Citation: | LI Jue, QIAO Lulu, LE DucCuong, XUE Wenjing, YANG Hongda, WANG Yongzhi, YAO Zhigang. Surficial distribution of suspended sediment in Beibu Gulf of the South China Sea[J]. Marine Geology & Quaternary Geology, 2020, 40(2): 10-18. doi: 10.16562/j.cnki.0256-1492.2019021301 |
The study of surficial suspended matter based upon remote sensing is not accurate enough in Beibu Gulf, especially in the western part of the Gulf, due to location constraint. In addition, the data on seasonal variation in suspended sediment concentration (SSC) is lacking in the area. In this paper, a retrieval algorithm for surficial suspended sediment concentration was established by analyzing the images from the MODIS-Aqua satellite in the years from 2003-2017 and the in situ measured data from the Gulf, and thus the distribution of surficial SSC in Beibu Gulf is revealed and carefully studied. The results suggest that the main high-value areas of the surficial suspension are located along the coast of Guangxi, the west side of Hainan Island and the Red River Delta. Under the influence of fluvial sediment transport and ocean dynamics, SSC are higher in winter and summer rather than other seasons in the coastal areas, and reaches the lowest in spring. The transit of tropical cyclones will lead to the increase in SSC. SSC on the west side of Leizhou Peninsula increased by 75% compared with the multi-year average owing to the transit of tropical storm Bebinca.
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Map of Beibu Gulf
Comparison between in-situ data and MODIS derived data for Beibu Gulf
Monthly surficial suspended sediment concentration in Beibu Gulf from 2003 to 2017
Average monthly surficial SSC in Beibu Gulf
Variation of surficial SSC and average wind field conditions (e) in the selected sections (a, b, c, d) of Beibu Gulf with time
Distribution of surficial suspended sediment in Beibu Gulf in June 2013 (a) and its difference from average annual mean in June (b)
The sediment concentration in the Balat estuaries on the 15th of each month in 2009 and the SSC distribution of each month at site a
Average monthly sediment concentration at the lower reaches of the Changhua river[25] and the SSC distribution of each month at site b