Denudation


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denudation

[‚dē·nü′dā·shən]
(geology)
General wearing away of the land; laying bare of subjacent lands.

Denudation

 

the sum total of the processes of ablation and transportation (by water, wind, ice, or the direct action of the force of gravity) of disintegrated rock into subsided areas of the earth’s surface, where these products accumulate.

Tectonic movements have a great effect upon the rate and character of denudation. The direction of topographic development depends on the relationship between denudation and the movements of the earth’s crust. When the processes of disintegration and denudation predominate over the effect of a structural high, there is a gradual lowering of the absolute and relative elevations and a general leveling of the relief. As a result of the protracted predominance of denudation processes, entire highlands can be turned into rolling denuded plains (peneplains). Other denuded surfaces, such as pediments, pediplains, and piedmont steps are also the consequence of denudation. To a certain extent the intensity of denudation can be judged from the amount of drift carried away by rivers (up to several thousand tons a year). The term “denudation” is also sometimes used in a narrower sense to signify the processes of ablation (removal) of the products of erosion solely by planar washout.

References in periodicals archive ?
Rozwoj denudacji antropogenicznej w srodkowej czesci Polski polnocnej [The Development of Anthropogenic Denudation in Central Part of Northen Poland].
Loss of glands and mucosal denudation (gastrointestinal biopsies from high-risk transplant-associated thrombotic microangiopathy patients).
Ferrer, "Reduced contractile function after balloon denudation of rat carotid arteries," European Journal of Pharmacology, vol.
A steady-state may be temporarily achieved for soil thickness, however not because the rate of soil thickening continues to decrease until it reaches zero, but because the soil thickening rate may decrease to a value equalling the denudation rate in a landscape.
The degree of denudation of an ore deposit is an important factor in determining the preservation potential of orebodies and hence the prospectivity of an area.
The original reservoirs underwent both thermal cracking during a long time and uplift and denudation at later times, and were mostly destroyed and transformed into paleo-reservoirs.
During the years of abundant melt water runoff the solvent activity and surface and underground chemical denudation associated with liquid drain by especially close relationship increased.
Den Dunnen et al., "Neuroependymal denudation is in progress in full-term human foetal spina bifida aperta," Brain Pathology, vol.
Physical denudation of the ECs bed has been described at atheroma plaque locations and a failure to locally regenerate the endothelium is suspected to be deleterious to the endothelium function [16].
The result was extensive denudation of forests with rampant illegal logging.
Mechanical and chemical injury of the pylorus leads to denudation of the mucosa and results in the development of synechiae and subsequent fibrous cicatrisation.4 According to Tandler in 1900, this anomaly Section of Pediatric Surgery, Department of Surgery, The Aga Khan University Hospital, Karachi.
Coupled with this is the denudation of the forest cover that results in the reduction of oxygen in the atmosphere.