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Un yardang est une crête rocheuse créée par l'érosion éolienne dans un milieu désertique. Les yardangs sont de forme allongée, au moins trois fois plus longs que larges. Vus de dessus, ils ressemblent à la coque d'un bateau ou, en forme réduite, aux pierres ponces de nos salles de bains. Le côté « au vent » est abrupt, souvent vertical. Le côté « sous le vent » est en pente douce[1]. Forme d'abrasion éolienne, ses profils sont inverses de ceux d'une barkhane, qui au contraire est une forme d'accumulation éolienne.
Le mot d'origine yardang est originaire des langues turques, il signifie « rive abrupte » et à été utilisé pour la première fois par le géographe suédois Sven Hedin (1865–1952), d'après le dictionnaire américain Webster's Third New International Dictionary (en)[2],[3], dans une langue anglo-saxonne en 1903[4]. D'après le journal chinois, Le Quotidien du peuple, il vient de la langue ouïghoure (يارداڭ, translittération : yardang) et signifie une « colline aux parois escarpées »[5].
Sur le plateau iranien, ce type d'érosion est très largement développée et est connue sous le nom persan de kalut.
On en trouve également en Chine, concentrés dans les bassins de la région autonome du Xinjiang, ainsi qu'à l'Ouest de la province du Gansu, et dans le bassin du Qaidam dans la province du Qinghai. La Chine a tenté de placer en 2015 le Géoparc national de Dunhuang Yardang au niveau du patrimoine mondial de l'UNESCO[6].
Ce sont des crêtes, qui peuvent s'allonger sur des centaines de mètres, formées par l'érosion de couches rocheuses alternativement tendres et dures. Les yardangs se rencontrent dans la plupart des déserts du monde. Suivant les vents et la composition des dépôts, ils peuvent ressembler à des formes étranges, objets, constructions, voire des personnages.
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Bill RichardsCirca 1982. Photo: Barbara McDougallBornBill Richards(1923-03-28)28 March 1923Ottawa, Ontario, CanadaDied28 February 1995(1995-02-28) (aged 71)Toronto, Ontario, CanadaOccupationsViolinistcomposerarrangereditorYears active1939–1995Spouse Billie Mae Richards (m. 1945)Children4, including Judi Richards Bill Richards (28 March 1923 – 28 February 1995) was a Canadian violinist, composer, arranger, and editor. His compositional output includes …
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Конвой SC 48Convoy SC 48 Битва за Атлантику Американський ескадрений міноносець типу «Глівз» «Карні», який узяв участь у захисті кораблів конвоюАмериканський ескадрений міноносець типу «Глівз» «Карні», який узяв участь у захисті кораблів конвою Дата: 14-18 жовтня 1941 Місце: Західн
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Radio station in Utica, New York WUSP / WRCKWUSP: Utica, New YorkWRCK: Remsen, New YorkBroadcast areaCentral New York RegionFrequencyWUSP: 1550 kHzWRCK: 1480 kHzBranding95.5 The HeatProgrammingFormatUrban Contemporary - Hip hop musicOwnershipOwnerUtica Phoenix(Phoenix Radio, Inc.)HistoryFirst air dateWUSP: 1962 (1962) (as WBVM)WRCK: 1958 (1958) (as WREM)Former call signsWUSP:WBVM (1962–1980)WUTQ (1980–2012)WRCK:WREM (1958–1966)WADR (1966–2012)Call sign meaningWUSP: Utica SPorts…
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2022 video game 2022 video gamePokémon Legends: ArceusKey art featuring the playable characters along with their PokémonDeveloper(s)Game FreakPublisher(s)JP: The Pokémon CompanyWW: NintendoDirector(s)Kazumasa IwaoProducer(s)Shigeru OhmoriAkira KinashiToyokazu NonakaTakanori SowaKenji EndoDesigner(s)Yuichi MuraseProgrammer(s)Kazuki SaitaArtist(s)Suguru NakatsuiWriter(s)Toshinobu MatsumiyaComposer(s)Go IchinoseHitomi SatoHiromitsu MaebaSeriesPokémonPlatform(s)Nintendo SwitchReleaseJanuary 28, …
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