DOI: 10.1002/2017JC012857
Scopus记录号: 2-s2.0-85041734057
论文题名: Three-Dimensional Sediment Dynamics in Well-Mixed Estuaries: Importance of the Internally Generated Overtide, Spatial Settling Lag, and Gravitational Circulation
作者: Wei X. ; Kumar M. ; Schuttelaars H.M.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 2 起始页码: 1062
结束页码: 1090
语种: 英语
英文关键词: estuarine turbidity maximum (ETM)
; gravitational circulation
; lateral processes
; salt intrusion
; sediment transport
; well-mixed
Scopus关键词: advection
; concentration (composition)
; estuarine dynamics
; morphodynamics
; oceanic circulation
; saline intrusion
; sediment transport
; sedimentation
; settling velocity
; suspended sediment
; three-dimensional modeling
; turbidity
; Delaware
; United States
英文摘要: To investigate the dominant sediment transport and trapping mechanisms, a semi-analytical three-dimensional model is developed resolving the dynamic effects of salt intrusion on sediment in well-mixed estuaries in morphodynamic equilibrium. As a study case, a schematized estuary with a converging width and a channel-shoal structure representative for the Delaware estuary is considered. When neglecting Coriolis effects, sediment downstream of the estuarine turbidity maximum (ETM) is imported into the estuary through the deeper channel and exported over the shoals. Within the ETM region, sediment is transported seaward through the deeper channel and transported landward over the shoals. The largest contribution to the cross-sectionally integrated seaward residual sediment transport is attributed to the advection of tidally averaged sediment concentrations by river-induced flow and tidal return flow. This contribution is mainly balanced by the residual landward sediment transport due to temporal correlations between the suspended sediment concentrations and velocities at the M2 tidal frequency. The M2 sediment concentration mainly results from spatial settling lag effects and asymmetric bed shear stresses due to interactions of M2 bottom velocities and the internally generated M4 tidal velocities, as well as the salinity-induced residual currents. Residual advection of tidally averaged sediment concentrations also plays an important role in the landward sediment transport. Including Coriolis effects hardly changes the cross-sectionally integrated sediment balance, but results in a landward (seaward) sediment transport on the right (left) side of the estuary looking seaward, consistent with observations from literature. The sediment transport/trapping mechanisms change significantly when varying the settling velocity and river discharge. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114571
Appears in Collections: 气候减缓与适应
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作者单位: Applied Mathematics, Delft University of Technology, Delft, Netherlands; National Oceanography Centre, Liverpool, United Kingdom
Recommended Citation:
Wei X.,Kumar M.,Schuttelaars H.M.. Three-Dimensional Sediment Dynamics in Well-Mixed Estuaries: Importance of the Internally Generated Overtide, Spatial Settling Lag, and Gravitational Circulation[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)