alluvial fan -- n. A fan-shaped deposit of sand, mud, etc. formed by a stream where its velocity has slowed, such as at the mouth of a ravine or at the foot of a mountain.
alluvial fan Land counterpart of a delta . An assemblage of sediments marking place where a stream moves from a steep gradient to a flatter gradient and suddenly loses transporting power.
Alluvial Fan
Large fan shaped terrestrial deposit of alluvial sediment on which a braided stream flows over. Form as stream load is deposited because of a reduction in the velocity of stream flow.
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AO An alluvial fan inundated by 100-year flooding (usually sheet flow on sloping terrain), for which average flood depths and velocities have been determined; flood depths range from 1 to 3 feet.
A large alluvial fan, in blue, appears near the upper left; at its eastern (right) margin is a conspicuous area of red-rendered vegetation which marks a zone where subsurface and surface waters from snow melt in the Andes passes onto the high plains.
Alluvial Fan:
A fan-shaped wedge of sediment that typically accumulates on land where a stream emerges from a steep canyon onto a flat area. In map view it has the shape of an open fan. Typically forms in arid or semiarid climates.
Some dynamic models with local interactions (e.g. river meandering or the modelling of alluvial fans and deltas) need a stochastic seed to get them started and Gstat provides ways of creating these randomised inputs.
 See also: Area, Surface, Plain, Region, Basin
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