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DIFFLUENCE - 2 reference results
Deformation (meteorology)

Deformation is the rate of change of shape of fluid bodies. Meteorologically, this quantity is very important in the formation of atmospheric fronts, in the explanation of cloud shapes, and in the diffusion of materials and properties.

Equations

The deformation of horizontal wind is defined as def mathbf{V} = sqrt{A^2 + B^2}, where A = frac{partial v}{partial x} + frac{partial u}{partial y} and B = frac{partial u}{partial x} - frac{partial v}{partial y}, representing the derivatives of wind component. Because these derivatives vary greatly with the rotation of the coordinate system, so do A and B.

Stretching direction

The deformation elements A and B (above) can be used to find the direction of the dilatation axis, the line along which the material elements stretch (also known as the stretching direction). Several flow patterns are characteristic of large deformation: confluence, diffluence, and shear flow. Confluence, also known as stretching, is the elongating of a fluid body along the flow (streamline convergence), while diffluence, also known as shearing, elongating of a fluid body normal to the flow (streamline divergence).

See also

References

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This article is licensed under the GNU Free Documentation License.
Last updated on Monday February 04, 2008 at 22:37:01 PST (GMT -0800)
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glacial diffluence
Jan 01, 2004; glacial diffluence See glacial breach .
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diffluence
Jan 01, 2001; diffluence An increase in the separation of the streamlines in a flow such as an airstream. It is the opposite of confluence and...
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Upper-level frontogenesis associated with the birth of mobile troughs in northwesterly flow
Nov 01, 2002; ABSTRACT Previous studies have shown that 500-hPa mobile trough births (or genesis) occur preferentially in northwesterly flow...
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confluence
Jan 01, 2001; confluence A reduction in the separation of adjacent streamlines in the flow of any fluid such as air or water. It is the...
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glacial breach
Jan 01, 2004; glacial breach A glacially eroded trough that cuts through a ridge and so breaches a former divide . It is formed when the...
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