| WAN Xinning,LI Jiufa,SHEN Huanting. 2009. Distribution and fluxes of suspended sediments in the offshore waters of the Changjiang (Yangtze) Estuary. Acta Oceanologica Sinica, (4):86－95 |
| Distribution and fluxes of suspended sediments in the offshore waters of the Changjiang (Yangtze) Estuary |
| Distribution and fluxes of suspended sediments in the offshore waters of the Changjiang (Yangtze) Estuary |
| Received:May 21, 2008 Revised:December 02, 2008 |
| DOI： |
| Key words:Changjiang Estuary offshore waters suspended sediment distribution flux |
| 中文关键词: Changjiang Estuary offshore waters suspended sediment distribution flux |
| 基金项目:The Science and Technology Commission of Shanghai Municipality Point Project under contract No. 07DJ14003. |
| Author Name | Affiliation | E-mail | | WAN Xinning | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
Shanghai Waterway Engineering Design and Consulting Co. LTD, Shanghai 200120, China | wanxinning@sina.com | | LI Jiufa | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | | | SHEN Huanting | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | |
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| Abstract: |
| The offshore waters of the Changjiang Estuary are the transitional areas where river-supplied water and sediment are transported to the sea, and material exchanges occur with the neighbored Hangzhou Bay and the Jiangsu waters. Field observations of currents and sediment properties were conducted to study temporal and spatial distributions of suspended sediments under various dynamical conditions. The high sediment concentrations were found to occur in the western and southern waters of the offshore, and the low concentrations occurred in the eastern and northern waters. This pattern of the suspended sediment concentration (SSC) distribution is obviously influenced by the runoff and tidal current. The significant difference of along-estuary SSC distribution indicates that the SSC is reduced gradually from the west to the east, and that in the spring tide is obviously higher than in the neap tide. The methods of mechanism analysis and equal-area grids were used to calculate the suspended sediment fluxes at the typical cross sections. It was found that 44 percent of total suspended sediments from the Changjiang River were deposited in the submarine delta, and more than 27 percent of sediments were transported southernly into the Hangzhou Bay, and only 9 percent of sediments was supplied and exchanged with the northern Jiangsu waters, and about 20 percent of sediments was delivered offshore to the sea. |
| 中文摘要: |
| The offshore waters of the Changjiang Estuary are the transitional areas where river-supplied water and sediment are transported to the sea, and material exchanges occur with the neighbored Hangzhou Bay and the Jiangsu waters. Field observations of currents and sediment properties were conducted to study temporal and spatial distributions of suspended sediments under various dynamical conditions. The high sediment concentrations were found to occur in the western and southern waters of the offshore, and the low concentrations occurred in the eastern and northern waters. This pattern of the suspended sediment concentration (SSC) distribution is obviously influenced by the runoff and tidal current. The significant difference of along-estuary SSC distribution indicates that the SSC is reduced gradually from the west to the east, and that in the spring tide is obviously higher than in the neap tide. The methods of mechanism analysis and equal-area grids were used to calculate the suspended sediment fluxes at the typical cross sections. It was found that 44 percent of total suspended sediments from the Changjiang River were deposited in the submarine delta, and more than 27 percent of sediments were transported southernly into the Hangzhou Bay, and only 9 percent of sediments was supplied and exchanged with the northern Jiangsu waters, and about 20 percent of sediments was delivered offshore to the sea. |
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