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2 edition of Resonator measurements of acoustic characteristics of some marine crustaceans found in the catalog.

Resonator measurements of acoustic characteristics of some marine crustaceans

Fred J. Mallgrave

Resonator measurements of acoustic characteristics of some marine crustaceans

a laboratory experiment

by Fred J. Mallgrave

  • 28 Want to read
  • 11 Currently reading

Published .
Written in

    Subjects:
  • Echo scattering layers.

  • Edition Notes

    Statementby Fred J. Mallgrave III.
    The Physical Object
    Pagination45 leaves :
    Number of Pages45
    ID Numbers
    Open LibraryOL14277784M

      () -- Over the past decade, researchers have developed a variety of reliable real-time and archival instruments to study sounds made or . Consider the acoustic field in an oscillating resonator of length I driven by an external force. The resonator is axisymmetric with the inner radius given by r=r(x), O.

    This value is on par with the pressure level generated by some whales and is not expected to harm marine life (Parvin et al. ). The second technology, customer-design microchip technology, allows for the development of electronic chips designed to provide specific functionality, in our case an acoustic receiver and datalogger that can Cited by: 2. Determine if a Sound Affects a Marine Animal Tutorial Introduction. This tutorial is designed for a decision maker to get the basics of how you can determine if a sound affects a marine animal. The user can proceed from one topic to the next in sequence or jump to a topics of special interest.

    This paper presents an acoustic archival tag capable of tracking small marine animals. It is also a technology that can be ported to other platforms, such as the Cited by: 2. areas, between about 50 to m deep, constitute acoustic ducts under all circumstances. For a sound source and a receiver both within an acoustic duct, numerous transmission paths exist. It is the acoustic interference between these paths which causes much of the observed spatial and spectral variability.


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Resonator measurements of acoustic characteristics of some marine crustaceans by Fred J. Mallgrave Download PDF EPUB FB2

Resonator measurements of acoustic characteristics of some marine crustaceans: a laboratory experiment / (Monterey, Calif.: Naval Postgraduate School, ). A heavy walled steel tube has been used as an impedance tube for measuring the acoustic impedance of marine sediments. The acoustic characteristics of the water filled tube were found to be satisfactory for the measurements.

Values of acoustic velocity and attenuation in the sediments were determined from the acoustic impedance measurements and Cited by: 1. The acoustic echo levels from zooplankton are strongly dependent upon the acoustic frequency and size, shape, orientation, and material properties of the animals.

Because of the great number of species of zooplankton, it is practical to study the acoustic properties of species grouped by their gross anatomical by:   Features of underwater sound scattering by small crustaceans are considered. The scattering data are obtained with the use of unique instrumentation that allows one to measure quantitative scattering characteristics (backscattering cross sections and angular scattering patterns) for crustaceans of different sizes, at different frequencies (20– kHz) and different insonification by: 2.

Sonars and echosounders are widely used for remote sensing of life in the marine environment. There is an ongoing need to make the acoustic identification of marine species more correct and. Acoustic characteristics of forage fish species in the Gulf of Alaska and Bering Sea based on Kirchhoff-approximation models Stéphane Gauthier and John K.

Horne Abstract: Acoustic surveys are routinely used to assess fish abundance. To ensure accurate population estimates, the characteristics of echoes from constituent species must be by: Ambient Noise and Marine Mammal Acoustics the data not readily apparent. Transient signals, such as marine mammal phonations, are often buried in the background ambient noise.

The following illustra-tions are examples of some of the results of the spectral analysis from one of the Gulf of Mexico experiments conducted by LADC.

Unit 2. Lesson 1. Introduction to Marine Mammals and Acoustics Lesson Objectives: • Introduce basic acoustic principles and the movement of sound through air and water.

• Students will gain an understanding of the importance of the study of acoustic oceanography. • Students will gain an understanding of why and how marine mammals use sound. Some aquatic decapod crustaceans produce sounds, and many are able to detect substrate vibration at sensitivities sufficient to tell of the proximity of mates, competitors, or predators.

Marine crustaceans have been shown to produce, detect and respond to sound (Staaterman et al.,Radford et al.,Hughes et al., ). Understanding in relation to the sensitivity of commercial UK crustacean species throughout their life history, including long term chronic exposure is especially warranted owing to the high value of Cited by: Data were scrutinized on a daily basis by a team of experts within 24 h of data collection (Fig.

1(A)).The result of the scrutiny was nautical area scattering coefficient values (s A, m 2 nmi − 2, MacLennan et al., ) allocated to categories and stored in a relational database.s A is a measure of the backscattering intensity per unit surface area over some depth by: Página 3 de 7 where Zm0 is the slit impedance; Zma is the slit impedance of the added air body outside the slit; Zmi is the slit impedance of the added air body inside the slit; and Zv is the impedance of the resonator’s body.

The slit impedance Zm has the following final expression: v r r r m Z S u t u Z j t S u t u Z + ω ρ + π η ω+ + ωρ + ∆ + ρ η ρ + π = 0 0 0File Size: KB. These areas include: 1. Physics of Sound in Marine Sediments, 2. Physical and Engineering Properties of Deep-Sea Sediments, 3. The Role of Bottom Currents in Sea Floor Geological Processes, 4.

Nephelometry and the Optical Properties of the Ocean I'laters, S. Natural Gases in Marine Sediments and Their Mode of by:   Small boats are often a dominant noise source in harbors, coastal regions, and lakes.

However, detailed information about acoustic characteristics is not generally available. To remedy this deficiency, measurements of underwater acoustic signatures from various small boats have been conducted under controlled conditions. Boats used in the measurements were powered by a variety of Cited by: 9.

a High-frequency Acoustic Recording Package (HARP) capable of sample rates up to kHz. Currently, HARPs accumulate data at a rate of almost 2 TB per instrument deployment which creates challenges for processing these large data sets.

One method we employ to address some of these challenges is a spectral averaging algorithm in which. acoustic richness, temporal and frequency entropies, and the acoustic complexity index (ACI).

While the majority of research has focused on terrestrial environments (e.g. Pieretti et al.,Sueur et al.,Towsey et al., ), some of these have been examined.

Sharks and some other fish species are able to sense and react to low-frequency sound (Myrberg et al., ; Myrberg, ). Therefore, it is possible that human-generated low-frequency sound can interfere with the normal behavior of some marine animals and there is some evidence that this occurs (Myrberg, ; Richardson et al.

marine animals (Leaper et al.Van Parijs et al.Barlow & Taylor ) and the characteristics of their calls (Møhl et al.Au & WursigMad-sen et al. Solitary, low-frequency-vocalizing ani-mals can be tracked at long ranges using arrays. As sound passes through sea-water some of the acoustic energy is absorbed, and the higher the frequency, the more sound energy is lost through absorption.

A Hz sound would have to travel more t km before half of the sound energy was absorbed, whereas a kHz sound would only have to travel about m before the same halving of Cited by: Measure marine mammal’s reaction to sound How do you measure a marine mammal’s reaction to sound.

Although the effects of noise on people have been studied extensively, only recently has a substantial amount of effort been devoted to studying the effects of sound on animals, particularly marine mammals.

A variety of methods are being applied or developed to help measure the effect of. ACOUSTIC SEDIMENT CHARACTERIZER Compact – In-situ – Multi-purpose Description INSEA is an innovative in-situ measurement system for sediment characterization using acoustics.

It provides an accurate in-situ information on the acoustic characteristics of the first layer of .Comparison of Acoustic Measurements of Zooplankton Populations Using an Acoustic Water Column Profiler and an ADCP their characteristics are usually specified sufficiently well to allow useful estimates of the volume backscatter strength to be made.

The choice of to allow some adjustment of the limited dynamic range of the 8-bit A/D.Background Information on Marine Mammals and Ocean Noise 1 Sonar, Seismics and Marine Mammals: Timeline Passage of Marine Mammals Protection Act established a moratorium on "taking" of marine mammals, where "take" is defined as "to harass, hunt capture or kill, or attempt to harass, hunt, capture or kill any marine mammal." mid's.