Results 161 to 170 of about 937 (213)
The relationship between barchan size and barchan morphology: a case study from Northern Namibia [PDF]
Southern African Geographical Journal, 2021 Landform allometry has been a topic of inquiry since at least the 1970s. In this study, the presence of allometry is investigated for a barchan dunefield in northern Namibia.
Barend van der Merwe
exaly +4 more sources
Real barchan dune collisions and ejections [PDF]
Geophysical Research Letters, 2012 From high-resolution satellite imagery of barchan sand dunes, we provide geomorphological evidence of collisions that result in the ejection of a barchan from the wake of another barchan dune.
Chris H Hugenholtz, Thomas E Barchyn
exaly +1 more source
An application of CNN to classify barchan dunes into asymmetry classes [PDF]
Aeolian Research, 2022 Barchan morphometric data have been used as proxies of meteorological and topographical data in environments where this data is lacking (such as other planetary bodies), gaining insights into barchan dune field dynamics such as barchan collision and ...
Barend van der Merwe +2 more
exaly +2 more sources
Barchan‐Barchan Dune Repulsion Investigated at the Grain Scale
Journal of Geophysical Research F: Earth SurfaceAbstractBarchans 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
exaly +3 more sources
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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
openaire +1 more source
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 +2 more
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Barchans of Minqin: Morphometry
Geomorphology, 2007The barchans on the border of Minqin oasis, China, were surveyed. Our data reconfirmed that the height of slipface is proportional to the width of horns and the baseline can be roughly described by parts of an ellipse and a parabola. We attempted to study dune geomorphology using the theory of differential geometry.
Zhen-Ting Wang +3 more
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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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Barchan-barchan interactions with bidisperse grains
Proceedings of the 26th International Congress of Mechanical Engineering, 2021Willian Righi Assis +2 more
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Barchans of Minqin: Sediment transport
Geomorphology, 2008Spatial changes in the rates of sand transport are a fundamental control of dune morphology. A detailed field measurement of sand flux along the brink of a barchan was performed to explore the spanwise property of sand flux on the barchan surface. Setting the arc length of the brink at the tip of the longer horn to zero, it was found that the value of ...
Zhen-Ting Wang +5 more
openaire +1 more source