| 基于多时间序列Landsat-8遥感影像的珊瑚礁白化监测 |
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| 引用本文： | 吴柯,杨帆,徐莹.基于多时间序列Landsat-8遥感影像的珊瑚礁白化监测[J].地质科技通报,2022,41(5):181-189. |
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| 作者姓名： | 吴柯 杨帆 徐莹 |
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| 作者单位： | 1.中国地质大学(武汉)地球物理与空间信息学院, 武汉 430074 |
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| 基金项目： | 国家自然科学基金区域联合基金重点项目U21A2013"全球变化与海气相互作用(二期)"专项GASI-01-DLYG-WIND01中央高校基本科研业务费专项资金资助项目2642022009 |
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| 摘 要： | 近年来, 受人类活动和全球变暖的双重影响, 我国南海区域珊瑚礁生态系统退化, 发生白化现象。利用遥感技术监测和掌握珊瑚礁的白化情况, 对南海生态环境的保护和治理具有重大价值。首先通过多期海表温度数据获取珊瑚礁白化预警的区域, 选定西沙群岛永乐环礁中的羚羊礁作为研究对象; 然后, 提出了一种新型的珊瑚礁白化监测模型, 分别采取水深校正、珊瑚礁分类、反射率调整以及阈值选择等方式对2013-2018年的Landsat-8遥感影像开展了多时间序列的珊瑚礁白化监测研究。最终的结果显示, 该模型能够较为准确地获取珊瑚礁白化区域, 为南海珊瑚礁白化现象的长时间序列监测提供依据。
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| 关 键 词： | Landsat-8 珊瑚礁白化 水深校正 支持向量机 高斯混合模型 多时间序列 |
| 收稿时间： | 2022-09-14 |
Coral reef bleaching monitoring based on multitime Landsat-8 remote sensing image series |
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| Institution: | 1.Institute of Geophysics and Geomatics, China University of Geoscience(Wuhan), Wuhan 430074, China2.National Satellite Ocean Application Service, Beijing 100081, China |
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| Abstract: | In recent years, due to the influence of human activities and global warming, the coral reef ecosystem in the South China Sea (SCS) has degraded, and bleaching occurs. Utilizing the remote sensing method to monitor and understand the bleaching status of coral reefs is of great value to the protection and management of the ecological environment in the SCS. This study first obtains coral reef bleaching alert areas (BAAs) through multiperiod sea surface temperature data (SST) and selects the Antelope Reef in the Yongle Atoll of the Paracel Islands as the research area. Then, a new coral reef bleaching monitoring model is proposed, which uses water depth correction, coral reef classification, reflectance adjustment and threshold selection to carry out multitime series coral reef bleaching monitoring research with Landsat-8 remote sensing images from 2013 to 2018. The results show that the model can effectively obtain coral reef bleaching areas and provide a feasible approach for the monitoring of coral reef bleaching in the South China Sea. |
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