Barchan - Wikipedia
网页A barchan or barkhan dune (from Kazakh бархан [bɑɾˈχɑn]) is a crescent -shaped dune. The term was introduced in 1881 by Russian naturalist Alexander von Middendorf, [1] based on their occurrence in Turkestan and other inland desert regions. Barchans face the wind, appearing convex and are produced by wind action predominantly from ...
Barchan | Deserts, Formation, Migration | Britannica
网页barchan, crescent-shaped sand dune produced by the action of wind predominately from one direction. One of the commonest types of dunes, it occurs in sandy deserts all over the world. Barchans are convex facing the wind, with the horns of the crescent pointing downwind and marking the lateral advancement of the sand.
Dune Types - Great Sand Dunes National Park & Preserve (U.S.
网页2024年3月5日 · Great Sand Dunes National Park contains different types of dunes, each explained below through images and animations. Each dune type is the result of different wind patterns, and the presence or lack of vegetation on the ground. NPS. Reversing Dunes. This is the predominant type of dune in the dunefield.
Barchan Lanforms - Crescentic Dune | Type of Sand Dune - World …
网页A barchan dune is also sometimes referred to as a crescentic dune, is a U-shaped type of sand dune that consists of horns or tips that point downwind or against the wind. Sand supply is abundant where barchans occur along with a …
Barchan - an overview | ScienceDirect Topics
网页Barchan dunes are crescentic dunes with a slipface and two horns that point downwind. They are associated with areas where there is a single dominant wind direction and limited sand supply. Barchans are the most simple type of …
Earth Surface Processes and Landforms - Wiley Online Library
网页2024年5月8日 · Analysis of the morphology of barchans on Mars and Earth suggest that there may exist two distinct attractor states for the asymmetry distribution. By comparing our analytical results with the observations, we show that the growth of barchan dunes appears to be dominated by processes, which are proportional to the basal area or volume of the ...
Detection and tracking of barchan dunes using artificial ... - Nature
网页2024年8月8日 · Barchans are crescent-shape dunes ubiquitous on Earth and other celestial bodies, which are organized in barchan fields where they interact with each other.
On the genesis and evolution of barchan dunes: Hydrodynamics
网页2020年8月17日 · Barchans are a type of sand dune, which have been studied for more than a century. 1–11 Barchans are mainly characterized by their crescent shape, including a windward side, two horns, and a slip face on the leeward side.
Barchan - SpringerLink
网页2015年11月20日 · Barchans are propagating crescent-shaped dunes that form under limited supply of sand, in roughly unidirectional winds (or current flow) and un-vegetated areas (Fryberger 1979; Wasson and Hyde 1983) …
Field evidence for surface-wave-induced instability of sand dunes
网页2005年9月29日 · Barchans are crescent-shaped dunes that move faster over desert surfaces than most other dune types. A three-year field study shows how they do it.
- 某些结果已被删除