Results 11 to 20 of about 590 (205)
On the crescentic shape of barchan dunes [PDF]
The European Physical Journal B - Condensed Matter, 2004 Aeolian sand dunes originate from wind flow and sand bed interactions. According to wind properties and sand availability, they can adopt different shapes, ranging from huge motion-less star dunes to small and mobile barchan dunes.
P. Hersen, Hersen, P.
core +4 more sources
"Barchan" dunes in the lab [PDF]
Comptes Rendus. Mécanique, 2002 3 pages, 4 figuresWe demonstrate the feasibility of studying dunes in a laboratory experiment. It is shown that an initial sand pile, under a wind flow carrying sand, flattens and gets a shape recalling barchan dunes. An evolution law is proposed for the
Dauchot, Olivier +10 more
core +6 more sources
Birth of a subaqueous barchan dune [PDF]
Physical Review E, 2020 Barchan dunes are crescentic shape dunes with horns pointing downstream. The present paper reports the formation of subaqueous barchan dunes from initially conical heaps in a rectangular channel.
Alvarez, Carlos A., Franklin, Erick M.
core +5 more sources
DETECTION OF BARCHAN DUNES IN HIGH RESOLUTION SATELLITE IMAGES [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016 Barchan dunes are the fastest moving sand dunes in the desert. We developed a process to detect barchans dunes on High resolution satellite images. It consisted of three steps, we first enhanced the image using histogram equalization and noise reduction ...
M. A. Azzaoui +4 more
doaj +2 more sources
EPJ Web of Conferences, 2017 We show that the orientation and morphology of bedforms occurring on top of Pluto’s smooth ice coats are consistent with an aeolian origin under conditions of unidirectional flow.
Parteli Eric J. R., Pöschel Thorsten
doaj +2 more sources
Corridors of barchan dunes: Stability and size selection [PDF]
Physical Review E, 2004 Barchans are crescentic dunes propagating on a solid ground. They form dune fields in the shape of elongated corridors in which the size and spacing between dunes are rather well selected. We show that even very realistic models for solitary dunes do not
Elbelrhiti, Hicham +12 more
core +6 more sources
Experimental study on the formation of subaqueous barchan dunes in closed conduits
EPJ Web of Conferences, 2018 The present paper reports the formation of subaqueous barchan dunes by analyzing the temporal evolution of their main geometrical characteristics (width W, length L and horn lengths Lh).
Alvarez Carlos A., Franklin Erick
doaj +2 more sources
A model of Barchan dunes including lateral shear stress [PDF]
The European Physical Journal E, 2005 Barchan dunes are found where sand availability is low and wind direction quite constant. The two dimensional shear stress of the wind field and the sand movement by saltation and avalanches over a barchan dune are simulated.
V. Schwämmle, H. J. Herrmann
core +4 more sources
The dune size distribution and scaling relations of barchan dunefields [PDF]
Granular Matter, 2008 Barchan dunes emerge as a collective phenomena involving the generation of thousands of them in so called barchan dune fields. By measuring the size and position of dunes in Moroccan barchan dune fields, we find that these dunes tend to distribute ...
Lind, P.G. +11 more
core +6 more sources
When Barchan Dunes Move Over Craters
Geophysical Research Letters, Volume 52, Issue 22, 28 November 2025.Abstract We investigate the possible outcomes of a subaqueous barchan moving over a crater‐like depression in the bed. For that, we carried out experiments where we varied the dune size, crater and grain diameters, and flow velocities. We found that subaqueous barchans can be blocked, destroyed, or pass over craters, with transitional situations, and ...
P. V. R. Plácido +3 more
wiley +3 more sources