- 行业: Earth science
- Number of terms: 10770
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The UK charity dedicated to the protection of the marine environment and its wildlife.
Idealized vortex in two dimensions with zero vorticity everywhere except at a point where it is infinite. Specifically, a point vortex of strength \Gamma has vorticity \omega = \Gamma \delta( _r- _r_0)), in which \delta( _x) is the Kronecker delta and \Gamma is the circulation around the point vortex.
Industry:Earth science
Idealized vortex in which vorticity is zero everywhere except along a line in space where it is infinite. The strength of a line vortex is \Gamma, the circulation along any circuit around the line.
Industry:Earth science
Impacts on the environment, which are not a direct result of the development or industrial process, but are often produced away from it or as a result of a complex pathway. Sometimes referred to as secondary impacts. (Smothering of benthos is an example of an indirect impact).
Industry:Earth science
In a fluid with vertical density variation, the buoyancy force is the difference between the weight of an initial infinitessimal volume of fluid with the weight of a a fluid parcel of the same volume displaced to same location.
Industry:Earth science
In a stratified fluid the effective density varies with depth. Such circumstances occur naturally, for example, due to variations in temperature in the atmosphere, and due to temperature and salinity variations in the ocean.
Industry:Earth science
In meteorology, a term used loosely to distinguish radiation in the visible and near-visible portions of the electromagnetic spectrum (roughly 0. 4 to 1. 0 micron in wavelength) from long-wave (infrared) radiation.
Industry:Earth science
In meteorology, the process of formation of an occluded front . Some persons restrict the use of this time to the usual case where the process begins at the apex of a wave cyclone ; when the process begins at some distance from the apex, they call it seclusion.
Industry:Earth science
In ocean wave studies, the loss of energy from wind generated ocean waves after they have ceased to be acted on by the wind; this process is accompanied by an increase in length and a decrease in height of the wave.
Industry:Earth science
In oceanography, a current associated with horizontal pressure gradients in the ocean and determined by the condition that the pressure force due to the distribution of mass balances the coriolis force due to the earth's rotation. The gradient current corresponds to the geostrophic wind in meteorology. In practice, the distribution of density is determined by measurements of salinity and temperature at a series of depths in a number of positions. From this the geopotential topography of any isobaric surface relative to any other isobaric surface may be computed and the horizontal pressure gradient may be expressed by the geopotential slope of the isobaric surface. In this way = relative gradient currents are obtained, corresponding to thermal wind in meteorology. If one isobaric surface is known to be level, the absolute geopotential topography of any other surface may be computed by reference to this, and hence absolute gradient currents are obtained. Where no isobaric surface is level, the total gradient current will consist of the relative gradient current , due to the distribution of density, and the slope current , due to that portion of the inclination of the isobaric surfaces which is not the result of the distribution of density.
Industry:Earth science
In oceanography, a water current flowing beneath a surface current at a different speed or in a different direction.
Industry:Earth science
