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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

aggradation

The addition of a material to the earth’s surface to promote the uniformity of a grade or slope.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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BP (Morlan, 1980), prevailing cold temperatures allowed permafrost to aggrade through the glaciolacustrine sediments and form segregated ice lenses.
These streams deposit the excess sediment in their channels, floodplains or banks, which thereby aggrade over time.
Active layers between 60 and 100 cm develop over permafrost that aggrades upward with sedimentation and vegetation succession (Morse et al., 2009).
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