| 长江口北槽柱状沉积物粒度分布特征及沉积环境指示意义 |
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| 引用本文： | 邓智瑞,何 青,邢超锋,郭磊城,王宪业.长江口北槽柱状沉积物粒度分布特征及沉积环境指示意义[J].海洋科学,2016,40(1):112-122. |
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| 作者姓名： | 邓智瑞 何 青 邢超锋 郭磊城 王宪业 |
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| 作者单位： | 华东师范大学 河口海岸学国家重点实验室,华东师范大学 河口海岸学国家重点实验室,华东师范大学 河口海岸学国家重点实验室,华东师范大学 河口海岸学国家重点实验室,华东师范大学 河口海岸学国家重点实验室 |
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| 基金项目： | 国家自然科学基金项目(41276080, 51320105005); 水利部公益项目(201201070-03) |
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| 摘 要： | 为了研究长江口北槽深水航道的泥沙回淤机制及来源,通过对长江口北槽深水航道中部南、北导堤两侧坝田区域所采浅钻柱状样的沉积物特征、粒度参数特征、粒度成分和沉积速率特征等的分析,探讨北槽深水航道水动力条件和泥沙沉积环境。结果显示,柱状样以黏土质粉砂为主,受径流和潮汐作用,分选性都较差,偏态均为正偏,北导堤和南导堤两侧柱状样的分选系数、偏态和峰态在同一侧相互之间的特征较一致,且三组分组成接近;南北导堤异侧之间的粒度特征差异较为明显,北导堤一侧的平均粒度比南导堤的小,北导堤坝田附近的柱状样粒级百分比在垂向上波动变化较大,南导堤则表现的较为单一;南北导堤的敏感组分主要集中在粒级100μm部分。结合资料和测年数据,综合得出,由于北导堤和南导堤的涨落潮不对称,导致了其粒度特征上的不同;北槽淤积中的流域供沙逐渐减少,泥沙来源逐渐转变为滩槽交换供沙为主;北槽受深水航道工程影响巨大,泥沙沉积过程复杂,还需深入研究。
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| 关 键 词： | 长江口 北槽 沉积 柱状样 粒度 |
| 收稿时间： | 1/4/2015 12:00:00 AM |
| 修稿时间： | 2015/5/26 0:00:00 |
Sediment depositional characteristics of North Passage in the Yangtze River Estuary |
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| DENG Zhi-rui,HE Qing,XING Chao-feng,GUO Lei-cheng and WANG Xian-ye.Sediment depositional characteristics of North Passage in the Yangtze River Estuary[J].Marine Sciences,2016,40(1):112-122. |
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| Authors: | DENG Zhi-rui HE Qing XING Chao-feng GUO Lei-cheng and WANG Xian-ye |
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| Institution: | State Key Laboratory of Estuarine and Coastal Research, East China Normal University,State Key Laboratory of Estuarine and Coastal Research, East China Normal University,State Key Laboratory of Estuarine and Coastal Research, East China Normal University,State Key Laboratory of Estuarine and Coastal Research, East China Normal University and State Key Laboratory of Estuarine and Coastal Research, East China Normal University |
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| Abstract: | We got the sediment depositional process information by analyzed some grain size parameters such as mean grain size, components, standard deviations, sedimentation rates, and discussed the hydrodynamic and depositional environment of the north passage in Yangtze River Estuary. The results showed that, clayey silt was major constituent, the sorts of the sediments are all poor and skewness is positive due to the strong influence of the action of runoff and tide. The cores skewness and kurtosis coefficients relatively appeared consistent characteristics on the same side either the North Jetty or South jetty but the distinction between North and South was evident as a result of discriminate hydrodynamics. The mean grain size of North Jetty was smaller than South Jetty and the three components was similar in both sides, nevertheless the grading curve that in North Jetty changes vertical are more substantial than South Jetty. 100 micron grain size was the sensitive component in both sides. Based on the document to date and isotope dating, we known that sediment source of North-South Jetty was consistent, most of which are not from river basin, and due to tidal asymmetrical, North Jetty and South Jetty had difference in grain-size characteristics. Under the deep-water channel project impact, sediment deposition process was complex therefore more in-depth study was required. |
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| Keywords: | Yangtze River Estuary North Passage sediment depositional core sediments grain size |
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