Khác biệt giữa các bản “Đụn cát”

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[[FileTập tin:Morocco Africa Flickr Rosino December 2005 84514010.jpg|300px|thumb|[[Erg Chebbi]], Morocco]]
[[FileTập tin:Dunas de Maspalomas.jpg|thumb|300px|Đụn cát [[Maspalomas]] ở [[Gran Canaria]]]]
[[FileTập tin:KelsoDunesAvalancheDeposits.JPG|thumb|300px|Vết trượt lở trên đỉnh của đụn cát Kelso, khu bảo tồn quốc gia Mojave, [[California]].]]
Trong [[địa lý tự nhiên]], '''đụn cát''' (hoặc '''cồn cát''') là một [[đồi]] [[cát]] kết quả từ quá trình trầm tích gió ([[:en:aeolian processes|aeolian processes]]). Đụn cát có nhiều hình dạng và kích thước khác nhau, hình thành do tương tác giữa [[gió]] với gió. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind. The valley or trough between dunes is called a ''slack.'' A "dune field" is an area covered by extensive sand dunes. Large dune fields are known as [[erg (landform)|ergergs]]s.
 
Some coastal areas have one or more sets of dunes running parallel to the shoreline directly inland from the [[beach]]. In most cases the dunes are important in protecting the land against potential ravages by storm waves from the [[sea]]. Although the most widely distributed dunes are those associated with coastal regions, the largest complexes of dunes are found inland in dry regions and associated with ancient [[lake]] or [[sea]] beds.
The modern word "dune" came into English from French circa 1790. In ancient times, words cognate to "dune" probably had the meaning of a built-up hill or citadel fortification.<ref>[http://dictionary.reference.com/search?q=dune dune - Definitions from Dictionary.com<!-- Bot generated title -->]</ref>
 
== Tham khảo ==
{{Reflist|2}}
* [[Ralph Bagnold]] ''[[The Physics of Blown Sand]]'' (1941)
* {{Cite web | url=http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=17168 | title=Nouakchott, Mauritania | publisher=[[NASA Earth Observatory]] | accessdate=2006-04-28 }}
* V. Badescu, R. B. Cathcart and A. A. Bolonkin, "Sand Dune Fixation: a solar-powered Sahara seawater pipeline macroproject", in: ''Land Degradation & Development''; 19, (2008): doi: 10.1002/ldr.864.
* {{Cite web | url=http://pubs.usgs.gov/gip/deserts/dunes/ | title=Types of Dunes | publisher=[[USGS]] | accessdate=2010-10-06 }}
* {{Cite web | url=http://www.agc.army.mil/research/products/desert_guide/lsmsheet/lspara.htm | title=Summary: Dunes, Parabolic | publisher=Desert Processes Working Group; Knowledge Sciences, Inc. | accessdate=2010-10-06 }}
 
== Liên kết ngoài ==
* [http://www.geography-site.co.uk/pages/physical/coastal/dunes.html Coastal Sand Dunes]
* [http://www.geographyinaction.co.uk/Magilligan/Mag_intro.html Magilligan Dunes, Northern Ireland]
* [http://www.tec.army.mil/research/products/desert_guide/lpisheet/lpdunes1.htm Dune pattern identification, U.S. Army]
* [http://www.backcountryattitude.com/lnt_dune_hiking.html Treading Lightly: Minimum Impact Dune Hiking]
* [http://www.andycarvin.com/archives/2005/06/dune_racers_of.html Dune Racers of the Empty Quarter] – video of sand dunes in the United Arab Emirates
* [http://www.lbk.ars.usda.gov/wewc/biblio/bar.htm The Bibliography of Aeolian Research]
* [http://www.saharasafaris.org/sand-dunes Sahara sand dunes forms] – as investigated by native offroaders from Egypt
* [http://www.goldcoastcity.com.au/dunepolicy Gold Coast Dune Management Policy]
* [http://pubs.usgs.gov/gip/deserts/dunes/ USGS page on dune types]
* [http://alamosa.org/GreatSandDunes.aspx Great Sand Dunes National Park]
 
{{River morphology}}
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[[CategoryThể loại:Địa lý học]]
[[CategoryThể loại:Đụn cát| ]]
[[CategoryThể loại:Aeolian landforms]]
[[CategoryThể loại:Coastal and oceanic landforms]]
[[CategoryThể loại:Sedimentology]]
 
[[af:Duin]]
[[de:Düne]]
[[et:Luide]]
[[en:Dune]]
[[es:Duna]]
[[en:Dune]]
[[eo:Duno]]
[[fa:ریگ روان]]
[[fr:Dune]]
[[gl:Duna]]
[[frr:Düner]]
[[ko:사구]]
[[hi:बालुका स्तूप]]
[[it:Duna]]
[[he:חולית (דיונה)]]
[[ka:დიუნა]]
[[sw:Tuta la mchanga]]
[[ht:Din]]
[[nl:Duin]]
[[ja:砂丘]]
[[frr:Düner]]
[[no:Sanddyne]]
[[nn:Sanddyne]]
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