aggradation

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aggradation

[‚ag·rə′dā·shən]
(geology)
(hydrology)
A process of shifting equilibrium of stream deposition, with upbuilding approximately at grade.

aggradation

The addition of a material to the earth’s surface to promote the uniformity of a grade or slope.
References in periodicals archive ?
BP (Morlan, 1980), prevailing cold temperatures allowed permafrost to aggrade through the glaciolacustrine sediments and form segregated ice lenses.
Active layers between 60 and 100 cm develop over permafrost that aggrades upward with sedimentation and vegetation succession (Morse et al.
Aggrades = Average grades Employed = Number of hours employed each week TV Watch = Hours spent watching TV/VCR each week Hrs Study = Hours spent per week studying at home Mag Read = Newspaper/Magazines Read (1) Otherwise (0) Liv Part = Living with mother and father (1) Otherwise (0) Par School = Highest education of parent/guardian Sex = Male or female; Male (1), Female (0) White = Race; White (1), Black (0) Housing = Rent or own a house; Own House (1), Otherwise (0)
In deeper lakes (> 2 m), a thaw bulb may develop in the underlying permafrost, but upon drainage, permafrost aggrades into the sediments, and the ice-wedge network is reestablished.
Second, as peat accumulates, permafrost aggrades from below, drawing water to the plane of freezing (Zoltai and