| 长江口-杭州湾毗连海区的现代沉积速率 |
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| 引用本文： | 夏小明,杨辉,李炎,李伯根,潘少明.长江口-杭州湾毗连海区的现代沉积速率[J].沉积学报,2004,22(1):130-135. |
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| 作者姓名： | 夏小明 杨辉 李炎 李伯根 潘少明 |
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| 作者单位： | 国家海洋局海底科学重点实验室,第二海洋研究所,杭州,310012;南京大学海岸与海岛开发教育部重点实验室,南京,210093;国家海洋局海底科学重点实验室,第二海洋研究所,杭州,310012;中国海洋大学海洋环境学院,山东青岛,266003;厦门大学海洋环境科学教育部重点实验室,福建厦门,361005;国家海洋局海底科学重点实验室,第二海洋研究所,杭州,310012;南京大学海岸与海岛开发教育部重点实验室,南京,210093 |
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| 基金项目： | 国家自然科学基金
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浙江省自然科学基金
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国家海洋局青年海洋科学基金 |
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| 摘 要： | 运用沉积地层同位素210 Pb、137Cs测年技术,估算长江口 杭州湾毗连海区的现代沉积速率。研究结果表明,以泗礁水道为界,东侧的马鞍列岛区受外海高盐水的顶托,长江来沙少,淤积缓慢;西侧至长江口、杭州湾海岸交汇点 (南汇咀 )之间水域,是长江泥沙扩散南下的主要通道。其中,受长江冲淡水次级锋和杭州湾锋面输沙影响的湾口浅滩区,沉积速率约 3cm/a;洋山港区,水深大于 20m的峡道区,受强动力作用而处于侵蚀状态,峡道两端出口的浅水区,沉积速率为0.3～ 1.6cm/a;马迹山港区,位于典型的峡道沿岸淤泥质陡坡,其沉积过程不稳定,正常沉积速率为 0.7～ 3.4cm/a,但常有快速淤积和地层滑塌流失现象发生.
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| 关 键 词： | 现代沉积速率 时空分布 长江口-杭州湾 |
| 文章编号： | 1000-0550(2004)01-0130-06 |
| 收稿时间： | 2002-11-05 |
| 修稿时间： | 2002年11月5日 |
Modern Sedimentation Rates in the Contiguous Sea Area of Changjiang Estuary and Hangzhou Bay |
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| XIA Xiao ming , YANG Hui , LI Yan LI Bo gen PAN Shao ming.Modern Sedimentation Rates in the Contiguous Sea Area of Changjiang Estuary and Hangzhou Bay[J].Acta Sedimentologica Sinica,2004,22(1):130-135. |
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| Authors: | XIA Xiao ming YANG Hui LI Yan LI Bo gen PAN Shao ming |
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| Institution: | 1.Key Lab of Submarine Geosciences, Second Institute of Oceanography, Hangzhou 310012;2.Key Lab of Coast and Island Development, Nanjing University, Nanjing 210093;3.Key Lab of Marine Environment Science, Xiamen University, Xiamen Fujian 361005;4.College of Marine Environment, Chinese Ocean University, Qingdao Shandong 266003 |
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| Abstract: | Using the 210 Pb and 137 Cs dating methods in the sediment cores, the modern sedimentation rates in the contiguous sea area of Changjiang estuary and Hangzhou bay are estimated. The data show the obvious spatial distribution of sedimentation. To the east of the Shijiao Channel, less Changjiang's sediment inputs lead to the lower sedimentation rates because of the intrusion of high salinity water. To the west of the Shijiao Channel, the sea area between Changjiang estuary and Hangzhou bay is the main passage of the Changjiang's sediment southward diffusion. In the shoal area at the mouth of Hangzhou bay, the sedimentation rate reaches 3cm/a because of the sediment transportation effects of Changjiang estuarine plume and the Hangzhou tidal front. In the sea area of the Yangshan Port, the tidal channel with more than 20m waterdepth is being eroded while the shallow areas off the tidal channel accumulate slowly with 0.3～1.6cm/a. In the Majishan Port, which is located at a muddy slope along the the typical tidal channel, the sedimentation process is unstable. Although the normal sedimentation rate is 0.7 3.4cm/a, rapid accumulation and slipping of subbottom layer also frequently occur. |
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| Keywords: | modern sedimentation rate distribution Changjiang Estuary and Hangzhou Bay |
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