气候变化领域集成服务门户(CCPortal): Simulations of the Surf Zone Eddy Field and Cross-Shore Exchange on a Nonidealized Bathymetry

CCPortal

DOI	10.1029/2020JC016619
	Simulations of the Surf Zone Eddy Field and Cross-Shore Exchange on a Nonidealized Bathymetry
	O'Dea A.; Kumar N.; Haller M.C.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	X-band radar observations from the 2017 Inner Shelf Dynamics Experiment (ISDE) in central California show multiple persistent and pulsatory rip currents on a relatively straight coastline with alongshore-varying bathymetry. Although past studies have assessed the characteristics of transient rip currents on alongshore uniform beaches, the relative balance of transient versus steady rip current behavior on nonuniform beaches in realistic wave conditions remains poorly understood. Here, a phase-resolving Boussinesq-type wave model (funwaveC) is used to assess the role of alongshore-varying bathymetry and incident conditions in controlling mean and transient surf zone vorticity and velocity fields and their effect on surf zone exchange. The model simulates wave conditions chosen from the ISDE observations and utilizes both an alongshore-varying bathymetry estimated from the ISDE radar observations and a uniform bathymetry. Results show that the variable bathymetry significantly increases the alongshore- and time-averaged kinetic energy but that this increase is primarily due to the increase in the standing component resulting from mean circulation patterns, with only small changes in the transient component. A variable bathymetry also increases the spectral energy of surf zone vorticity and time-averaged vorticity forcing at large spatial scales (>100 m). Wave directional spreading has a large impact on the alongshore- and time-averaged enstrophy and on the spectral energy of surf zone vorticity and vorticity forcing at smaller spatial scales (<100 m). In the presence of a directionally spread wavefield, an alongshore-varying bathymetry slightly increases the total exchange velocity but has little effect on its transient component. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Boussinesq wave modeling; nearshore processes; nearshore remote sensing; rip currents; surf zone eddies; surf zone exchange
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186345
作者单位	School of Civil and Construction Engineering, Oregon State University, Corvallis, OR, United States; Department of Civil and Environmental Engineering, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	O'Dea A.,Kumar N.,Haller M.C.. Simulations of the Surf Zone Eddy Field and Cross-Shore Exchange on a Nonidealized Bathymetry[J],2021,126(5).
APA	O'Dea A.,Kumar N.,&Haller M.C..(2021).Simulations of the Surf Zone Eddy Field and Cross-Shore Exchange on a Nonidealized Bathymetry.Journal of Geophysical Research: Oceans,126(5).
MLA	O'Dea A.,et al."Simulations of the Surf Zone Eddy Field and Cross-Shore Exchange on a Nonidealized Bathymetry".Journal of Geophysical Research: Oceans 126.5(2021).