Study on sediment floccules and the influence factors in the North Passage of the Changjiang Estuary

Zhu Wenwu; Li Jiufa; Yao Hongyi; Zhang Xiaohe

doi:10.3969/j.issn.0253-4193.2016.03.009

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Zhu Wenwu, Li Jiufa, Yao Hongyi, Zhang Xiaohe. Study on sediment floccules and the influence factors in the North Passage of the Changjiang Estuary[J]. Haiyang Xuebao, 2016, 38(3): 88-97. doi: 10.3969/j.issn.0253-4193.2016.03.009

Citation:

Zhu Wenwu, Li Jiufa, Yao Hongyi, Zhang Xiaohe. Study on sediment floccules and the influence factors in the North Passage of the Changjiang Estuary[J]. Haiyang Xuebao, 2016, 38(3): 88-97. doi: 10.3969/j.issn.0253-4193.2016.03.009

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Study on sediment floccules and the influence factors in the North Passage of the Changjiang Estuary

doi: 10.3969/j.issn.0253-4193.2016.03.009

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
2.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 2015-06-03
Rev Recd Date: 2015-07-17

Abstract

Abstract

Based on the field observations in April 2012 in the North Passage of the Changjiang Estuary,as well as the data measured with scanning electron microscope,the characteristics of flow and sediment,the micromorphology and size of floccules and the main influence factors in the North Passage were investigated in this paper. The results show that the tidal current velocity,the salinity,the suspended sediment concentration and the sediment particle size in the North Passage are very suitable for flocculation. There are varied forms of floccules,mainly including loose floccules,porous floccules and dense floccules. They are mainly composed of fine silts and clays,with rough surfaces,loose or dense structures. The variations of floccule size are highly related to the flood-ebb process,showing periodic features. The floccule size is big during slacks,but small during peak currents. Usually,the floccule size during high water slacks is bigger than that during low water slacks; the floccule size during neap tides is bigger than that during spring tides. Additionally,the floccule size is gradually increased from the surface to the bottom. The tidal current velocity controls the variations of floccule size. The flocculation of suspended sediment is one of the main reasons for the siltation in the navigation channel of North Passage.
- Changjiang Estuary,
- North Passage,
- tidal current,
- suspended sediment,
- flocculation,
- floccule size

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References(21)

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