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Encyclopedia > Orography

Orography is the average height of land, measured in geopotential meters, over a certain domain. In geoscientific models, such as general circulation models, orography defines the lower boundary (except where there is ocean, of course). Because orography is spatially averaged, for example the height of the Himalaya mountains will depend on horizontal resolution. The higher the horizontal resolution, the better the orography will follow the actual terrain.


When a river's tributaries are listed in orographic sequence, they are in order from the highest (nearest the source of the river) to the lowest (nearest the mouth).


Orographic precipitation

Orographic precipitation, also known as relief precipitation, is precipitation generated by a forced upward movement of air upon encountering a physiographic upland (see anabatic wind). This upwards movement cools the air, resulting in a cloud formation and rainfall. In parts of the world subjected to relatively consistent winds (for example the trade winds), a wetter climate prevails on the windward side of a mountain than on the leeward (downwind) side as moisture is removed by orographic precipitation. Drier air (see katabatic wind) is left on the descending, generally warming, leeward side where a rain shadow is formed.


Orographic precipitation is well known on oceanic islands, such as the Hawaiian Islands, where much of the rainfall received on an island is on the windward side, and the leeward side tends to be quite dry, almost desert-like, by comparison. This phenomenon results in substantial local gradients of average rainfall, with coastal areas receiving on the order of 20 to 30 inches (500 to 750 mm) per year, and interior uplands receiving over 100 inches (2,500 mm) per year. Leeward coastal areas are especially dry—less than 20 in (500 mm) per year at Waikiki—and the tops of moderately high uplands are especially wet—about 475 in (12,000 mm) per year at Wai'ale'ale on Kaua'i.


See Also

Orographic lift


  Results from FactBites:
 
Orography at AllExperts (452 words)
Orography is the average height of land, measured in, over a certain domain.
In geoscientific models, such as general circulation models, orography defines the lower boundary (except where there is ocean, of course).
Because orography is spatially averaged, for example the height of the Himalaya mountains will depend on horizontal resolution.
Simulations paper (7795 words)
The heaviest rainfall is simulated along the important barrier of the Alps, and the sharp topographic gradient of the topography of the eastern slopes toward the Po Valley is associated with a comparable gradient in the precipitation, both observed (Fig.
For the "Algeria" and "Piedmont" cases, we consider the impact of the orography and of the flux of water vapor from the Mediterranean Sea.
Orography is very important in the simulation of the windflow at low levels over the eastern Spanish coast.
  More results at FactBites »

 
 

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