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  • Columbus Iselin (Ship) Cruise AmasSeds 3  (1)
  • Estuaries  (1)
  • Physical Oceanography  (1)
  • Mixing
  • Shear structure/flows
  • Turbulence
  • 2005-2009  (3)
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  • 1
    Publikationsdatum: 2022-05-25
    Beschreibung: © 2008 The Authors. This is an open-access article distributed under the terms of the Creative Commons Attribution Noncommercial License. The definitive version was published in Environmental Fluid Mechanics 8 (2008): 495-509, doi:10.1007/s10652-008-9107-2.
    Beschreibung: Estuarine turbulence is notable in that both the dissipation rate and the buoyancy frequency extend to much higher values than in other natural environments. The high dissipation rates lead to a distinct inertial subrange in the velocity and scalar spectra, which can be exploited for quantifying the turbulence quantities. However, high buoyancy frequencies lead to small Ozmidov scales, which require high sampling rates and small spatial aperture to resolve the turbulent fluxes. A set of observations in a highly stratified estuary demonstrate the effectiveness of a vessel-mounted turbulence array for resolving turbulent processes, and for relating the turbulence to the forcing by the Reynolds-averaged flow. The observations focus on the ebb, when most of the buoyancy flux occurs. Three stages of mixing are observed: (1) intermittent and localized but intense shear instability during the early ebb; (2) continuous and relatively homogeneous shear-induced mixing during the mid-ebb, and weakly stratified, boundary-layer mixing during the late ebb. The mixing efficiency as quantified by the flux Richardson number Rf was frequently observed to be higher than the canonical value of 0.15 from Osborn (J Phys Oceanogr 10:83–89, 1980). The high efficiency may be linked to the temporal–spatial evolution of shear instabilities.
    Beschreibung: The funding for this research was obtained from ONR Grant N00014-06-1-0292 and NSF Grant OCE-0729547.
    Schlagwort(e): Turbulence ; Estuaries ; Shear instability ; Buoyancy flux
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Woods Hole Oceanographic Institution
    Publikationsdatum: 2022-05-26
    Beschreibung: Thls report includes a compilation of hydrodynamic data obtained in New Bedford Harbor, Massachusetts (Figue 1-1), for the purpose of providing baseline information for the selection of an outfall site for a seondary sewage treatment plant for the city of New Bedford. The observations were conducted by scientists at Woods Hole Oceanographic Institution, commencing in August, 1987 and continuing though March, 1988. They included moored and shipboard measurements of fluid velocity, temperature, salinity, dissolved oxygen and turbidity. The measurement program was designated as the "New Bedford Circulation Study", or NBCS. The study indicates that there are a variety of mechanisms responsible for the transport and exchange of water-masses, of which tidal currents are the most energetic, but wind-driven flows are likely the most effective at renewing the water within the Harbor. Estimates of residence times indicate minimum residence times of less than 2 days during periods of strong winds, and maximum residence times of 4 days or more in periods of weak to moderate south winds. Vertical stratificaton is weak in the winter and moderate in the summer, and it has a notable influence on vertical mixing and on the magnitude of shear currents.
    Beschreibung: Funding was provided by Camp, Dresser and McKee, Inc. under agreement effective 24 August 1987.
    Schlagwort(e): New Bedford Harbor ; Hydrodynamics ; Physical Oceanography
    Repository-Name: Woods Hole Open Access Server
    Materialart: Technical Report
    Format: 5207444 bytes
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2022-05-26
    Beschreibung: A Multidisciplinary Amazon Shelf SEDiment Study (AmasSeds) is a cooperative research program by geological, chemical, physical, and biological oceanographers from Brazil and the United States to study sedimentary processes occurring over the continental shelf near the mouth of the Amazon River. The physical oceanography component of AmasSeds included a moored array deployed on the continental shelf approximately 300km northwest of the Amazon River mouth near 3.5°N. The moored array consisted of a cross-shelf transect of three mooring sites located on the 18-m, 65-m, and 103-m isobaths. The moored array was deployed for approximately 4 months, from early February, 1990 to mid-June, 1990, obtaining time series measurements of current, temperature, conductivity, and wind. This report describes the physical oceanography moored array component and provides a statistical and graphical summary of the moored observations.
    Beschreibung: Funding was provided by the National Science Foundation through Grant Nos. OCE 88-12917 and OCE 91-15712.
    Schlagwort(e): Moored oceanographic observations ; AmasSeds (A Multidisciplinary Amazon Shelf SEDiment Study) ; Columbus Iselin (Ship) Cruise AmasSeds 2 ; Columbus Iselin (Ship) Cruise AmasSeds 3
    Repository-Name: Woods Hole Open Access Server
    Materialart: Technical Report
    Format: 5362313 bytes
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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