A quantitative approach to monitoring new sand cay migration in Nansha Islands

ZHU Haitian; JIANG Xingwei; MENG Xuelian; FENG Qian; CUI Songxue; LIANG Chao

doi:10.1007/s13131-016-0827-8

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Article Navigation > Acta Oceanologica Sinica > 2016 > 35(3): 102-107

ZHU Haitian, JIANG Xingwei, MENG Xuelian, FENG Qian, CUI Songxue, LIANG Chao. A quantitative approach to monitoring new sand cay migration in Nansha Islands[J]. Acta Oceanologica Sinica, 2016, 35(3): 102-107. doi: 10.1007/s13131-016-0827-8

Citation:

ZHU Haitian, JIANG Xingwei, MENG Xuelian, FENG Qian, CUI Songxue, LIANG Chao. A quantitative approach to monitoring new sand cay migration in Nansha Islands[J]. Acta Oceanologica Sinica, 2016, 35(3): 102-107. doi: 10.1007/s13131-016-0827-8

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A quantitative approach to monitoring new sand cay migration in Nansha Islands

doi: 10.1007/s13131-016-0827-8

1.
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
2.
Institute of Remote Sensing and Digital Earth, Chinese Accodemy of Sciences, Beijing 100094, China;National Satellite Ocean Application Service, Beijing 100081, China
3.
Department of Geography & Anthropology, Louisiana State University, Baton Rouge, Louisiana 70803, USA
4.
National Satellite Ocean Application Service, Beijing 100081, China

Received Date: 2015-02-09
Rev Recd Date: 2015-04-13

Abstract

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.
- Nansha Islands,
- new sand cay,
- migration pattern,
- remote sensing,
- high resolution,
- linear regression

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References(18)

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