期刊
ACTA OCEANOLOGICA SINICA
卷 29, 期 3, 页码 116-126出版社
SPRINGER
DOI: 10.1007/s13131-010-0043-x
关键词
Spartina alterniflora marsh; current velocity; suspended sediment concentration; mean floc size; floc settling velocity; Luoyuan Bay
类别
资金
- National Natural Science Foundation of China [40606012]
- Scientific Research Foundation of Third Institute of Oceanography, State Oceanic Administration [2009015]
In coastal environments, fine-grain sediments often aggregate into large and porous flocs. ElectroMagnetic Current Meters (EMCM) and Laser In Situ Scattering and Transmissometry (LISST-ST) have been deployed within a Spartina alterniflora marsh of the Luoyuan Bay in Fujian Province, China, to measure the current velocity, the floc size and the settling velocity between 15 and 22 January 2008. During the observations, the near-bed water was collected in order to obtain the suspended sediment concentration (SSC) and constituent grain size. Data show that: (1) the near-bed current velocities vary from 0.1 to 5.6 cm/s in the central Spartina alterniflora marsh and 0.1-12.5 cm/s at the edge; (2) the SSCs vary from 47 to 188 mg/dm(3). The mean grain size of constituent grains varies from 7.0 to 9.6 mu m, and the mean floc sizes (MFS) vary from 30.4 to 69.4 mu m. The relationship between the mean floc size and settling velocity can be described as: w(s)=ad(b), in which w(s) is the floc settling velocity (mm/s), a and b are coefficients. The floc settling velocity varies from 0.17 to 0.32 mm/s, with a mean value of 0.26 mm/s, and the floc settling velocity during the flood tide is higher than that during the ebb tide. The current velocity and the SSC are the main factors controlling the flocculation processes and the floc settling velocity.
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