Estimation of vertical transport timescales of sediment in the Changjiang Estuary and its adjacent regions

被引:0
作者
Zhu, Lei [1 ,2 ,3 ,4 ]
Zhang, Guang [1 ,2 ,3 ]
Zhang, Heng [1 ,2 ,3 ]
Gong, Wenping [1 ,2 ,4 ]
Li, Shushi [5 ]
机构
[1] Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510275, Peoples R China
[2] Guangdong Prov Key Lab Marine Resources & Coastal, Guangzhou 510275, Peoples R China
[3] Minist Educ, Pearl River Estuary Marine Ecosyst Res Stn, Zhuhai 519082, Peoples R China
[4] Southern Marine Sci & Engn Guangdong Lab, Zhuhai, Guangdong, Peoples R China
[5] Beibu Gulf Univ, Coll Marine Sci, Guangxi Key Lab Marine Environm Change & Disaster, Qinzhou 535011, Peoples R China
基金
中国国家自然科学基金;
关键词
Resuspension age; Sediment transport; Turbidity maximum; Changjiang Estuary; RIVER ESTUARY; TURBIDITY MAXIMUM; MODEL; RESUSPENSION; TURBULENCE; STRATIFICATION; DYNAMICS; BAY; INTRUSION; DIAGNOSIS;
D O I
10.1016/j.jhydrol.2024.131326
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The concept of resuspension age was employed to assess the timescales of vertical sediment transport in the Changjiang Estuary (CJE) and its adjoining areas. Resuspension age refers to the duration elapsed since particles last made contact with the seabed. Energetic tidal current in the study area results in a significant amount of sediment being eroded into the water during spring tides, causing the resuspension age to consistently remain lower during spring tides compared to neap tides. Spatially, consistently low resuspension ages occur in the North Branch and turbidity maximum because suspended sediment in these areas primarily originates from local erosion. While advective sediment dominates in the HZB, leading to highest resuspension age there. During the wet season, the South Branch experiences an average resuspension age surpassing 10 days, primarily due to particles predominantly transported from the river. Sediments deposited on the seabed during the wet season become the primary source of suspended sediment after being eroded into the water column during the dry season, leading to a reduction in resuspension age. Likewise, the decrease in resuspension age in the Subei Coast during the dry season is closely associated with the appearance of sediment mass advected by the northern branch plume. When stratification occurs, the upward diffusion of sediment is impeded, constraining newly eroded sediment close to the bed. As a result, these sediments exhibit lower ages than those in the upper water column, where sediment transport is primarily dominated by horizontal advection.
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页数:12
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