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colluvial

colluvial

9.9
Soil or rock that moves down a slope by gravity and stays at the bottom
  • adjective
  • /kəˈluːviəl/
  • Specialized
: coluvial
  • At the base of the hill, colluvial soil accumulates due to the force of gravity.
  • colluvial deposits

Examples

  • Rockfalls are just one of many examples of gravity-driven colluvial transport in areas with relief.

    Academic text (2001)
  • Soil depths range from 5 to 30 centimeters but are deepest at colluvial sites and in valley bottoms, which are filled with sediment up to 2 meters thick.

    Academic text (2002)
  • Colluvial movement of hillslope materials or snow involves mostly solid matter but may include substantial amounts of water.

    Academic text (2001)
  • There, the Late Classic Maya used alluvial and colluvial fills and organic fertilizers with the nearby seasonal water supply as part of their subsistence system.

    Academic text (2002)
  • It is generally believed that depositional basins at or near their moisture saturation points may promote C stabilization more than aerated colluvial deposits.

    Academic text (2007)
  • Erosion creates significant, formerly uncounted C sinks; thus, there is a major need to better understand the C-sink potential of erosion in buried soils and the processes that slow the turnover of buried C in alluvial and colluvial soils in different regions.

    Academic text (2007)
  • The gardener discovered that the plants thrived in the rich, colluvial deposits at the foot of the hill.

  • To understand how soil has been shaped by gravity over time, geologists study colluvial layers.

Surface Forms

colluvial positive

Morphology

colluvial = colluvium (opaque) = colluvi + al

The adjective is a regular -al formation from the technical noun 'colluvium', but the base is specialized and unlikely to be recognized by average learners.

Etymology

Colluvial comes from Latin parts col- 'together' and luere 'to wash', giving the image of material being washed or pushed together. So colluvial describes soil and rock that have moved down a slope and collected at the bottom.