| Observations and analyses of floc size and floc settling velocity in coastal salt marsh of Luoyuan Bay, Fujian Province, China |
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| 作者姓名： | WANG Aijun YE Xiang CHEN Jian |
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| 作者单位： | WANG Aijun(Open Laboratory for Coast and Ocean Environmental Geology, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;Key Laboratory of Ministry of Education for Coast and Island Development, Nanjing University, Nanjing 210093, China);YE Xiang,CHEN Jian(Open Laboratory for Coast and Ocean Environmental Geology, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China) |
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| 基金项目： | The National Natural Science Foundation of China under contract No. 40606012; the Scientific Research Foundation of Third Institute of Oceanography, State Oceanic Administration under contract No. 2009015. |
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| 摘 要： | 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 nearbed 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 μm, and the mean floc sizes (MFS) vary from 30.4 to 69.4 μm. 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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| 关 键 词： | 絮状沉淀 速度分析 中国沿海 罗源湾 福建 沉降速度 盐沼 平均粒径 |
| 收稿时间： | 15 November 2009 |
| 修稿时间： | 2009/12/22 0:00:00 |
Observations and analyses of floc size and floc settling velocity in coastal salt marsh of Luoyuan Bay, Fujian Province, China |
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| WANG Aijun,YE Xiang,CHEN Jian.Observations and analyses of floc size and floc settling velocity in coastal salt marsh of Luoyuan Bay, Fujian Province, China[J].Acta Oceanologica Sinica,2010,29(3):116-126. |
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| Authors: | WANG Aijun YE Xiang and CHEN Jian |
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| Institution: | 1.Open Laboratory for Coast and Ocean Environmental Geology, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;Key Laboratory of Ministry of Education for Coast and Island Development, Nanjing University, Nanjing 210093, China2.Open Laboratory for Coast and Ocean Environmental Geology, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China |
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| Abstract: | 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 nearbed 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/dm3. The mean grain size of constituent grains varies from 7.0 to 9.6μm, and the mean floc sizes (MFS) vary from 30.4 to 69.4 μm. The relationship between the mean floc size and settling velocity can be described as: ws =adb, in which ws 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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| Keywords: | Spartina alterniflora marsh current velocity suspended sediment concentration mean floc size floc settling velocity Luoyuan Bay |
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