Results 171 to 180 of about 1,253 (211)
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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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Barchan-barchan repulsion investigated at the grain scale
Barchans are 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. In this paper, we investigate the origins of this barchan-barchan repulsion by carrying out grain-scale numericalNicolao C Lima +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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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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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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The Journal of Geology, 1959
The crescentic sand-dune formation known as the "barchan" occurs extensively in the desert coast of southern Peru. Quantitative measurements were made on 75 of these to determine relationships between height, width, and length of horns. A consistently longer west horn was measured in most of the barchans, but this distortion cannot be readily explained.
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The crescentic sand-dune formation known as the "barchan" occurs extensively in the desert coast of southern Peru. Quantitative measurements were made on 75 of these to determine relationships between height, width, and length of horns. A consistently longer west horn was measured in most of the barchans, but this distortion cannot be readily explained.
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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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The ecology of Qatari barchan dunes
Qatar Foundation Annual Research Forum Volume 2013 Issue 1, 2013The mobile Barchan dunes in Qatar are restricted to the southeastern region of the country. They are currently a disappearing natural habitat, due to the northwesterly Al Shamal winds which are scouring the landscape and spreading desertification as they pass. The study's aim was to understand the ecology of an active dune, in terms of resident species
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Revealing the Intricate Dune-Dune Interactions of Bidisperse Barchans
Journal of Geophysical Research F: Earth Surface, 2022Willian R Assis +2 more
exaly