DOI: 10.1029/2017JC013422
Scopus记录号: 2-s2.0-85052543890
论文题名: The Influence of Tide and Wind on the Propagation of Fronts in a Shallow River Plume
作者: Rijnsburger S. ; Flores R.P. ; Pietrzak J.D. ; Horner-Devine A.R. ; Souza A.J.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 8 起始页码: 5426
结束页码: 5442
语种: 英语
英文关键词: density stratification
; in situ data
; plume fronts
; Reynolds stresses
; river plume
; ROFI
英文摘要: In this study we used field data and radar images to investigate the influence of winds and tides on the propagation of tidal plume fronts. The measurements were collected in a shallow shelf region off the Dutch coast, 10 km north of the Rhine River mouth, and they clearly show the passage of distinct freshwater lenses and associated fronts at the surface that propagate all the way to the coastline. These fronts are observed as a sudden drop in near-surface salinity, accompanied by high cross-shore shear with onshore velocities at the surface. We determined the arrival time to our measurement site, frontal propagation speed, and structure of the fronts by combining the in situ data and radar images. Frontal Froude numbers show a wide range of values, with an average of 0.44. Our results show that fronts during spring tides are thinner, more mixed, and move faster relative to the ground during calm spring tides when compared to calm neap tides. Downwelling winds during spring tides result in thicker and faster fronts; however, the intrinsic frontal propagation speed indicates that the wind and tide control the frontal propagation mainly due to advection rather than by changing the frontal structure. Strong return currents in the near-bed layer resulting from fast and thick fronts increase near-bed turbulence and bed stresses. These high stresses suggest that the passage of fronts in shallow coastal areas can initiate sediment resuspension and contribute to transport processes. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113365
Appears in Collections: 气候减缓与适应
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作者单位: Department of Hydraulic Engineering, Delft University of Technology, Delft, Netherlands; Department of Civil and Environmental Engineering, University of Washington, Seattle, WA, United States; Departamento de Obras Civiles, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile; CINVESTAV, Mérida, Mexico
Recommended Citation:
Rijnsburger S.,Flores R.P.,Pietrzak J.D.,et al. The Influence of Tide and Wind on the Propagation of Fronts in a Shallow River Plume[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(8)