Results 141 to 150 of about 374 (187)
A Case Study of Moving Sand Dunes: The Barchans of the Kharga Oasis [PDF]
International Journal of Sciences, 2013 Recently we have proposed the use of the time series of Google Earth to investigate the motion of sand dunes. In this paper we consider a case study, applying the method to some barchans of the Kharga Oasis.
Amelia Carolina Sparavigna
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Width, height and slope relationships and aerodynamic maintenance of barchans
Geomorphology, 1998 Patrick A Hesp
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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 relationship between barchan size and barchan morphology: a case study from Northern Namibia
South African Geographical Journal, 2021Landform 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.
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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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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. R. Parteli
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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
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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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