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Related Concept Videos

Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Typical Model Studies01:30

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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Deriving the Speed of Sound in a Liquid01:09

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As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
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Echo01:06

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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Most solids and liquids are incompressible—their densities remain constant throughout. In the presence of an external force, the molecules tend to restore to their original positions, which is only possible because the constituents interact. The interactions help the constituents pass on information about external disturbances, like sound waves. Therefore, sound waves travel faster through these media. Compared to solids, the constituents in a liquid are less tightly bound. Thus, sound...
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Area of Science:

  • Oceanography
  • Acoustics
  • Numerical Modeling

Background:

  • Traditional ocean models often simplify acoustic wave behavior.
  • Accurate simulation of acoustic propagation is crucial for understanding underwater environments.

Purpose of the Study:

  • To demonstrate the capability of new non-hydrostatic, compressible ocean models in simulating acoustic waves.
  • To evaluate the impact of ocean variability on low-frequency acoustic propagation.

Main Methods:

  • Utilizing advanced numerical ocean models with adaptive spatial and temporal resolution.
  • Simulating acoustic wave and mode propagation in a free-surface, stratified, and evolving ocean.

Main Results:

  • The models accurately propagate acoustic waves and modes in a dynamic ocean.
  • Demonstrated state-of-the-art acoustic propagation modeling.
  • Illustrated the effects of ocean variability on acoustic propagation through 3D simulations.

Conclusions:

  • These models represent a significant advancement in acoustic propagation modeling.
  • Despite computational costs, they provide an unprecedented tool for deterministic analysis.
  • The models are valuable for studying the effects of ocean dynamics on underwater acoustics.