Aeolian Sand Structure at the Brink of Barchans

doi:10.7522/j.issn.1000-694X.2018.00142

Journal of Desert Research ›› 2019, Vol. 39 ›› Issue (6): 76-82.DOI: 10.7522/j.issn.1000-694X.2018.00142

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Aeolian Sand Structure at the Brink of Barchans

Liu Xuyang^1,2, Ning Wenxiao^1,2, Wang Zhenting¹

1. Research Laboratory for Desert and Desertification, Northwest Institute of Eco-Environment and Resources(Preparations), Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2018-09-30 Revised:2018-11-20 Published:2019-11-14

Abstract

Abstract: The aeolian sand structure at the brink of barchans is critical to the understanding of the dune morphodynamic process, and thus providing the basic data support and theoretical foundation for the protection and ecological reconstruction in arid regions. In the current study, the traditional passive sand-collectors are used to observe the sand movement at the height range of 0-60 cm above the barchan brink in the cases of positive and reverse wind directions respectively, and then the obtained mass flux density distribution curves are analyzed by means of function fitting. It is shown that the amount of sediment driven by the positive winds is a power function of height, and the mass transport mainly occurs in the height of 0-30 cm; Whereas in the case of reverse wind direction with the increase of height, the sediment amount increases first and then begins to monotonely decrease at the height of 30-50 cm the change trend approximately obeys the double Gaussian function.

Key words: aeolian sand structure, barchan, brink, power function, double Gaussian function

CLC Number:

P931.3

Liu Xuyang, Ning Wenxiao, Wang Zhenting. Aeolian Sand Structure at the Brink of Barchans[J]. Journal of Desert Research, 2019, 39(6): 76-82.

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Aeolian Sand Structure at the Brink of Barchans

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