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Barchan-Barchan Dune Repulsion Investigated at the Grain Scale
Journal of Geophysical Research F: Earth SurfaceAbstract Barchans are eolian dunes of crescent shape found on Earth, Mars and other celestial bodies. Among the different types of barchan‐barchan interaction, there is one, known as chasing, in which the dunes remain close but without touching each other.
Nicolao C Lima +2 more
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Bidirectional Winds, Barchan Dune Asymmetry and Formation of Seif Dunes From Barchans: A Discussion
Environmental Earth Sciences, 2016Barchan dunes—which have a crescent shape with two horns pointing downwind—may undergo a transition to a longitudinal (seif) dune under a bimodal wind regime. Understanding the barchan–seif dune transition is important for the research of dune field evolution and for the investigation of planetary climate and wind regimes. Two models have been proposed
Haim Tsoar, Eric J. Parteli
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Journal of Arid Environments, 1993
Abstract Sand dunes represent the most significant landform on the surface of Qatar Peninsula. In this study: field survey and laboratory work were undertaken; topographic maps, aerial photographs and satellite images were interpreted, to describe Qatar dunes both qualitatively and quantitatively.
N.S. Embabi, M.M. Ashour
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Abstract Sand dunes represent the most significant landform on the surface of Qatar Peninsula. In this study: field survey and laboratory work were undertaken; topographic maps, aerial photographs and satellite images were interpreted, to describe Qatar dunes both qualitatively and quantitatively.
N.S. Embabi, M.M. Ashour
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The Shape of the Barchan Dunes of Southern Morocco
Geomorphology, 2000We present detailed shape measurements of several barchan dunes in southern Morocco, near Laâyoune. Using these data, we disprove the concept of shape invariance of barchan dunes of different sizes. Nevertheless, some parts of the barchan dune scale and we try to distinguish these from non-scaling ones.
H J Herrmann, P Rognon
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Relevant Length Scale of Barchan Dunes
Physical Review Letters, 2002A new experiment can create small scale barchan dunes under water: some sand is put on a tray moving periodically and asymmetrically in a water tank, and barchans rapidly form. We measure basic morphological and dynamical properties of these dunes and compare them to field data. These favorable results demonstrate experimentally the relevance of the so-
Hersen, Pascal +2 more
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Earth Surface Processes and Landforms, 2010
AbstractBasically, sand dunes are patterns resulting from the coupling of hydrodynamic and sediment transport. Once grains move, they modify the surface topography which in turns modifies the flow. This important feedback mechanism lies at the core of continuous dune modelling.
Orencio Durán +2 more
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AbstractBasically, sand dunes are patterns resulting from the coupling of hydrodynamic and sediment transport. Once grains move, they modify the surface topography which in turns modifies the flow. This important feedback mechanism lies at the core of continuous dune modelling.
Orencio Durán +2 more
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1973
IN the preceding chapter we examined the longitudinal cross- section, cut parallel to a uni-directional wind, of an imaginary transverse dune whose length was so great that the end-effects could be neglected. We saw that as this cross-section grows bigger there comes a time when the initial rounded shape is no longer stable; the top advances faster ...
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IN the preceding chapter we examined the longitudinal cross- section, cut parallel to a uni-directional wind, of an imaginary transverse dune whose length was so great that the end-effects could be neglected. We saw that as this cross-section grows bigger there comes a time when the initial rounded shape is no longer stable; the top advances faster ...
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Simulating study on barchan dune
Chinese Geographical Science, 1998Barchan dune is one of the basic forms of eolian landform, it is usually moulded by high-concentration non-saturated wind-sand flow. The formation process of barchan dune begins from “wave-grain duality” of wind-sand movement, and goes through two developmental stages of sand material accumulating (high-concertration saturated wind-sand flow) and dune ...
Yuquan Ling +3 more
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BARCHAN-DUNE MOVEMENT IN IMPERIAL VALLEY, CALIFORNIA
Geological Society of America Bulletin, 1964The movement of 47 barchan dunes on the west side of Salton Sea, California, ranged from 325 to 925 feet over the 7 years between 1956 and 1963, an average of 82 feet per year. During the 15 years between 1941 and 1956, the movement of 34 of these dunes ranged between 350 and 1200 feet, an average of 50 feet per year.
Long, Joseph T., Sharp, Robert P.
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On the genesis and evolution of barchan dunes: Hydrodynamics
Physics of Fluids, 2020Barchans are an important signature of turbulent atmospheric and aquatic flows on parts of the Earth’s surface where the supply of sediments is scarce. Khosronejad and Sotiropoulos [“On the genesis and evolution of barchan dunes: Morphodynamics,” J. Fluid Mech.
Ali Khosronejad +3 more
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