Power spectrum

Power spectrum

The Fourier transform of the kinetic energy field. The power spectrum provides a useful diagnostic to measure a what length scales energy is concentrated and, in turbulent flow, over what length scales energy is transferred and dissipated.

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Industry/Domain: Earth science
Category: Oceanography
Company: Marine Conservation Society
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power spectrum

Earth science; Physical oceanography

The presentation of the square of the amplitudes of the harmonics of a time series as a function of the frequency of the harmonics.

power spectrum

Earth science; Oceanography

The Fourier transform of the kinetic energy field. The power spectrum provides a useful diagnostic to measure a what length scales energy is concentrated and, in turbulent flow, ...

power spectrum

Science; Acoustics

The average squared magnitude of multiple frequency spectra.

coherent output power spectrum

Science; Acoustics

A measure of what part of the (output) power spectrum is fully coherent with the input signal.

cross power spectrum

Science; Acoustics

Measurement of two signals with an amplitude that is the product of the two signal amplitudes and a phase that is the difference of the two phases.

power spectrum averaging

Science; Acoustics

Also called RMS averaging, calculates the weighted average of the sum of the squared levels. The weighting is either linear or exponential. RMS averaging reduces random ...

placer

Earth science; Oceanography

A layer of minerals laid down by flowing water. People who pan for gold search through placers.

reef

Earth science; Oceanography

An underwater ridge of rock that rises up to or near the surface. Reefs are important ecosystems that provide home for sea life.

aquascape

Earth science; Oceanography

A scenic view of a body of water; an area having a natural or constructed aquatic feature (as a pond or fountain).

equatorial rossby wave

Earth science; Oceanography

An equatorially trapped westward propagating wave that moves due to isentropic gradients of potential vorticity. The meridional velocity of the n'th mode of these waves has the ...

blackbody radiator

Earth science; Oceanography

A hypothetical, ideal radiator that totally absorbs and reemits all energy incident upon it. Actual objects only approach this ideal.

shear instability

Earth science; Oceanography

An instability of an unbounded parallel shear flow to the growth and nonlinear development of waves with phase speed in the along flow direction approximately equal to the speed ...

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