HY-1C Observations of the Impacts of Islands on Suspended Sediment Distribution in Zhoushan Coastal Waters, China
1
Marine science and technology College, Zhejiang Ocean University, Zhoushan 316022, China
2
National Satellite Ocean Application Service (NSOAS), Beijing 100081, China
3
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangdong Key Laboratory of Ocean Remote Sensing (LORS), State Key Laboratory of Tropical Oceanography (LTO), South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(11), 1766; https://doi.org/10.3390/rs12111766
Received: 16 April 2020
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Revised: 19 May 2020
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Accepted: 27 May 2020
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Published: 30 May 2020
We analyzed the impacts of islands on suspended sediment concentration (SSC) in Zhoushan Coastal waters based on data from HY-1C, which was launched in September 2018 in China, carrying Coastal Zone Imager (CZI) and Chinese Ocean Color and Temperature Scanner (COCTS) on it for offshore observation. A new SSC retrieved model was established based on the relationship between in situ SSC and the reflectance in red and near infrared bands of CZI image. Fifteen CZI images obtained from October to December 2019 were applied to retrieve SSC in Zhoushan coastal waters. The results show that SSC in study area is 100–1600 mg·L−1. The SSC near islands changes obviously. Upstream of the islands, SSC is lower than downstream. During the flood and ebb, when the current passes through the islands, circumfluence will appear, under certain geophysical factors, generating Karman vortex streets downstream of the islands. The sediments were stirred by the fast speed current at the outer side of vortex street to the sea surface inducing higher SSC at the outer side of the vortex street, while the central sediments of the vortex street were lower. In the direction of ocean currents, the SSC of the vortex street downstream of islands is changing regularly, i.e., increasing, then decreasing and increasing again and then decreasing in a snaking vortex street whose length downstream is between 1000 and 8000 m long.
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Keywords:
HY-1C; suspended sediment concentration; islands; vortex street
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MDPI and ACS Style
Cai, L.; Zhou, M.; Liu, J.; Tang, D.; Zuo, J. HY-1C Observations of the Impacts of Islands on Suspended Sediment Distribution in Zhoushan Coastal Waters, China. Remote Sens. 2020, 12, 1766. https://doi.org/10.3390/rs12111766
AMA Style
Cai L, Zhou M, Liu J, Tang D, Zuo J. HY-1C Observations of the Impacts of Islands on Suspended Sediment Distribution in Zhoushan Coastal Waters, China. Remote Sensing. 2020; 12(11):1766. https://doi.org/10.3390/rs12111766
Chicago/Turabian StyleCai, Lina, Minrui Zhou, Jianqiang Liu, Danling Tang, and Juncheng Zuo. 2020. "HY-1C Observations of the Impacts of Islands on Suspended Sediment Distribution in Zhoushan Coastal Waters, China" Remote Sensing 12, no. 11: 1766. https://doi.org/10.3390/rs12111766
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