气候变化领域集成服务门户(CCPortal): The Influence of A Cross-Reef Channel On the Wave-Driven Setup and Circulation at Ipan, Guam

CCPortal

DOI	10.1029/2019JC015722
	The Influence of A Cross-Reef Channel On the Wave-Driven Setup and Circulation at Ipan, Guam
	Clark S.J.; Becker J.M.; Merrifield M.A.; Behrens J.
发表日期	2020
ISSN	21699275
卷号	125 期号:7
英文摘要	The influence of a deep (30 m), narrow (30 m) cross-shore channel on the circulation and wave-induced setup over a shallow (∼0.5 m) and wide (∼400 m) shore-attached fringing reef is examined using field measurements collected at Ipan, Guam. Mean currents on the reef flat over a 7-week study period during mid and high tides when the reef is submerged are directed toward the channel with the alongshore component of the current increasing with proximity to the channel. The cross-shore component of the reef flat current is directed onshore at the sensors in the far-field of the channel with a weak offshore flow at the current meter located closest to the channel (∼760 m to the north). Low-frequency fluctuations of the alongshore reef flat current and offshore channel current are significantly correlated and with the incident significant wave height. Mean and low-frequency fluctuating currents are forced by the spatially variable wave-driven setup, modulated by tidal elevation, which creates a pressure gradient over the reef flat due to the channel where waves do not break. The dominant alongshore momentum balance on the reef flat is between the pressure gradient and bottom stress, with an inferred drag coefficient of CD ∼ 0.01. A simple analytical model is presented that is consistent with the observations and delineates the near- and far-field of the channel as a function of the aspect ratio of the reef. Observations from a longer deployment of channel currents are highly correlated with incident wave height in distinct tidal level bands. ©2020. The Authors.
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/186812
作者单位	Department of Oceanography, University of Hawaii, Honolulu, HI, United States; Current affiliation: National Center for Ecological Analysis and Synthesis, University of California Santa BarbaraCA, United States; Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA, United States; Department of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, CA, United States
推荐引用方式 GB/T 7714	Clark S.J.,Becker J.M.,Merrifield M.A.,et al. The Influence of A Cross-Reef Channel On the Wave-Driven Setup and Circulation at Ipan, Guam[J],2020,125(7).
APA	Clark S.J.,Becker J.M.,Merrifield M.A.,&Behrens J..(2020).The Influence of A Cross-Reef Channel On the Wave-Driven Setup and Circulation at Ipan, Guam.Journal of Geophysical Research: Oceans,125(7).
MLA	Clark S.J.,et al."The Influence of A Cross-Reef Channel On the Wave-Driven Setup and Circulation at Ipan, Guam".Journal of Geophysical Research: Oceans 125.7(2020).