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Wednesday, July 29, 2020 | History

2 edition of Three dimensional acoustic effects in the Middle Atlantic Bight found in the catalog.

Three dimensional acoustic effects in the Middle Atlantic Bight

by Anthony F. D"Agostino

  • 86 Want to read
  • 5 Currently reading

Published by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


About the Edition

Under the sponsorship of the Office of Naval Research (ONR) PRIMER program, an integrated acoustic and oceanographic field experiment will be conducted jointly by the Naval Postgraduate School (NPS) and the Woods Hole Oceanographic Institution (WHOl) in the Middle Atlantic Bight (MAB) to study the propagation of sound from the continental slope to the continental shelf. In support of this field study the three-dimensional (3D) effects of the basic mean shelfbreak frontal thermal structure and sloping bathymetry on the planned tomography signal transmissions are modeled using ray methods. Both three-dimensional (3D) and two-dimensional (2D) ray paths and signal arrival structures for an upslope and cross-slope source-receiver geometry are simulated and compared. While the input sound speed field is from a previous summer-time hydrographic section, the input bathymetry is from a recently declassified U.S. Navy DBDB-0.5 data set. Significant 3D environmental effects are found in the modeled cross-slope transmissions, indicating that the physics of horizontal refraction and out-of-the-vertical-plane scattering will be required to properly analyze the acoustic measurements and to construct accurate tomographic maps.

Edition Notes

Statement Anthony F. D"Agostino
The Physical Object
Pagination42 p. ;
Number of Pages42
ID Numbers
Open LibraryOL25265168M

ONR Shallow-Water experiment in the Middle Atlantic Bight (SW06) (Tang et al., ), and acoustic modeling has been three-dimensional (3D) modeling of sound propagation through simulated We have quantified many first -order acoustic effects from these waves over the last decade or so. Because many of these effects are not described by. 3) Measurements and analysis of the received levels in the East Greenwich waterfront activities using an advanced sound level meter. (3 hours + 1 hour of travel to and from the site) 4) Estimate the effects of distance, nearby topography and structures on the sound levels at residences based on accepted acoustic modeling paradigms.

continental shelf is a complex problem. The effects on the acoustic field, as one progresses from the slope onto the shelfbreak, is a research issue of concern. In the winter of , a field survey was conducted on the continental slope and shelfbreak south of Cape Cod, MA, in the Middle Atlantic Bight to address this problem.   Pursuant to the urgent need for this knowledge for the U.S. Atlantic and Gulf of Mexico, we integrated 23 years of aerial and shipboard cetacean surveys, linked them to environmental covariates obtained from remote sensing and ocean models, and built habitat-based density models for 26 species and 3 multi-species guilds using distance sampling.

southern Mid-Atlantic in relation to warming temperature. Nickerson, K, T. M. Grothues, K. W. Able. Sensitivity of a time series to guild construction: A case study for the Mullica River-Great Bay Ecosystem BOOK REVIEWS Grothues, T. M. Book review. The first year in the life of Estuarine Fishes in the Middle Atlantic Bight. An Introduction to Acoustics S.W. Rienstra & A. Hirschberg Eindhoven University of Technology 7 July This is an extended and revised edition of IWDE


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Three dimensional acoustic effects in the Middle Atlantic Bight by Anthony F. D"Agostino Download PDF EPUB FB2

An illustration of an open book. Books. An illustration of two cells of a film strip. Video An illustration of an audio speaker. An illustration of a " floppy disk.

Software. An illustration of two photographs. Images. An illustration of a heart shape Donate An illustration of text ellipses. Three dimensional acoustic effects in the Pages: Three dimensional acoustic effects in the Middle Atlantic.

Three dimensional acoustic effects in the Middle Atlantic Bight. By Anthony F. D'Agostino. In support of this field study the three-dimensional (3D) effects of the basic mean shelfbreak frontal thermal structure and sloping bathymetry on the planned tomography signal transmissions are modeled using ray methods.

Both three-dimensional (3D Author: Anthony F. D&#;Agostino. Significant three-dimensional (3-D) environmental variability exists in the vicinity of the shelf break along the mid-Atlantic Bight.

This study examines the influence of azimuthal coupling due to this variability on acoustic propagation in this region. Numerical studies employing a 3-D ray code, a hybrid ray-mode code, and a 3-D parabolic equation model are Cited by: 4. Nitrogen cycling in the Middle Atlantic Bight: Results from a three‐dimensional model and implications for the North Atlantic nitrogen budget Weiwei Shou, Haibo Zong, Pingxing Ding, Lijun Hou, A modelling approach to assess the effects of atmospheric nitrogen deposition on the and Yellow Sea: a three-dimensional physical Cited by:   1.

Introduction. During life fish may travel considerable distances for different purposes (Lucas and Baras ; Brönmark et al. ).Migratory movement is a fundamental characteristic of fishes, with strong impacts on their ecology and population size (Hugh Dingle and Drake ).Migratory movements in rivers are often blocked or obstructed by the presence of.

A recent set of experiments sponsored by the Office of Naval Research has been conducted in the vicinity of the Mid‐Atlantic Bight shelf break region off the coast of New Jersey.

Three‐dimensional propagation effects near the Mid‐Atlantic Bight pulse, similar to a signal employed during the experiments, will be determined. This hypothesis was investigated for the Middle Atlantic Bight (MAB) in the interdisciplinary Shelf Edge Exchange Processes (SEEP) programs I and II [Walsh et al., ; Biscaye et al., ], which concluded that only a small fraction of particulate carbon.

contributions to defining “hotspots” of uncertainty in acoustic propagation and transmission loss. The results are briefly summarized in section 6. Data and Methods Data sources The plan view climatology encompasses the entire Middle Atlantic Bight continental shelf.

Three-dimensional (3D) underwater sound field computations have been used for a few decades to understand sound propagation effects above sloped seabeds and in areas with strong 3D temperature and.

Churchill ()estimated that 18% of a km 2 area in the Middle Atlantic Bight was trawled in a six-day period of intense fishing activity and he calculated that the effective area trawled annually in 30° latitude×30° longitude areas of the Middle Atlantic Bight was up to three times their actual area.

It has long been recognized that a massive flow of Middle Atlantic Bight (MAB) shelf water is exported to the deep ocean in the region near Cape Hatteras, North Carolina. Analyses of current time series longer than days from 33 sites over the Middle Atlantic Bight continental shelf reveal a consistent mean circulation pattern.

The mean depth-averaged flow is equatorward, alongshelf, and increases with increasing water depth from 3 cm s −1 at the m isobath to 10 cm s −1 at the m isobath. The mean.

Special Issue on Effects of Sound in the Marine Environment January 2 Abstract We describe the effort to provide three-dimensional global thermohaline and sound velocity fields using a variety of Southern California Bight and the Middle Atlantic Bight. In Section 3, we examine MODAS fields.

Three-dimensional acoustics effects in the area are studied using FOR3DW, a wide-angle version of the parabolic equation code FOR3D (a Finite difference solution, an Ordinary differential equation, and Rational function approximations for solving 3D problems), and MOS3DPEF (MOdal Spectrum analysis based on 3D PE Field).

Books at Amazon. The Books homepage helps you explore Earth's Biggest Bookstore without ever leaving the comfort of your couch. Here you'll find current best sellers in books, new releases in books, deals in books, Kindle eBooks, Audible audiobooks, and. effects and mixing effects, and three-dimensional nonlinear gravity waves with hydrostatic pressure.

Note that making acoustic propagation predictions, without analysis of the behavior or the mechanisms at work, is a byproduct of coupled ocean-acoustic modeling. Coupled ocean/acoustics modeling is becoming more common. Nevertheless, the. The Middle Atlantic Bight Shelf-Slope Front The frontal boundary between colder, fresher shelf waters and warmer, saltier slope waters off the northeast coast of the United States, although partially density compensated, supports a frontal jet which exhibits vigorous submesoscale meandering and eddying variabilities.

The resulting predicted three-dimensional environment is then input to a fully three-dimensional parabolic equation acoustic code. The output from the nested ocean model, run in hindcast mode, is to be compared to field data from the Shallow Water (SW06) experiment to test and ground truth purposes.

The ECCO global ocean state estimate is described in section examples of notional tomographic observations for the North Atlantic are described in section 3, and the basic, predicted acoustic characteristics associated with those observations are described in section study makes the simplifying, but justified, assumption that a tomographic measurement.

Three-Dimensional Shallow Water Acoustics. Dr. Ying-Tsong Lin. The long-term goals of this project are targeted on understanding the 3-D acoustic effects, and example of sound propagation on a shelfbreak in the Mid-Atlantic Bight is shown in Figure 2.

One can.Atlantic Sturgeon biotelemetry acoustic detections were (Brandywine Shoal Light) in the middle of the Delaware Bay. To obtain estimates of surface water tem-perature, bottom water temperature, salinity, and current three-dimensional hydrostatic primitive equations (Shchep.The Official Magazine of The Oceanography Society.

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