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1 edition of Basin-scale tidal measurements using acoustic tomography found in the catalog.

Basin-scale tidal measurements using acoustic tomography

Robert Hugh Headrick

Basin-scale tidal measurements using acoustic tomography

by Robert Hugh Headrick

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Published by Available from the National Technical Information Service in Springfield, Va .
Written in English

    Subjects:
  • Tomography

  • About the Edition

    Travel-times of acoustic signals were measured between a bottom-mounted source near Oahu and four bottom-mounted receivers located near Washington Oregon, and California in 1988 and 1989, This paper discusses the observed tidal signals. At three out of four receivers, observed travel times at M2 and S2 periods agree with predictions from barotropic tide models to within ±30° in phase and a factor of 1.6 in amplitude. The discrepancy at the fourth receiver can be removed by including predicted effects of phase-locked baroclinic tides generated by seamounts. Our estimates of barotropic M2 tidal dissipation by seamounts vary between 2 x 10¹ and 1x10¹ erg·s¹. The variation by two orders of magnitude is due to uncertainties in the numbers and sizes of seamounts. The larger dissipation (1x10¹ erg·s¹) is the same order as previous estimates and amounts to 4% of the tota

    Edition Notes

    Statementby Robert Hugh Headrick
    ContributionsMassachusetts Institute of Technology
    The Physical Object
    Pagination47 leaves :
    Number of Pages47
    ID Numbers
    Open LibraryOL25487436M
    OCLC/WorldCa84943702

    amplitude, but large-scale signal that may extracted from the noisy ocean environment using acous-tic tomography. The analogy here is that these diurnal internal tides are to the internal-wav e noise as the climate patterns are to the mesoscale noise. b. Basin Scale Studies Monitoring the Western Mediterranean basin (THETIS-II). C. Flagg, S. Smith: On the use of the acoustic Doppler current profiler to measure zooplankton abundance, Deep-Sea Res. 36, – () CrossRef Google Scholar A. Gargett: Velcro measurement of turbulence kinetic energy dissipation rate ε, J. Atmos. Ocean.

    Abstract An acoustic source and receiver are placed at m depth and are separated by km in a two-layer, steady-wind driven, flat bottom eddy-resolving quasi-geostrophic circulation model. T. Analysis of multipath acoustic field variability and coherence for the finale of broadband basin-scale transmissions in the North Pacific Ocean. J. Acoust. Soc. Theory of acoustic measurement of internal wave strength as a function of depth, horizontal position, and time. J. Geophys. Ocean acoustic tomography: A scheme for large scale.

    The basin scale Climate variability Some experimental considerations A brief historical review Low-frequency propagation at very long ranges Refracted geodesics Spheroidal caustics Mode stripping and repopulation Basin reverberation The future of basin-scale tomography --Epilogue: The. Munk W.H., et Wunsch C. (). “Ocean acoustic tomography: a scheme for large scale Stéphan Y., and Evennou F. () “Analysis of tomographic signals to retrieve tidal parameters”, Proceedings of the 2 nd Evennou F., Martin-Lauzer F.R. () Acoustic Modeling and Measurements in the Bay of Biscay in a Double SOFAR Channel.


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Basin-scale tidal measurements using acoustic tomography by Robert Hugh Headrick Download PDF EPUB FB2

Basin-ScaleTidalMeasurementsusingAcoustic Tomography by RobertHughHeadrick ,OklahomaStateUniversity() Submittedinpartialfulfillmentofthe requirementsforthedegreesof OCEANENGINEER and MASTEROFSCIENCEINOCEANENGINEERING atthe MASSACHUSETTSINSTITUTEOFTECHNOLOGY andthe. We measure travel-times of acoustic signals between a bottom-mounted source near Oahu and four bottom-mounted receivers located near Washington, Oregon, and California in and (Figure ).

The power-spectra of basin-scale travel-times exhibit prominent variability at tidal periods [Spiesberger et al., b]. Coastal Acoustic Tomography begins with the specifics required for designing a Coastal Acoustic Tomography (CAT) experiment and operating the CAT system in coastal seas.

Following sections discuss the procedure for data analyses and various application examples of CAT to coastal/shallow seas (obtained in various locations). Purchase Coastal Acoustic Tomography - 1st Edition. Print Book & E-Book. ISBN  An updated perspective on basin-scale tomography The Journal of the Acoustical R.

Spindel, J. Colosi, K. Metzger, T. Birdsall, and A. Baggeroer, “ A test of basin-scale acoustic thermometry using a large-aperture vertical array at km range in and P.

Bushong, “ Tidal signals in basin-scale acoustic transmissions Cited by: The travel times of acoustic pulses transmitted in opposite directions over a ‐km Basin-scale tidal measurements using acoustic tomography book in mid‐ocean have been used to measure the fields of sound.

A data assimilation technique was applied to analyze the first coastal acoustic tomography data, obtained in the Neko‐Seto Channel of the Seto Inland Sea, Japan on. Acoustic tomography is proving very useful for monitoring straits as well (Denmark Strait, Fram Strait, Strait of Gibraltar).

Acoustic tomography has also been implemented for basin scales in the ocean to detect very large scale warming or cooling (Acoustic Thermometry of Ocean Climate. In the present study, water discharge in a shallow tidal channel, which is m wide and ~3 m deep, was continuously measured using a new river acoustic tomography (RAT) system.

the northeast Pacific Ocean to precisely measure basin-scale ocean temperatures using long-range acoustic trans-missions. Dushaw et al.

[] compared the decade-long time series of acoustic travel times measured over – Mm range paths to equivalent time series calculated using several global ocean simulations or state estimates.

The horizontal distribution of tidal currents was measured by coastal acoustic tomography (CAT). The velocity measured by CAT had the highest precision thus far owing to the largest number of transmission rays.

The sensitivity experiment suggests a cost-optimal CAT measurement scheme. Coastal acoustic tomography data with four separate ray paths are analyzed for two period bands (a) > 6 h and (b) 10 min-6 h. • The 3-h oscillation is dominant in band (b) and has an amplitude comparable to the semidiurnal tidal current in band (a).

[1] Long‐term variations of streamflow in a tidal channel were measured using a Fluvial Acoustic Tomography (FAT) system through one transmission path.

FAT is an innovative acoustic technology that utilizes the time‐of‐travel method to determine velocity between two points from multiple ray paths that traverse the entire cross‐section of stream. Worcester, P. F., Dushaw, B. and Howe, B. (in press) ‘Gyre-scale current measurements using reciprocal acoustic transmissions’, Proceedings of the Fourth IEEE Working Conference on Current Measurement, Clinton, MD.

April 3–5, Google Scholar. To measure the current in the QS, we carried out a day experiment using coastal acoustic tomography (CAT) systems (Kaneko et al.,Yamaguchi et al., ) that do not disturb shipping traffic, fisheries, or marine aquaculture.

To the best of our knowledge, this study is the first synchronous measurement that separates the major tidal. The first Chinese coastal acoustic tomography (CAT) experiment was successfully carried out during July 12 to 13, with seven acoustic stations for mapping the tidal currents in the Zhitouyang.

The first Chinese coastal acoustic tomography (CAT) experiment for mapping the tidal currents in Zhitouyang Bay near Zhoushan Island was successfully performed with seven acoustic stations from. Ocean acoustic tomography is a technique used to measure temperatures and currents over large regions of the ocean.

On ocean basin scales, this technique is also known as acoustic thermometry. The technique relies on precisely measuring the time it takes sound signals to travel between two instruments, one an acoustic source and one a receiver, separated by ranges of – km.

If the. Acoustic tomography is a technique for measuring large-scale ocean temperature and current using acoustic signals propagating over –1, km distances. The technique relies on the nature of the oceanic sound speed profile, which acts as an acoustic waveguide, and the transparency of the ocean to low-frequency sound.

[1] The Kanmon Strait acoustic tomography data acquired at a 5‐min interval are assimilated sequentially into a 2D ocean model on the basis of the ensemble Kalman filter scheme to image strong tidal current structures occurring in the strait.

When the accurate range‐averaged currents obtained for the sound transmission lines connecting eight tomography stations are used as. Coastal acoustic tomography (CAT) has been well developed as a coastal sea application of ocean acoustic tomography [1][2][3].

Intensive field measurements by CAT have been performed in coastal.Eight sets of coastal acoustic tomography (CAT) systems were deployed during November 29 to Decem at the coasts on both sides of Tokyo Bay to measure tidal .Satellite altimetry and acoustic tomography are complementary for this purpose 1, as the former provides detailed horizontal coverage of the surface, and the latter the requisite vertical sampling.