| Interpreting grain-size trends associated with bedload transport on the intertidal flats at Dafeng, central Jiangsu coast |
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| 作者姓名： | JIA Jianjun WANG Yaping GAO Shu WANG Aijun LI Zhanhai |
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| 作者单位： | [1]Key Laboratory of Submarine Geo-Sciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China [2]Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China [3]Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China [4]State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200092, China |
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| 摘 要： | IN THE MARINE ENVIRONMENT, IT IS OFTEN DIFFICULT TO IDENTIFY THE NET SEDIMENT TRANSPORT PATHWAY BECAUSE OF THE COMPLICATED HYDRODYNAMICS AND SEDIMENT SOURCES. GAO AND COLLINS HAVE RE-EXAMINED A 1-D MODEL ORIGI- NALLY DERIVED BY MCLAREN AND BOWLES AND DEVE…
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| 关 键 词： | 底沙搬运 粒度 深海边界层 潮间坪 江苏 大丰市 |
| 收稿时间： | 2005-02-03 |
| 修稿时间： | 2005-02-032005-07-22 |
Interpreting grain-size trends associated with bedload transport on the intertidal flats at Dafeng, central Jiangsu coast |
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| JIA Jianjun WANG Yaping GAO Shu WANG Aijun LI Zhanhai.Interpreting grain-size trends associated with bedload transport on the intertidal flats at Dafeng, central Jiangsu coast[J].Chinese Science Bulletin,2006,51(3):341-351. |
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| Authors: | Jianjun Jia Yaping Wang Shu Gao Aijun Wang Zhanhai Li |
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| Institution: | (1) Key Laboratory of Submarine Geo-Sciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou, 310012, China;(2) Ministry of Education on Key Laboratory for Coast and Island Development, Nanjing University, Nanjing, 210093, China;(3) Third Institute of Oceanography, State Oceanic Administration, Xiamen, 361005, China;(4) State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200092, China |
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| Abstract: | A MIDAS-400 customized data acquisition system has been used for the high-resolution sediment dynamic measurements over the
Dafeng intertidal flats of northern Jiangsu during 6 tidal cycles from July 3 to July 10, 2003. The bed shear stress and bedload
transport rates, in response to wave-current interactions, are calculated, which indicate that wind waves enhance the bottom
shear stress and bedload transport rates. At the station for measurements, bedload transport was directed to seaward, with
a sediment discharge of 30–150 kg·m-1 per tidal cycle. The surficial sediment samples were collected from a grid with 10 m spatial intervals over a rectangle 2
× 104 m2 experimental area, near the MIDAS-400 during the spring tide of July 4, 2003, and the neap tide of July 9, 2003. In addition,
leveling survey was undertaken to obtain the detailed topography of the sampling area. Grain-size trend analysis of the sediment
samples shows that the bedload transport patterns are complex, mainly controlled by the hydrodynamics and local geomorphology
(e.g. tidal creeks) over the intertidal flats. Furthermore, the grain-size trends pattern during the neap tide rather than
during the spring tide is consistent with the calculated bedload transport, and the grain-size trend vectors for the spring
tide are larger than those for the neap tide, indicating that the sampling thickness of surficial sediment during the neap
tide may contain the information on the geomorphological evolution (or sediment deposition/erosion) from the spring to the
neap tide. |
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| Keywords: | intertidal flats grain-size trends benthic boundary layer bedload transport Jiangsu coast |
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