The Influence of A Cross‐Reef Channel On the Wave‐Driven Setup and Circulation at Ipan, Guam
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Le résumé fourni par la source
Abstract 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.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- The Influence of A Cross‐Reef Channel On the Wave‐Driven Setup and Circulation at Ipan, Guam
- Date Crossref
- 01/07/2020
- Éditeur
- American Geophysical Union (AGU)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Hawaii System Department of Oceanography pays non établi dans la noticeUniversité ou école supérieure
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University of California Current affiliation: National Center for Ecological Analysis and Synthesis pays non établi dans la noticeUniversité ou école supérieure
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National Center for Ecological Analysis and Synthesis pays non établi dans la noticeOrganisation à but non lucratif
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Scripps Institution of Oceanography pays non établi dans la noticeStructure de recherche
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University of California San Diego pays non établi dans la noticeUniversité ou école supérieure
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Department of Oceanography University of Hawaii Honolulu HI USA pays non établi dans la noticeUniversité ou école supérieure
Department of Oceanography — University of Hawaii System, Current affiliation: National Center for Ecological Analysis and Synthesis — University of California et National Center for Ecological Analysis and Synthesis, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.