| 摘要: |
| 根据1982年4月－1983年3月长江口南槽3个站位全年逐月大潮的水化学成分、悬沙粒度与粘土矿物资料，1984－1992年在环形水槽中获得的近百个组次的动水絮凝沉降试验研究资料，以及长江口细颗粒泥沙、浮泥与底质研究成果，对拦门沙形成过程及其机理进行综合研究。结果表明，长江口拦门沙为最年轻的活动三角洲，汛期集中输水输沙与台湾暖流同期相遇，为动水絮凝沉降最强和浮泥最为发育时期；涨潮期当盐度为（9－13）×10-3时，伊利石、高岭石在盐水楔顶部发生动水絮凝沉降，而落潮期当盐度在（19—24）×10-3时，蒙脱石在盐水楔尾部发生动水絮凝沉降，揭示了拦门沙水平淤积的基本规律；半月周期的浮泥透镜体所残积的中、粗粉沙形成钻孔中常见的透镜体与薄层理，则揭示了拦门沙的垂直加积的基本规律，为拦门沙综合治理与深水航道的开发利用提供科学依据。 |
| 关键词: 长江口 拦门沙 细颗粒泥沙 动水絮凝沉降 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，0924号 |
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| THE RELATIONSHIP BETWEEN FLOCCULATING SETTLEMENT IN FLOWING WATER AND DEPOSITION IN THE CHANGJIANG RIVER ESTUARY MOUTH BAR AREA |
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Zhang Zhizhong, Ruan Wen jie, Jiang Guojun
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Estuary And Harbor Research Division, Hangzhou University, Hangzhou 310028
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| Abstract: |
| Based on the water chemical components, the suspended grain size and clay minerals data in the Changjiang River Estuary South Channel, every springtide from April, 1983 to March, 1984, and about a hundred flocculating settlement test data on flowing water, which were undertaken in the circle water channel from 1984 to 1992, and the results of study on the fine sediments, fluid mud and bottom sediments, the forming process and mechanism of mouth bar were comprehensively studied. It was shown that the mouth bar is the youngest active delta in the Changjiang River Estuary during 'the flood season, while the area where the Changjiang runoff and Taiwan warm current meet off the Changjiang Estuary was the strongest flocculating settlement and most active fluid mud development. The illites and kaolinites are flocculated and deposited at the salt water wedgehead where the water salinity is about 9 ×10-3 - 13×10-3 during flood time and the montmorillionites are flocculated and deposited in the salt water wedgetail where the water salinity is about 19×10-3 - 24 ×10-3 during the ebb time, which show the essential regularities of the horizontal deposition in the mouth bar area. The fluid mud lens which grows and declines in a semi-month cycle produces a coarse and medium silt relic lens and beddings, which show the essential regularities of vertical ccumultion in Changjing River Estury mouth bar are. The above findings provide the scientific base for the comprehensive mangement and deep waterway desingand uses of mouth bar. |
| Key words: Changjiang River Estuary, Mouth bar, Fine sediments, Flocculation settlement in flowing water |
