DOI: 10.1002/2016GL068796
论文题名: Lagrangian flow measurements and observations of the 2015 Chilean tsunami in Ventura, CA
作者: Kalligeris N. ; Skanavis V. ; Tavakkol S. ; Ayca A. ; Safty H.E. ; Lynett P. ; Synolakis C.
刊名: Geophysical Research Letters
ISSN: 0094-9624
EISSN: 1944-9355
出版年: 2016
卷: 43, 期: 10 起始页码: 5217
结束页码: 5224
语种: 英语
英文关键词: coherent structures
; currents
; early warning
; ports and harbors
; tsunami
Scopus关键词: Flow measurement
; Ocean currents
; Ports and harbors
; Channel bifurcation
; Coherent structure
; Early warning
; Quantitative measurement
; Substantial energy
; Turbulent coherent structures
; Turbulent structures
; Vortical structures
; Tsunamis
英文摘要: Tsunami-induced coastal currents are spectacular examples of nonlinear and chaotic phenomena. Due to their long periods, tsunamis transport substantial energy into coastal waters, and as this energy interacts with the ubiquitous irregularity of bathymetry, shear and turbulent features appear. The oscillatory character of a tsunami wave train leads to flow reversals, which in principle can spawn persistent turbulent coherent structures (e.g., large vortices or “whirlpools”) that can dominate damage and transport potential. However, no quantitative measurements exist to provide physical insight into this kind of turbulent variability, and no motion recordings are available to help elucidate how these vortical structures evolve and terminate. We report our measurements of currents in Ventura Harbor, California, generated by the 2015 Chilean M8.3 earthquake. We measured surface velocities using GPS drifters and image sequences of surface tracers deployed at a channel bifurcation, as the event unfolded. From the maps of the flow field, we find that a tsunami with a near-shore amplitude of 30 cm at 6 m depth produced unexpectedly large currents up to 1.5 m/s, which is a fourfold increase over what simple linear scaling would suggest. Coherent turbulent structures appear throughout the event, across a wide range of scales, often generating the greatest local currents. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978842696&doi=10.1002%2f2016GL068796&partnerID=40&md5=28148611fdff8876fbf89ed9bcf69d6f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10587
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA, United States
Recommended Citation:
Kalligeris N.,Skanavis V.,Tavakkol S.,et al. Lagrangian flow measurements and observations of the 2015 Chilean tsunami in Ventura, CA[J]. Geophysical Research Letters,2016-01-01,43(10).