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Dune collisions [5] [6] and changes in wind direction spawn new barchans from the horns of the old ones and govern the size distribution of a given field. [7] As barchan dunes migrate, smaller dunes outpace larger dunes, catching-up the rear of the larger dune and eventually appear to punch through the large dune to appear on the other side.
Isolated barchan dunes on the surface of Mars. Dominant wind direction would be from left to right. Barchan dunes are crescent-shaped mounds which are generally wider than they are long. The lee-side slipfaces are on the concave sides of the dunes. These dunes form under winds that blow consistently from one direction (unimodal winds). [25]
Transverse dunes, also called barchan, form when there is a unidirectional (unimodal) wind regime. [8] A third type of dune, the star dune, is typically formed in multidirectional (multimodal) wind regimes. [8] The presence of each of these dune forms, suggests the wind regime that produced it. [9] Linear and star dunes are rare on Mars. [9]
Barchan: A type of dune that forms as a result of low sediment supply in regions where wind blows in one primary direction. This causes the dune to have a concave shape, with the tails facing downwind. [8] Transverse dunes and Seif dunes are some alternative examples of the effect of unidirectional air flow on dune formation. Barchan dune ...
Olympia Undae contains a variety of dune forms and wind-related depositional features, including sand sheets, [11] transverse dunes, simple barchan dunes, mega-barchans, and complex barchanoid ridges. [12] All of these dune types occur on Earth too. Barchans are isolated, crescent-shaped dunes with horns that point downwind. They occur is areas ...
Diagram showing barchan dune formation, with the wind blowing from the left. Sand dunes are accumulations of windblown sand piled up in mounds or ridges. They form downwind of copious sources of dry, loose sand and occur when topographic and climatic conditions cause airborne particles to settle.
Barchan, and Seif dunes are among the most common of desert dunes. Barchan dunes are formed as winds continuously blow in the same direction, and are characterized by a crescent-shape atop the dune. Seif dunes are long and narrow, featuring a sharp crest, and are more common in the Sahara Desert. [8]
Barchan – Crescent-shaped dune; Barrier bar – Natural submerged sandbank that rises from a body of water to near the surface; Barrier island – Coastal dune landform that forms by wave and tidal action parallel to the mainland coast; Bay – Recessed, coastal body of water connected to an ocean or lake