Surface Sediment in the Nearby Shelf of the Yangtze River：Change and Causes

YANG Yun-ping; LI Yi-tian; SUN Zhao-hua; DENG Jin-yun

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YANG Yun-ping, LI Yi-tian, SUN Zhao-hua, DENG Jin-yun. Surface Sediment in the Nearby Shelf of the Yangtze River：Change and Causes[J]. Acta Sedimentologica Sinica, 2014, 32(5): 863-872.

Citation:

YANG Yun-ping, LI Yi-tian, SUN Zhao-hua, DENG Jin-yun. Surface Sediment in the Nearby Shelf of the Yangtze River：Change and Causes[J]. Acta Sedimentologica Sinica, 2014, 32(5): 863-872.

Surface Sediment in the Nearby Shelf of the Yangtze River：Change and Causes

1.
Wuhan University, State Key Laboratory of Water Resources & Hydropower Engineering Science, Wuhan 430072;
2.
Key Laboratory of Engineering Sediment, Tianjin Research Institute for Water Transport Engineering, Ministry of Transport, Tianjin 300456

Received Date: 2013-08-05
Rev Recd Date: 2013-12-01
Publish Date: 2014-10-10

Abstract

The transportation to a sea of sediment with water founds the linkage mechanism of from "source" to "sink" and the response of surface sediment characteristics in the nearby shelf to factors of incoming sediment from the watershed. Take the response of the surface sediment in the offshore area of the Yangtze River to the characteristics of the incoming sediment from the watershed for example. Results showed that: ①for median grain size, it was large in the east and north while small in the west and south. Silt percentage decreased from northeast to southwest while silt and clay showed trends of increasing from northeast to southwest. And the ratio of clay percentage to silt percentage in the whole area was 0.12~0.83. ②compared to that in 2003~2006, sand percentage in 2008~2011 rose while silt and clay percentages showed trends of dropping, and surface sediment tended to be larger. ③The north part (north of 31°31') of the sand-silt boundary changed alternately during 2003~2007, shifted to the west during 2007~2010 while the south part (south of 31°31') shifted to the west for the whole period of 2003~2010. The shift of the boundary was mainly caused by the deposition of sandy sediment from sea area on argillaceous sediment, with diffusion deposition playing a secondary role. ④The argillaceous zone shrank after the impoundment of the Three Gorges and shifted slightly to the south, which was mainly influenced by the training works and natural factors.
- surface sediment,
- trends and causes,
- sand-silt boundary,
- the argillaceous zone,
- nearby shelf,
- Yangtze River Estuary,

References

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Surface Sediment in the Nearby Shelf of the Yangtze River：Change and Causes

1. Wuhan University, State Key Laboratory of Water Resources & Hydropower Engineering Science, Wuhan 430072;

2. Key Laboratory of Engineering Sediment, Tianjin Research Institute for Water Transport Engineering, Ministry of Transport, Tianjin 300456

Received Date: 2013-08-05

Rev Recd Date: 2013-12-01

Publish Date: 2014-10-10

Key words:

Abstract: The transportation to a sea of sediment with water founds the linkage mechanism of from "source" to "sink" and the response of surface sediment characteristics in the nearby shelf to factors of incoming sediment from the watershed. Take the response of the surface sediment in the offshore area of the Yangtze River to the characteristics of the incoming sediment from the watershed for example. Results showed that: ①for median grain size, it was large in the east and north while small in the west and south. Silt percentage decreased from northeast to southwest while silt and clay showed trends of increasing from northeast to southwest. And the ratio of clay percentage to silt percentage in the whole area was 0.12~0.83. ②compared to that in 2003~2006, sand percentage in 2008~2011 rose while silt and clay percentages showed trends of dropping, and surface sediment tended to be larger. ③The north part (north of 31°31') of the sand-silt boundary changed alternately during 2003~2007, shifted to the west during 2007~2010 while the south part (south of 31°31') shifted to the west for the whole period of 2003~2010. The shift of the boundary was mainly caused by the deposition of sandy sediment from sea area on argillaceous sediment, with diffusion deposition playing a secondary role. ④The argillaceous zone shrank after the impoundment of the Three Gorges and shifted slightly to the south, which was mainly influenced by the training works and natural factors.

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Reference (46)

[1]	周晓静. 东海陆架细颗粒沉积物组成分布特征及其物源指示[D]. 青岛:中国科学院海洋研究所, 2009:27-113[Zhou Xiaojing. The source and composition of fine-grained sediment deposited on the East China Sea Shelf[D]. Qingdao: Institute of Oceanology, Chinese Academy of Sciences, 2009: 27-113]
[2]	黄亮, 张国森, 吴莹, 等. 东海内陆架表层沉积物中黑碳的分布及来源[J]. 地球与环境, 2012, 40(1):63-69[Huang Liang, Zhang Guosen, Wu Ying, et al. Distribution and source of black carbon in the surface sediment of the inner continental of the East China Sea[J]. Earth and Environment, 2012, 40(1): 63-69]
[3]	于培松, 薛斌, 潘建明, 等. 长江口和东海海域沉积物粒径对有机质分布的影响[J]. 海洋学研究, 2011, 29(3):202-208[Yu Peisong, Xue Bin, Pan Jianming, et al. Impact of sediment grain size on the distribution of organic matter in Changjiang River Estuary and East China Sea[J]. Journal of Marine Sciences, 2011, 29(3): 202-208]
[4]	王华新, 线微微. 长江口表层沉积物有机碳分布及其影响因素[J]. 海洋科学, 2011, 35(5):24-31[Wang Huaxin, Xian Weiwei. Distribution of the total organic carbon of surface sediment and its influence factors in the Yangtze River Estuary[J]. Marine Sciences, 2011, 35(5): 24-31]
[5]	章伟艳, 金海燕, 张富元, 等. 长江口—杭州湾及其邻近海域不同粒级沉积物有机碳分布特征[J]. 地球科学进展, 2009, 24(11):1202-1209[Zhang Weiyan, Jin Haiyan, Zhang Fuyuan, et al. Organic carbon distribution in the Yangtze River Estuary-Hangzhou Bay and its adjacent sea area[J]. Advances in Earth Science, 2009, 24(11): 1202-1209]
[6]	Lu X X, Song J M, Yuan H M, et al. Grain-size related distribution of nitrogen in the southern Yellow Sea surface sediments[J]. Chinese Journal of Oceanology and Limnology, 2005, 23(3): 306-316
[7]	何会军, 于志刚, 姚庆祯, 等. 长江口及毗邻海区沉积物中磷的分布特征[J]. 海洋学报, 2009, 31(5):19-30[He Huijun, Yu Zhigang, Yao Qingzhen, et al. Distribution of phosphorus in sediments from the Changjiang Estuary and its adjacent sea[J]. Acta Oceanologica Sinica, 2009, 31(5): 19-30]
[8]	杨世纶. 长江口沉积物粒度参数的统计规律及其沉积动力学解释[J]. 泥沙研究, 1994(3):23-31[Yang Shilun. Statistic features for grain-size parameters of the Yangtze River Estuary and their hydrodynamic explanation[J]. Journal of Sediment Research, 1994(3): 23-31]
[9]	刘红, 何青, 王元叶, 等. 长江口表层沉积物粒度时空分布特征[J]. 沉积学报, 2007, 25(3):445-455[Liu Hong, He Qing, Wang Yuanye, et al. Temporal and spatial characteristics of surface sediment grain-size distribution in Changjiang Estuary[J]. Acta Sedimentologica Sinica, 2007, 25(3): 445-455]
[10]	陈沈良, 严肃庄, 李玉中. 长江口及其邻近海域表层沉积物分布特征[J]. 长江流域资源与环境, 2009, 18(2):152-156[Chen Shenliang, Yan Suzhuang, Li Yuzhong. Characteristics of surface sediment distribution in the Yangtze Estuary and its adjacent waters[J]. Resources and Environment in the Yangtze Basin, 2009, 18(2): 152-156]
[11]	董爱国, 翟世奎, ZABEL Matthias, 等. 长江口及邻近海域表层沉积物中重金属元素含量分布及其影响因素[J]. 海洋学报, 2009, 31(6):54-68[Dong Aiguo, Zhai Shikui, ZABEL Matthias, et al. The distribution of heavy metal contents in surface sediments of the Changjiang Estuary in/china and surrounding coastal areas[J]. Acta Oceanologica Sinica, 2009, 31(6): 54-68]
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Surface Sediment in the Nearby Shelf of the Yangtze River：Change and Causes

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