Gully

Gully

:"This article refers to the landform. For other uses, see Gully (disambiguation)."

A gully is a landform created by running water eroding sharply into soil, typically on a hillside. Gullies resemble large ditches or small valleys, but are metres to tens of metres in depth and width. When the gully formation is in process, the water flow rate can be substantial, which causes the significant deep cutting action into soil.

Gullying, or gully erosion, is the process by which gullies are formed. Hillsides are more prone to gullying when they are cleared of vegetation, through deforestation, over-grazing or other means. The eroded soil is easily carried by the flowing water after being dislodged from the ground, normally when rainfall falls during short, intense storms such as during thunderstorms. Gullies reduce the productivity of farmland where they incise into the land, and produce sediment that may clog downstream waterbodies. Because of this, much effort is invested into the study of gullies within the scope of geomorphology, in the prevention of gully erosion, and in restoration of gullied landscapes. The total soil loss from gully formation and subsequent downstream river sedimentation can be sizable.

Hydraulic mining

Artificial gullies are formed during hydraulic mining when jets or steams of water are projected onto soft alluvial deposits to extract gold or tin ore. The remains of such mining methods are very visible landform features in old goldfields such as in California and northern Spain. The badlands at Las Medulas for example, were created during the Roman period by hushing or hydraulic mining of the gold-rich alluvium with water supplied by numerous aqueducts tapping nearby rivers. Each aqueduct produced large gullies below by erosion of the soft deposits. The effluvium was carefully washed with smaller streams of water to extract the nuggets and gold dust.

Etymology

The earliest usage of the term is from 1657. It originates from the French word "goulet", a diminutive form of "goule" which means "throat". It is possible that the term was derived from a type of knife at the time, a "gully-knife", because hills that have gullies look as if they are cut open with a sharp knife.

ee also

* Arroyo (creek)
* Canyon
* Gulch
* Ravine
* Wadi
* Lavaka
* Badlands

References

* "Oxford English Dictionary"


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  • Gully — ist die Bezeichnung für: eine größere, durch fließendes Wasser geformte Erosionsrinne einen Regenwassereinlauf im Straßenbau, der Straßenablauf eine Abflussöffnung im Boden von Nassräumen eine Verschluckstelle eines Gewässers im Gelände, siehe… …   Deutsch Wikipedia

  • Gully — Gul ly, n.; pl. {Gullies}. [Formerly gullet.] 1. A channel or hollow worn in the earth by a current of water; a short deep portion of a torrent s bed when dry. [1913 Webster] 2. A grooved iron rail or tram plate. [Eng.] [1913 Webster] {Gully gut} …   The Collaborative International Dictionary of English

  • Gully — Sm Abfluß erw. fach. (19. Jh.) Entlehnung. Entlehnt aus ne. gully, wohl einer Nebenform von ne. gullet Schlund , dieses aus afrz. goulet, einem Diminutivum zu afrz. gole, goule Kehle , aus l. gula f.    Ebenso ne. gully; Kehle1. englisch e …   Etymologisches Wörterbuch der deutschen sprache

  • Gully — Gully, MN U.S. city in Minnesota Population (2000): 106 Housing Units (2000): 66 Land area (2000): 2.010076 sq. miles (5.206072 sq. km) Water area (2000): 0.008879 sq. miles (0.022996 sq. km) Total area (2000): 2.018955 sq. miles (5.229068 sq.… …   StarDict's U.S. Gazetteer Places

  • Gully, MN — U.S. city in Minnesota Population (2000): 106 Housing Units (2000): 66 Land area (2000): 2.010076 sq. miles (5.206072 sq. km) Water area (2000): 0.008879 sq. miles (0.022996 sq. km) Total area (2000): 2.018955 sq. miles (5.229068 sq. km) FIPS… …   StarDict's U.S. Gazetteer Places

  • Gully — Gul ly, v. t. [imp. & p. p. {Gullied}; p. pr. & vb. n. {Gullying}.] To wear into a gully or into gullies. [1913 Webster] …   The Collaborative International Dictionary of English

  • gully — channel made by running water, 1650s, possibly a variant of M.E. golet water channel (see GULLET (Cf. gullet)). Gully washer, Amer.Eng. colloquial for heavy rainstorm, attested by 1887 …   Etymology dictionary

  • Gully — Gully: Die Bezeichnung für »Schlammfang, Senkloch« ist ein junges Lehnwort aus gleichbed. engl. gully, das wohl zu gullet »Schlund« gehört. Voraus liegen afrz. goulet (Verkleinerungsbildung zu gole, goule; entspr. frz. gueule »Kehle«), lat. gula… …   Das Herkunftswörterbuch

  • gully — gully1 [gul′ē] n. pl. gullies [altered < ME golet, water channel, orig., GULLET] a channel or hollow worn by running water; small, narrow ravine vt. gullied, gullying to make a gully or gullies in gully2 [gul′ē, gool′ē] n. pl. gullies …   English World dictionary

  • Gully — Gul ly, v. i. To flow noisily. [Obs.] Johnson. [1913 Webster] …   The Collaborative International Dictionary of English

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