| 长江口九段沙现代潮滩沉积特征 |
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| 引用本文： | 谢小平,王兆印,沈焕庭.长江口九段沙现代潮滩沉积特征[J].沉积学报,2005,23(4):566-573. |
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| 作者姓名： | 谢小平 王兆印 沈焕庭 |
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| 作者单位： | 清华大学水利系,北京,100084;曲阜师范大学资源与规划学院,山东,曲阜,273165;清华大学水利系,北京,100084;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： | 科技部科研项目
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国家自然科学基金
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曲阜师范大学校科研和教改项目 |
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| 摘 要： | 根据2003年对长江河口九段沙潮间带和潮上带的现场调查和室内对沉积构造、粒度分布、矿物组成、沉积速率等的分析,对九段沙现代潮滩的沉积特征进行了研究。研究表明九段沙潮间带以小型交错层理为主,波痕发育,粒度主要为细砂至粗粉砂;潮上带主要为水平层理,粒度主要为中细粉砂。潮间带和潮上带的沉积矿物组成非常接近。沉积速率以潮间带低而潮上带高为特点。
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| 关 键 词： | 长江口 九段沙 现代潮滩 沉积特征 |
| 文章编号： | 1000-0550（2005）04-0566-08 |
| 收稿时间： | 2005-01-19 |
| 修稿时间： | 2005-05-20 |
Sedimentary Characteristics of the Modern Tidal Flat of Jiuduansha Shoal in Changjiang Estuary |
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| XIE Xiao-ping,WANG Zhao-yin,SHEN Huan-ting.Sedimentary Characteristics of the Modern Tidal Flat of Jiuduansha Shoal in Changjiang Estuary[J].Acta Sedimentologica Sinica,2005,23(4):566-573. |
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| Authors: | XIE Xiao-ping WANG Zhao-yin SHEN Huan-ting |
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| Institution: | 1.Department of Hydraulic aod Hydro-electrical Engineering, Tsinghua University, Beijing 100084;2.School of Resources and Planning, Qufu Normal University, Qufu, Shandong 273165;3.State Key Lab of Estuarine and Coastal Sediment Dynamics and Morphodynamics, East China Normal University, Shanghai 200062 |
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| Abstract: | Based on the field surveys in 2003 and laboratory analysis of the samples which taken from Jiuduansha Shoal, the sedimentary structure, grain size distribution, assemblages of the clay minerals and the sedimentation rates are studied as well. The sedimentation rate is determined by ^210Pb method, and the results show that the sedimentation rate of the supratidal zone is much higher than that in the inter-tidal zone. The intertidal zone of the Jiuduansha shoal are mainly micro-wave and cross bedding, and sediments are dust-color fine sand and coarse silt, this zone is affected by the wave and tidal currents, some special sedimentary structure formed, and boulder clay, ripple and erosion ridge existed, these structure formed under wave processes. Supratidal zone are mainly horizontal bedding, and sediments are mainly middle-fine silt, because of dominant species are Phramites australis and Scirpus mariqueter on the supratidal zone, here is the lower energy sedimentary environment, and sedimentary structure are horizontal bedding, and mean size is between 5.0-7.0~. Clay minerals are similar between inter-tidal zone and supratidal zone, clay minerals mainly are illite, montmorillonite, kaolinite and chlorite, but they content on supratidal and intertidal zone are different. The sedimentation rate on the intertidal zone are 0.735cm/a, and on the supratidal zone, the sedimentation rate are 3. 342 cm/a, higher than that on the intertidal zone. |
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| Keywords: | Yangtze River Jiuduansha shoal modem tidal flat sedimentary characteristics |
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