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The geographic cycle, or cycle of erosion, is an idealized model that explains the development of relief in landscapes. [1] The model starts with the erosion that follows uplift of land above a base level and ends, if conditions allow, in the formation of a peneplain . [ 1 ]
While King's ideas were an attempt at refuting Davis' cycle of erosion they were themselves of cyclical nature and contributed to what Cliff Ollier has called "Davis bashing" — the ridicule of cyclical theories in geomorphology, in particular Davis' ones. Critics did however not propose alternative models. [1]
A region can be uplifted at any stage. This lowers the base level and streams begin active downward erosion again. Dynamic rejuvenation may be caused by the epeirogenic uplift of a land mass. Warping or faulting of a drainage basin will steepen the stream gradient followed by the downcutting. The effect of seaward tilting can be felt ...
In the cycle of erosion model, knickpoints advance one cycle upstream, or inland, replacing an older cycle. [1] A knickpoint that occurs at the head (furthest upstream extent) of a channel is called a headcut. [2] Headcuts resulting in headward erosion are hallmarks of unstable expanding drainage features such as actively eroding gullies. [3]
An early popular geomorphic model was the geographical cycle or cycle of erosion model of broad-scale landscape evolution developed by William Morris Davis between 1884 and 1899. [11] It was an elaboration of the uniformitarianism theory that had first been proposed by James Hutton (1726–1797). [24]
W.M. Davis, the man who proposed the peneplanation cycle. As denudation came into the wider conscience, questions of how denudation occurs and what the result is began arising. Hutton and Playfair suggested over a period of time, a landscape would eventually be worn down to erosional planes at or near sea level, which gave the theory the name ...
Denudation chronology revolves around episodes of landscape-wide erosion, better known as denudation. The cycle of erosion model is a common approach used to establish denudation chronologies. [ 1 ]
Few soil erosion models consider gully erosion, mostly due to difficulties in modelling these large erosional features. Several studies have evaluated the ability of soil erosion models to realistically predict measured rates of erosion, mainly on agricultural landscapes. There is often a wide discrepancy between predicted and observed erosion ...
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