| ZHU Haitian,JIANG Xingwei,MENG Xuelian,FENG Qian,CUI Songxue,LIANG Chao. 2016. A quantitative approach to monitoring new sand cay migration in Nansha Islands. Acta Oceanologica Sinica, 35(3):102－107 |
| A quantitative approach to monitoring new sand cay migration in Nansha Islands |
| 南沙群岛新生沙洲变迁模式定量监测方法研究 |
| Received:February 09, 2015 Revised:April 13, 2015 |
| DOI：10.1007/s13131-016-0827-8 |
| Key words:Nansha Islands new sand cay migration pattern remote sensing high resolution linear regression |
| 中文关键词: 南沙群岛 新生沙洲 变迁模式 遥感 高分辨率 线性回归 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | ZHU Haitian | Institute of Remote Sensing and Digital Earth, Chinese Accodemy of Sciences, Beijing 100094, China
National Satellite Ocean Application Service, Beijing 100081, China
Department of Geography & Anthropology, Louisiana State University, Baton Rouge, Louisiana 70803, USA | zht@mail.nsoas.org.cn | | JIANG Xingwei | Institute of Remote Sensing and Digital Earth, Chinese Accodemy of Sciences, Beijing 100094, China
National Satellite Ocean Application Service, Beijing 100081, China | | | MENG Xuelian | Department of Geography & Anthropology, Louisiana State University, Baton Rouge, Louisiana 70803, USA | | | FENG Qian | National Satellite Ocean Application Service, Beijing 100081, China | | | CUI Songxue | National Satellite Ocean Application Service, Beijing 100081, China | | | LIANG Chao | National Satellite Ocean Application Service, Beijing 100081, China | |
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| Abstract: |
| Sand cay is a special kind of islet formed by coral detritus and bioclast, which is common in Nansha Islands of China. Some sand cays play an important role in ocean strategy and economy, but surprisingly we know little about them, especially those recently formed sand cays. In this research, we monitor migration of a new sand cay in Nanxun Jiao (Gaven Reef) using a series of QuickBird and WorldView -2 satellite images between June 2006 and August 2013. We conduct a regression between migration distance and wind observational data to examine the migration patterns of the new sand cay. The migration distance is calculated based on the sand cay locations extracted based on Normalized Difference Water Index (NDWI). The wind observational data downloaded from NOAA are reformed into four wind direction vectors. Based on the results of regression, we concluded that the migration of the new sand cay on Nanxun Jiao was significantly associated with the east, west and north wind. East wind was the main influence factor of the migration; its impact strength was almost twice as the west and north wind. The south wind has little effect on the migration of the sand cay, which is partly blocked by the artificial structure in the south. |
| 中文摘要: |
| 由珊瑚礁碎屑和生物碎屑组成的沙洲是南沙群岛的一类常见的岛礁。虽然这类沙洲在海洋战略和海洋经济中扮演着重要的角色,但是我们仍然对其知之甚少,尤其是对于一些新生沙洲更是连基本资料都十分匮乏。本研究中我们利用一系列QuickBird和WorldView-2数据,在2006年7月至2013年8月期间对南薰礁上一处新生沙洲进行了连续卫星遥感监测。根据这些资料我们对沙洲移动距离和海风观测资料进行了回归分析以确定沙洲的变迁模式。沙洲移动距离是通过NDWI提取沙得到的,海风数据则是从NOAA网站下载并整理而来。基于线性回归结果,我们得出以下结论:该沙洲的移动与东风、西风和北风明显相关,其中东风是沙洲移动的主要影响因素,其影响能力几乎是西风和北风的两倍。而南风由于被沙洲南部的人工建筑阻挡,对该沙洲的移动几乎没有影响。 |
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