| 长江河口拦门沙河床淤积和泥沙再悬浮过程 |
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| 引用本文： | 李九发,何青,张琛.长江河口拦门沙河床淤积和泥沙再悬浮过程[J].海洋与湖沼,2000,31(1):101-109. |
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| 作者姓名： | 李九发 何青 张琛 |
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| 作者单位： | 华东师范大学河口海岸国家重点实验室,上海,200062 |
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| 基金项目： | “九五”国家重点科技攻关项目!“典型河口冲淤灾害预测技术研究”专题研究成果之一，96－922－03－02号 |
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| 摘 要： | 利用近２０年来长江河口所观测的地形、水文、悬沙和河床沉积物资料，着重对１９８８、１９８９、１９９６和１９９７年最新观测资料进行计算分析。结果表明，长江河口航道拦门沙河段来水沙量大，潮流作用强，潮波变形明显，水流挟沙力强。该河段潮流速随时间和空间变化，又处在盐淡水交换地带，流域和海域来沙在此河率时淤时冲，悬沙与床沙交换频繁，表现在涨急、落急时可床淤积层泥沙再次起动悬浮，憩流时只河床，在一个潮周期中含
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| 关 键 词： | 长江河口 泥沙运动 泥沙再悬浮 河口拦门沙 |
| 收稿时间： | 1998/9/12 0:00:00 |
| 修稿时间： | 9/5/1999 12:00:00 AM |
A STUDY ON SEDIMENT DEPOSITION AND RESUSPENSION IN THE MOUTH BAR AREA OF THE CHANGJIANG RIVER ESTUARY |
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| LI Jiu-f,HE Qing and ZHANG Chen.A STUDY ON SEDIMENT DEPOSITION AND RESUSPENSION IN THE MOUTH BAR AREA OF THE CHANGJIANG RIVER ESTUARY[J].Oceanologia Et Limnologia Sinica,2000,31(1):101-109. |
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| Authors: | LI Jiu-f HE Qing and ZHANG Chen |
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| Institution: | State Key Lab. of Estuarine and Coastal Research, East China Normal University, Shanghai 200062;State Key Lab. of Estuarine and Coastal Research, East China Normal University, Shanghai 200062;State Key Lab. of Estuarine and Coastal Research, East China Normal University, Shanghai 200062 |
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| Abstract: | The mouth bar area in the Changjiang River estuary is well-known for its large water and sediment discharges, strong tidal action, sighificant tidal wave reduction and big sediment carrying capacity. The velocity of tidal currents both with time and space and the area of the mouth bar is the major place for forming the density current of the salt and fresh water. There is an exchange between suspended load and bed load, causing frequency erosion and deposition at the same time. Based on a vast amount of hydrology, sediment and topography data since the 1970s, sediment erosion, deposition and resuspension in the Changjiang River estuary were briefly discussed in this paper. It was found that there were sediment resuspension during the maximum velocity in the ebb and flood tides and sediment deposition between the ebb and flood tides. Generally two peaks and two valleys of sediment concentration occurred during a tidal period. Existence of low unit weight sediments on surface also causes resuspension during turning time of flood and ebb which results in 3-4 concentration peaks within a tidal cycle. The erosion and deposition depth was found to be 0.2m between the spring and neap tides. Sediment resuspention happened in flood seasons and sediment deposition happened in dry seasons with an average depth of 0.6m. |
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| Keywords: | The Changjiang River estuary Sediment transport Sediment resuspension River mouth bar |
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