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A gully may grow in length through headward (i.e., upstream) erosion at a knick point. This erosion can result from interflow and soil piping ( internal erosion ) as well as surface runoff . Gully erosion may also advance laterally through similar methods, including mass movement, acting on the gully walls (banks), and the development of 'branches' (a type of tributary ).
Nov 21, 2023 · As implied by the gully definition, a gully is formed when a rill is left unattended or unrepaired for a long period of time, widening and deepening as soil erosion continues to take place.
It is initiation stage and this stage normally proceeds slowly. Stage 2: It is the development stage, in which due to runoff from up stream portion of the gully head, the size of gully width and depth is enlarged. Stage 3: This is the healing stage, in which vegetation starts to grow in the channel.
Jan 1, 2003 · During a rain event, many rills may develop, but only a few may grow into a gully provided that flow intensities exceed those needed for the erosion of a gully channel. For cultivated land, Nachtergaele (2001) calculated critical shear stresses during peak flow that occurred in 33 ephemeral gully channels in central Belgium and in 40 ephemeral gully channels in southern Portugal.
- Jean Poesen, Jeroen Nachtergaele, Gert Verstraeten, C Valentin
- 2003
Gully erosion is a major soil degradation problem in many parts of the world. Assessment of this process and its contributing factors are becoming increasingly important, especially in terms of climate change. Rainfall runoff is known to initiate and exacerbate gully erosion processes. In this paper, research over the past two decades focussing ...
In gully control, the following three methods must be applied according to the order given: (1) Improvement of gully catchments to reduce and regulate the run-off rates (peak flows); (2) Diversion of surface water above the gully area; (3) Stabilization of gullies by structural measures and accompanying revegetation.
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2 days ago · Gully erosion is the formation and subsequent expansion of erosional channels in the soil as a result of concentrated water flow. Gully dimensions can vary over several orders of magnitudes. Conventionally a gully is distinguished from a rill based on a critical cross-sectional area of at least one square foot, i.e. the size of a channel that can no longer be erased via normal tillage operations.
