DOI: 10.1002/2017JF004364
Scopus记录号: 2-s2.0-85041233197
论文题名: Estuarine Channel Evolution in Response to Closure of Secondary Basins: An Observational and Morphodynamic Modeling Study of the Western Scheldt Estuary
作者: Nnafie A. ; VanOyen T. ; DeMaerschalck B. ; vanderVegt M. ; van der Wegen M.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 1 起始页码: 167
结束页码: 186
语种: 英语
英文关键词: channels
; estuaries
; evolution
; lateral displacement
; morphodynamic
; secondary basins
Scopus关键词: basin evolution
; channel morphology
; displacement
; estuarine sediment
; estuary
; modeling
; morphodynamics
; Netherlands
; Westerschelde
英文摘要: The fringes of estuaries are often characterized by the presence of side embayments (secondary basins), with dimensions in the order of hundreds of meters to tens of kilometers. The presence of secondary basins significantly alters the hydrodynamic and sediment characteristics in the main estuary, implying that loss of secondary basin area due to human interventions might affect the estuarine morphodynamics. Analysis of historical bathymetric data of the Western Scheldt Estuary (Netherlands) suggests that closure of its secondary basins has triggered the observed lateral displacement of the nearby channels. This analysis motivated investigation of the impact of secondary basins on decadal evolution of estuarine channels, using the numerical model Delft3D. Model results show that channels that form near a secondary basin are located farther away from the bank of the estuary with respect to their positions in the case without a basin. Overall, results in cases with two or three basins are similar to those in case with one single basin. The wider the basin, the farther away the nearby channel forms. Removing a secondary basin causes a lateral displacement of the nearby channel toward the bank, indicating that the observed lateral displacement of channels in the Western Scheldt is triggered by closure of its secondary basins. The physical explanation is that tidal currents in the main estuary are weaker and more rotary near secondary basins, favoring sediment deposition and shoal development at these locations. Model results are particularly relevant for estuaries with moderate to high friction and converging width. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114731
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Flanders Hydraulics Research, Antwerp, Belgium; IMAU, Utrecht University, Utrecht, Netherlands; IHE, Delft, Netherlands; Deltares, Delft, Netherlands
Recommended Citation:
Nnafie A.,VanOyen T.,DeMaerschalck B.,et al. Estuarine Channel Evolution in Response to Closure of Secondary Basins: An Observational and Morphodynamic Modeling Study of the Western Scheldt Estuary[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(1)