Sediment sources and transport patterns in the southwest Taiwan Strait in spring

WANG Ai-jun; CHEN Jian; YE Xiang; HUANG Cai-bin; WANG Wei-guo; LAI Zhi-kun; HU Yi; LI Yun-hai

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Article Navigation > Haiyang Xuebao > 2010 > 32(6): 130-143

WANG Ai-jun, CHEN Jian, YE Xiang, HUANG Cai-bin, WANG Wei-guo, LAI Zhi-kun, HU Yi, LI Yun-hai. Sediment sources and transport patterns in the southwest Taiwan Strait in spring[J]. Haiyang Xuebao, 2010, 32(6): 130-143.

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Sediment sources and transport patterns in the southwest Taiwan Strait in spring

Open Laboratory for Coast & Ocean Environmental Geology, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

Received Date: 2010-04-05
Rev Recd Date: 2010-08-20

Abstract

Abstract

The Taiwan Strait is a narrow passage connecting the broad and shallow East China Sea to the deep South China Sea, with multiple sources and various transport patterns of sediments (including suspended matter and bedload). A comprehensive investigation has been carried out in the southwest Taiwan Strait in April and May 2005, at 627 stations with SD204 CTD, Seapoint turbidity and fluorescence profiling and collected surfacial sediment. Sediment samples were analyzed by using Mastersizer 2000 laser particle size analyzer (a product of Malvern, UK), and ELEMENTOR varioEL III element analyzer (a product of ELEMENTOR). Then sediment grain sizes, carbon and nitrogen contents were obtained. The results show that the southwest Taiwan Strait water is affected by the coastal currents along Guangdong, the diluted water from the Hanjiang River and Jiulong River and the mixed water of the Taiwan Strait. The coastal currents along Guangdong coasts decrease northward. The diluted water from Hanjiang River transports towards the northeast, which is controlled by seasonal southwest winds. The sediment transports offshore from coasts but onshore from the deep continental area. Thus, a sediment sink center is observed between the southern Shanwei coast and the southeastern Nan'ao Island, in which the terrestrial source dominates. The bedload transport pattern is controlled by the local hydrodynamics and suspended matter settling. The fluorescence of suspended sediment is low at early stage of the upwelling formation in spring. However, the upwelling plays an important role in the sediment transport processes.
- Taiwan Strait,
- suspended matter,
- sediment,
- grain size trends analysis,
- transport process

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