Barchan vs Crescentic - What's the difference?
barchan | crescentic |
An arc-shaped sand ridge comprised of well-sorted sand.
* 1966 , Edwin Sherbon Hills, Arid Lands: A Geographical Appraisal ,
*1988 , (Robert Irwin), The Mysteries of Algiers , Dedalus 1993, p. 69:
*:But to follow the dunes around the foot of their slopes is also tedious and one can walk for half a kilometre east or west, finding one barchan linked to another and no easy way through […].
* 2008 , Julie Laity, Deserts and Desert Environments ,
* 2010 , Robert S. Anderson, Suzanne P. Anderson, Geomorphology: The Mechanics and Chemistry of Landscapes ,
growing, increasing, gaining size etc.
Crescent-shaped.
* 1972 , Vladimir Nabokov, Transparent Things , McGraw-Hill 1972, p. 25:
As a noun barchan
is an arc-shaped sand ridge comprised of well-sorted sand.As an adjective crescentic is
growing, increasing, gaining size etc.barchan
English
(wikipedia barchan)Alternative forms
* barkhanNoun
(en noun)page 72,
- The sand is usually very well sorted in barchans', for it is constantly re-worked as the dune ‘marches’. The marching also causes cross-bedding inside the ' barchan , with a dip parallel to the sand-fall face.
page 205,
- Barchans and transverse dunes are essentially of the same type, forming and migrating under a unidirectional wind regime. The difference between the two is related to the amount of sand: barchans are isolated mounds, whereas transverse dunes are composed of many barchans coalesced into a single, longer dune form (Tsoar 2001).
page 482,
- Perhaps the most distinctive is the barchan' dune, an isolated crescentic form with arms that stretch downwind. ' Barchans are not huge, often with heights of only a few meters.
crescentic
English
Adjective
(en adjective)- Twin dimples of the crescentic type came down her tanned cheeks on the sides of her mournful mouth.