Gullies : Severe Erosion happens due to water action. Slope more than 5 per cent areas. Soil loss also > 10t/ha/annum
Ravines: Extreme erosion due to water. Due to riverlet/stream areas it will appear. Slope also > 5 percent....
Ravines and gullies are erosional features that exist on a continuum of scales. A ravine is defined as a small, narrow, and deep depression, smaller than a valley, and larger than a gully (Bates and Jackson, 1984). Both grow by head cutting. Ravines are usually longer and deeper than gullies. Gullies may be small enough to plow, these are ephemeral gullies. Ravines are too large to traverse with vehicles. Gullies can often be identified by high Stream Power Index signature values (>7). Ravines can often be identified using a combination of terrain attributes, including slope, profile curvature and flow accumulation.
Gully and ravines are two extreme form of soil erosion. Gullies are usually formed when many rills join together and further extended with more than 30 cm depth. Gully formation depends on the runoff producing characteristics of the watershed; the drainage area; soil characteristics; the alignment and the gradient of the channel. Based on the size, gully can be classified as small gully with < 1m depth; medium gully with 1-5 m depth and large gully with >5 m depth. whereas, ravines are most extreme form of erosion with intricate net work of various forms of gullies. usually in ravine lands, the drainage density is very high and has multi-directional slopes. These areas cannot be eliminated by tillage or ploughing because of their depth and slopes. Three different strategies have been suggested by Central Soil and Water Conservation Research & Taining Institute, Dehradun to control gully head, gully slope and gully beds. You can visit to the website of the institute for further details.
Hi, is there any reference to classified gullies based on channel width?
Thanks in advance!
Napoleon
According to the different answers, I guess that the evolution of ravines in an extense area creates a badland landscape. Then at the begining, in a land degradadtion process, first gullies grow. After that gullies evolve to ravines, and finally to a badland. ¿Am I wrong? I know how is the process in Spanish language (cárcavas (gullies), barrancos (ravines), y malpaís o malas tierras (badlands)), but it is not so clear to me in English language.
The term 'Ravine' is simply the French synonym of the English word 'Gully'. Many opine that ravines are larger gullies or network of gullies, but these are certainly not strictly defined in available literature. I have personally seen usage of the term 'Ravine' to refer to gorges or canyons. 'Gully' is the standard term when one wants to refer to channelised soil erosion features larger than rills, just like 'Badlands' is the most popular term to denote an area characterised by an intricate network of gullies (among other features). Period.
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