境下珊瑚礁底栖物质与水体信息的耦合规律，建立珊瑚礁生长水域的水体辐射传输模型。在此基础上，探究一种可同时提取珊瑚礁底栖物质反射率以及水质信息的方法。基于多源遥感影像数据，考虑珊瑚礁的形态特征和光谱纹理特征，采用面向对象的分析方法，获取研究区域内多时相珊瑚礁分布格局，结合多时相的水质数据，分析海水水质对珊瑚礁演变的影响。研究成果可为珊瑚礁生态系统的保护、管理与可持续发展提供重要的参考依据。

随着三沙市的成立，人类对于西沙群岛的开发将进一步加强，西沙群岛的珊瑚礁及水生态环境保护面临挑战。西沙群岛的珊瑚礁资源及其生长的水质环境监测迫在眉睫。本课题通过野外调查测量，建立了西沙群岛典型底质光谱数据库；利用自主研发的设备,测量获得的西沙群岛清洁海水固有光学参数；基于经典的辐射传输模拟软件hydrolight，研究了珊瑚礁底栖物质信息与水体信息的耦合规律，分析了不同水质、水深条件下，基于离水辐射可区分的珊瑚类别；在此基础上，借鉴珊瑚礁遥感监测以及水质遥感监测已有的理论与方法，从物理机制出发，建立珊瑚礁生长水域的水体辐射传输模型，并提出一种可同时提取珊瑚礁底栖物质反射率以及水质信息的方法。基于多时相的worldview数据，获取了研究区域内多时相底质类别及水质数据。研究成果可为珊瑚礁生态系统的保护、管理与可持续发展提供重要的参考依据。