نهر منعطف

For other uses, see Meander (disambiguation).

A hypothetical stream bed following a tilted valley. The maximum gradient is along the down-valley axis represented by a hypothetical straight channel. Meanders develop, which lengthen the course of the stream, decreasing the gradient.

Meanders of the Rio Cauto at Guamo Embarcadero, Cuba.

نهر منعطف أو متعرج Meander or Meandering river، هو نهر ملتو مثل الشريط، تتجمع الرواسب على الجانب الداخلي من كل منحنى، بينما يتم تعرية الرواسب من الجانب الخارجي له.

 التعرج الهندسي

Uvac canyon meander, Serbia

Concave bank and convex bank, Great Ouse Relief Channel, England.

 التكوين

Life history of a meander

Spectacular meander scars, oxbow lakes and abandoned meanders in the broad flood plain of the Rio Negro, الأرجنتين. 2010 astronaut photo from ISS.

 تضاريس اسوشيتد

 تآكل ميكانيكي

The depositional slip off slope is on the left whilst there is a small river cliff to the left. River Ashes Hollow, UK.

 ودائع

 تعرجات محززة

المقالة الرئيسية: نهر راسخ

Glen Canyon, USA

Goosenecks of the San Juan River, SE Utah. Note cut-off meander at left center.

 بحيرات اوكسبو

المقالة الرئيسية: بحيرة اوكسبو

 تعرجات مهجورة

Look up rincón in Wiktionary, the free dictionary.

 تمرير القضبان

Meanders, scroll-bars and oxbow lakes in the Songhua River

 انظر أيضا

• Riffle-pool sequence
• Helicoidal flow
• Baer's law
• Meander cutoffs in Avulsion (river)
• Meander scar
• Crevasse splay
• Jet stream exhibits meander also

 قائمة المراجع

• Hickin, Edward J. (2003). "Meandering Channels". In Middleton, Gerard V. (ed.). Encyclopedia of Sediments and Sedimentary Rocks. Kluwer Academic Encyclopedia of Earth Sciences. Dordrecht; Boston: Kluwer Academic Publishers. pp. 430–434. ISBN 1-4020-0872-4. {{cite encyclopedia}}: Invalid |ref=harv (help)
• Leopold, Luna B.; Langbein, W.B. (June 1966). "River Meanders". Scientific American: 60.
• Thonemann, P., The Maeander Valley: A historical geography from Antiquity to Byzantium (Cambridge, 2011) (Greek Culture in the Roman World Series).

 وصلات خارجية

• Movshovitz, Nitsa (2006-01-01). "River Meandering and a Mathematical Model of this Phenomenon". Physicalplus. Israel Physical Society (IPS) (7). Retrieved 2008-02-23. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)