Applications of sediment trap in sediment dynamics in coast and shelf seas: A case study of Luoyuan Bay and Taiwan Strait

Wang Aijun; Ye Xiang; Chen Jian; Huang Caibin

doi:10.3969/j.issn.0253-4193.2015.01.013

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Wang Aijun, Ye Xiang, Chen Jian, Huang Caibin. Applications of sediment trap in sediment dynamics in coast and shelf seas: A case study of Luoyuan Bay and Taiwan Strait[J]. Haiyang Xuebao, 2015, 37(1): 125-136. doi: 10.3969/j.issn.0253-4193.2015.01.013

Citation:

Wang Aijun, Ye Xiang, Chen Jian, Huang Caibin. Applications of sediment trap in sediment dynamics in coast and shelf seas: A case study of Luoyuan Bay and Taiwan Strait[J]. Haiyang Xuebao, 2015, 37(1): 125-136. doi: 10.3969/j.issn.0253-4193.2015.01.013

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Applications of sediment trap in sediment dynamics in coast and shelf seas: A case study of Luoyuan Bay and Taiwan Strait

doi: 10.3969/j.issn.0253-4193.2015.01.013

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

Received Date: 2013-12-05
Rev Recd Date: 2014-05-10

Abstract

Abstract

Marine particles contain a lot of information on chemical,physical,biological processes in the interior of the ocean. Using time-series sediment trap for collecting the settling particles estimating the settling fluxes,and analyzing their sources,compositions and temporal and spatial variations and associated controlled factors by comprehensive methods,can provide a new method for the research of sediment dynamic process in coast and shelf seas. Two experiments were carried out in Luoyuan Bay of Fujian Province and inner shelf in northwest Taiwan Strait in July,2012. The estimated settling fluxes of the experiment in Luoyuan Bay by cylinder trap increased from neap tide to spring tide. During the neap tide,the near-bed settling fluxes ranged from 133.20 to 256.18 g/(m²·t),while the values in spring tide ranged from 373.99 to 590.51 g/(m²·t),and the maximum value was 746.34 g/(m²·t) which occurred at the early spring tide with strong effect of typhoon event. The results of grain size analysis and hydrodynamic measurement indicated that the near-bed settling particles originated from surface sediment resuspension. The maximum near-bed settling flux of the experiment in Taiwan Strait by cone trap during the observation was 13.34 g/(m²·d) which occurred at neap tide,while the settling fluxes increased from intermediate tide to neap tide. During the middle-late stage of the measurement,the near-bed thermocline and halocline varied upward and the vertical mixture was enhanced,which led the resuspended sediment diffused upward and increased the settling flux ultimately. These two experimental results indicate that the sediment trap combined with the measurement of bottom boundary layer may play an important role in the research of sediment dynamic processes,sediment record formation and preservation in the muddy deposited system in coast and inner shelf seas.
- sediment trap,
- settling particles,
- settling flux,
- coast and inner shelf seas,
- sediment dynamic

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