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1 edition of The viability of acoustic tomography in monitoring the circulation of Monterey Bay found in the catalog.

The viability of acoustic tomography in monitoring the circulation of Monterey Bay

Miller, James H.

The viability of acoustic tomography in monitoring the circulation of Monterey Bay

  • 318 Want to read
  • 3 Currently reading

Published by Naval Postgraduate School in Monterey, Calif .
Written in English

    Subjects:
  • Ocean circulation,
  • Oceanography,
  • Measurement,
  • TOMOGRAPHY,
  • ACOUSTICS,
  • OCEANS,
  • Underwater acoustics

  • About the Edition

    This report presents the results of a fifteen month study on the viability of acoustic tomography in monitoring the circulation of Monterey Bay, California. The basis for ocean acoustic tomography is the measurement of travel times of coded acoustic signals between the transceivers. The sound speed field and current structure can be inferred from the fluctuations in travel times. However, the extreme bathymetry of the Monterey Submarine Canyon complicates the acoustic transmissions in the Bay. The study consisted of an experiment and a computer modeling effort. The experiment consisted of transmitting tomography signals in the Bay for four days. The signals were received with a sonobuoy- based telemetry system. The experimental effort showed multipath arrivals that were stable and resolvable. The modeling effort involved the use of 2-D and 3-D ray tracing computer programs. The programs had difficulty in modeling the effects of Monterey Bay"s extreme bathymetry making the multipath identification challenging. Progress is expected with the augmentation of the ray tracing programs with Gaussian beam and time front postprocessors. Acoustic tomography, Underwater acoustics.

    Edition Notes

    Other titlesNPS-62-90-003.
    Statementby James H. Miller, Laura L. Ehret, Robert C. Dees and Theresa M. Rowan
    ContributionsRowan, Theresa M., Ehret, Laura L., Dees, Robert C.
    The Physical Object
    Pagination200 p. :
    Number of Pages200
    ID Numbers
    Open LibraryOL25503116M

    This book gives a comprehensive presentation of the underlying oceanography and mathematics necessary to understand and develop a practical system of transmitters and receivers to interpret the behavior of the oceans. It covers the forward and inverse tomography problem, as well as numerous models for data by:


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The viability of acoustic tomography in monitoring the circulation of Monterey Bay by Miller, James H. Download PDF EPUB FB2

This report presents the results of a fifteen month study on the viability of acoustic tomography in monitoring the circulation of Monterey Bay, California.

The basis for ocean acoustic tomography is AU - Miller, James H. AU - Rowan, Theresa M. This report presents the results of a fifteen month study on the viability of acoustic tomography in monitoring the circulation of Monterey Bay, California. The basis for ocean acoustic tomography is the measurement of travel times of coded acoustic signals between the transceivers.

The sound speed field and current structure can be inferred from the fluctuations in the travel times. However, the extreme bathymetry of the Monterey Submarine Canyon complicates the acoustic transmissions.

The viability of acoustic tomography in monitoring the circulation of Monterey Bay / Tomography, Underwater acoustics. Publisher: Monterey, Calif.:Naval Postgraduate School,[].

Author: James H. Miller, Laura L. Ehret, Robert C. Dees, Theresa M. Rowan. The viability of acoustic tomography in monitoring the circulation of Monterey Bay / By James H.

Miller, Robert C. Dees, Laura L. Ehret and Theresa M. Rowan. Topics: ACOUSTICS, Measurement, Monterey Bay (Calif.), Ocean circulation. monitoring the circulation of Monterey Bay, California.

The basis for ocean acoustic tomography is the measmement of travel times of coded acoustic signals between the transceivers. In situ measurements are time-consuming and expensive. However, the ocean is transparent to low frequency acoustic waves. The navies of the world have utilized this fact to detect submarines with sound since 1 Recently, oceanographers and engineers have looked to acoustics for assistance in observing the circulation of the : Robert C.

Dees, James H. Miller, Kevin P. Schaaff, Sönke Paulsen, Ching-Sang Chiu, Laura Ehret, Jame. In particular, the tomographic estimate was compared to the temperature and wind measurements from an in situ mooring deployed by the Monterey Bay Aquarium Research Institution (MBARI).

T Monitoring temperature variability along the California coast using acoustic tomography: The Journal of the Acoustical Society of America: VolNo 5Cited by: 1. The principles of ocean acoustic tomography. Ocean acoustic tomography was introduced by Munk and Wunsch in following a demonstration in the ‘70s that about 99% of the kinetic energy of the ocean circulation is associated with mesoscale features, that is features that are about km in diameter [4].

Coastal acoustic tomography (CAT), an innovational oceanographic technology, which is a coastal sea application of ocean acoustic tomography (OAT), was developed by Hiroshima University in (Kaneko et al., ).The OAT technology was put forward by Munk and Wunsch in as an effective tool for mapping the structure of currents and sound speeds related mainly to temperature over large Cited by: 3.

Recent Progress in the Coastal Acoustic Tomography Arata Kaneko Hiroshima Bay with a complicated coastline. All boundaries, including the open boundaries are closed.

To relax this unnatural constraint, the model domain is taken much wider than the tomography domain. Monitoring Tidal Bores using Acoustic Tomography System. Continuous measurements of flow velocities and suspended sediments were carried out in the Qiantang River.

Data collected simultaneously at Monterey Bay Stations C, E, and S on August 26–27 are typical of the changes observed in the vertical distribution of acoustic volume scattering.

Station E was km inshore of Station C. Station S was km southeast of Station C Cited by: Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection Signal processing and preliminary results in the Monterey Bay Tomography Experiment.

Monitoring temperature variability along the California coast using acoustic tomography The Journal of the Acoustical Society of America( the tomographic estimate was compared to the temperature and wind measurements from an in situ mooring deployed by the Monterey Bay Aquarium Research Institution Cited by: 1.

Ocean acoustic tomography was introduced by Munk and Wunsch [1,2] as a remote-sensing technique for large-scale monitoring of the ocean interior using low-frequency sound.

In their original conception, the method works by measuring the travel times of sound pulses between. Coastal acoustic tomography (CAT), which was developed as a coastal-sea application for ocean acoustic tomography [1,2], still serves as innovative technology for monitoring and predicting variations in the coastal sea environment by data assimilation [3,4,5,6].Mapping rapidly-varying current fields in coastal seas is a remarkable capability of CAT [7,8,9,10,11,12,13].Author: Minmo Chen, Ze-Nan Zhu, Chuanzheng Zhang, Xiao-Hua Zhu, Min Wang, Xiaopeng Fan, Ruixiang Zhao, Ju Li.

This banner text can have markup. web; books; video; audio; software; images; Toggle navigation. During Marcha high-precision experiment for reconstructing the current variation in Dalian Bay (DLB) was successfully conducted by 11 coastal acoustic tomography (CAT) systems.

Monitoring the Kuroshio Extension with Dynamically Constrained Synthesis of the Acoustic Tomography, Satellite Altimeter and in situ Data Article Full-text available.

Highlights The discharge in a river with tidal bores was measured using the coastal acoustic tomography system. The tomography measurement results are in excellent agreement with those from an acoustic Doppler profiler. The results capture the drastic variations of river flow caused by the passage of tidal bores.

The annual discharge can be predicted using the regression relationship Cited by: We have measured perturbation of the sound speed δC(x,y,z) (temperature) field within an ocean volume by repeated acoustic transmissions through the volume along many different ray paths i (Ocean Tomography Group, ).

The data set consisted of ray travel time perturbations δt i, and the sound field was obtained by inverse theory from a linear weighted sum δC(x,y,z)=Σ i A i −1 (x,y,z Cited by: Observing the ocean in the ’s: A strategy for the role of acoustic tomography in ocean climate observation. In: Observing the Oceans in the 21st Century, C.

Koblinsky and N. Smith, eds., GODAE Project Office, Bureau of Meteorology, Melbourne, –Cited by: 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. for conventional ocean acoustic tomography. In spite of complexity of ray structure, travel-time nonreciprocity predicted by the model proposed is in good agreement with numerical results.

Long-Term Observations in Acoustics -- the Ocean Acoustic Observatory Federation Article (PDF Available) in Oceanography (Washington D.C.) 13(2) January.

Technical report for period June - March Estuarine, Coastal and Shelf Science () 15, The Role of Internal Tides in the Nutrient Enrichment of Monterey Bay, Californiaa Russell E. Sheab and William W. Broenkow Moss Landing Marine Laboratories, Moss Landing, CaliforniaU.S.A.

Received 26 May i98r and in revised form 6 October Keywords: internal tides; submarine canyons; divergence; nutrients; Monterey Bay Cited by: Ocean acoustic tomography: a scheme for large scale monitoring There remains the problem of mooring motion at low frequencies, such as those of the mesoscale perturbations themselves.

We believe it is possible to achieve the requirements with very stiff one Cited by: Ocean Acoustic Tomography is a tool with which we can study average temperatures over large regions of the ocean.

By measuring the time it takes sound to travel between known source and receiver locations, we can determine the soundspeed. Changes in. A department of UC San Diego, Scripps Institution of Oceanography is one of the oldest, largest, and most important centers for ocean, earth and atmospheric science research, education, and public service in.

Monterey birds: Status and distribution of birds in Monterey County, California [Roberson, Don] on *FREE* shipping on qualifying offers. Monterey birds: Status and distribution of birds in Monterey County, CaliforniaAuthor: Don Roberson. Photoacoustic imaging is a biomedical imaging modality based on the photoacoustic effect.

In photoacoustic imaging, non-ionizing laser pulses are delivered into biological tissues. Some of the delivered energy will be absorbed and converted into heat, leading to transient thermoelastic expansion and thus wideband ultrasonic emission. The generated ultrasonic waves are detected by ultrasonic transducers and then analyzed to produce images.

It is known that optical absorption. Evaluation of a Passive Acoustic Monitoring Network for Harbor Porpoise to Assess Marine Renewable Projects in California is the final report for the Exploratory Studies of Potential Environmental Issues with Alternative Energy Futures for California project (contract number ) conducted by Moss Landing Marine Laboratories.

Analysis of acoustic signals recorded from the U.S. Navy’s SOund SUrveillance System (SOSUS) was used to detect and locate blue whale (Balaenoptera musculus) calls offshore in the northeast Pacific.

The long, low-frequency components of these calls are characteristic of calls recorded in the presence of blue whales elsewhere in the by: Developing operational oceanographic models for coastal environment is an exciting challenge for the next decades.

The typical sparsity of assimilated in‐situ observations often creates biases in the model predictions reducing the overall accuracy of the forecasting. In such a highly dynamic environment, acoustic tomography can be a good candidate to provide synoptic measurements over wide Cited by: 1.

Masetti, Mayer, L. A., Johnson, P., and Kelley, J. G., “ Leveraging Predictions from NOAA’s Oceanographic Forecast Models to Increase Environmental Variability Awareness in Ocean Mapping ”, American Meteorological Society thMA, Abstract_ Leveraging Predictions from Noaa's Oceanographic Forecast Models to Increase Environmental Variability Awareness in.

Global Position System Autonomous Underwater Vehicle Inertial Navigation System Navigation Accuracy Sound Speed Profile These keywords were added by machine and not by the authors.

This process is experimental and the keywords may be updated as the learning algorithm by: A seamount is a large geologic landform that rises from the ocean floor but that does not reach to the water's surface (), and thus is not an island, islet or nts are typically formed from extinct volcanoes that rise abruptly and are usually found rising from the seafloor to 1,–4, m (3,–13, ft) in height.

They are defined by oceanographers as independent. Evaluation of Acoustic Tomography for Tree Decay Detection Shanqing Liang, Xiping Wang, Janice Wiedenbeck, Zhiyong Cai, and Feng Fu. Abstract. In this study, the acoustic tomography technique was used to detect internal decay in high value black cherry Cited by: 6.

Figure provides a chronology of some important scientific discoveries in atmospheric sciences during the past years overlaid with some observing system milestones. For Fig.seminal papers are called out as milestone events, even though the papers in most cases relied on previous work and work on the topic continued after the papers were by: 1.

The mesopelagic zone (Greek μέσον, middle), also known as the middle pelagic or twilight zone, is the part of the pelagic zone that lies between the photic epipelagic and the aphotic bathypelagic zones.

It is defined by light, and begins at the depth where only 1% of incident light reaches and ends where there is no light; the depths of this zone are between approximately to Other articles where Ocean acoustic tomography is discussed: undersea exploration: Acoustic and satellite sensing: A method known as ocean acoustic tomography, for example, monitors the travel time of sound pulses with an array of echo-sounding systems.

In general, the amount of data collected is directly proportional to the product of the number of transmitters and receivers, so that much.results of monitoring two m2 plots over a period of 42 years within the Monterey Bay National Marine Sanctuary by citizen scientists (trained students and naturalists).

One, the Soquel Point plot, was near a small (~3 million gallons per day) domestic sewage outfall that was discontinued inand the other, the Opal Cliffs plot, was in a.