| LI Zhanhai,GAO Shu,CHEN Shenliang,WANG Yaping.Grain-size distribution patterns of suspended sediment in response to hydrodynamics on the Dafeng intertidal flat, Jiangsu, China[J].Acta Oceanologica Sinica,2006,(6):63-77 |
| Grain-size distribution patterns of suspended sediment in response to hydrodynamics on the Dafeng intertidal flat, Jiangsu, China |
| Grain-size distribution patterns of suspended sediment in response to hydrodynamics on the Dafeng intertidal flat, Jiangsu, China |
| 投稿时间：2006-07-03 修订日期：2006-10-16 |
| DOI： |
| 中文关键词: grain-size distributions suspended sediment resuspension settling Jiangsu coast |
| 英文关键词:grain-size distributions suspended sediment resuspension settling Jiangsu coast |
| 基金项目: |
| 作者 | 单位 | E-mail | | LI Zhanhai | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | zhli@sklec.ecnu.edu.cn | | GAO Shu | Key Laboratory of Coast and Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China | | | CHEN Shenliang | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | | | WANG Yaping | Key Laboratory of Coast and Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China | |
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| 中文摘要: |
| Patterns of grain-size distributions of suspended sediment in relation to resuspension, settling, and tidal processes are investigated, based on in situ measurements over the Dafeng intertidal flat, on the Jiangsu coast, in the summer of 2002 and 2003.The suspended sediment here is dominated by fine and very fine silt, with a mean grain-size of 7~13 μm.The patterns of the grain-size distributions of suspended sediment during a tidal cycle are characterized by two types:one stable type representing insignificant spatial and temporal variations; and the other bimodal type with significant variations.The main factors influencing the grain-size distributions include resuspension, settling, suspended sediment imported into intertidal flats during the flood phase, and the grain-size distribution of seabed sediment.Resuspension increases the coarse particle content, enhances the mean grain-size of suspended sediment, and results in grain-size distributions for the suspended sediment similar to those of seabed sediment; the settling process has opposite effects on the suspended sediment.When resuspension occurs, the gain-size distributions of suspended sediment in the lower part of water column respond significantly to the current velocity.Where the influence of resuspension and settling processes is weak, the grain-size distributions of suspended sediment appear to be stable and almost identical for the various parts of intertidal flats during different measurement periods.Such distributions are referred to the background grain-size distribution, for which the mean grain-size over the Dafeng intertidal flat is around 7 μm. |
| 英文摘要: |
| Patterns of grain-size distributions of suspended sediment in relation to resuspension, settling, and tidal processes are investigated, based on in situ measurements over the Dafeng intertidal flat, on the Jiangsu coast, in the summer of 2002 and 2003.The suspended sediment here is dominated by fine and very fine silt, with a mean grain-size of 7~13 μm.The patterns of the grain-size distributions of suspended sediment during a tidal cycle are characterized by two types:one stable type representing insignificant spatial and temporal variations; and the other bimodal type with significant variations.The main factors influencing the grain-size distributions include resuspension, settling, suspended sediment imported into intertidal flats during the flood phase, and the grain-size distribution of seabed sediment.Resuspension increases the coarse particle content, enhances the mean grain-size of suspended sediment, and results in grain-size distributions for the suspended sediment similar to those of seabed sediment; the settling process has opposite effects on the suspended sediment.When resuspension occurs, the gain-size distributions of suspended sediment in the lower part of water column respond significantly to the current velocity.Where the influence of resuspension and settling processes is weak, the grain-size distributions of suspended sediment appear to be stable and almost identical for the various parts of intertidal flats during different measurement periods.Such distributions are referred to the background grain-size distribution, for which the mean grain-size over the Dafeng intertidal flat is around 7 μm. |
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