Colluvium


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colluvium

[kə′lü·vē·əm]
(geology)
Loose, incoherent deposits at the foot of a slope or cliff, brought there principally by gravity.

Colluvium

 

fragmental material accumulating on mountain slopes or at the foot of slopes owing to displacement from higher areas by gravity (talus, creep, and slides) or the movement of thawing, water-saturated products of weathering in areas of permafrost.

References in periodicals archive ?
Once enough water has accumulated in the colluvium, slope movement is dependent on the amount of precipitation received from the next storm (Pomeroy 1984).
We interpret the sediments as either colluvium or vertically-accreted fluvial sediments.
Field observations indicate significant colluvium storage in this region.
Note that the RUSLE model cannot be used to estimate intrabasinal sediment storage as colluvium.
Second, comparing A1D and A1U, the data confirm field observations that the pit section at the latter consisted of colluvium rather than marine sediment.
In both areas seismic motion occurred along basin-bounding faults bringing in contact Mesozoic limestone and alluvial deposits as well as colluvium.
Only 8 of the 95 soil series have underlying materials consisting of residuum, colluvium, or alluvium.
The column of loess, colluvium, and alluvium provides a medium for relatively continuous storage and flux of water that supports perennial baseflow to streams.
All soils on this catena contain only quartz in both the silt and fine sand fractions due to the parent materials of this catena being colluvium derived from sandstone for the soil on the summit, shoulder, midslope and footslope positions.
In Bollinne's (1982) original study of erosion rates in central Belgium, he uses four methods: measurement of rills on four fields over one winter; a six-year experimental study using 12 plots; measurement of the thickness of colluvium in dry valley bottoms; and measurement of colluvium in three enclosed hollows.
All Oxisols have developed on mixed colluvium and residuum (Table 1).
In small drainage basins, colluvium, channel-bank collapse, and erosion, may contribute to the sediment in transit, or depositional processes may place sediment in storage for time periods ranging from hours to millennia.