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Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (2): 104-113.DOI: 10.7522/j.issn.1000-694X.2022.00110

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Sand-dust horizontal flux of different surfaces in the western margin of Badain Jaran Desert

Yuting Xiao1,2,3(), Guoming Zhang1,2,4,5(), Chang Hong1,2,3, Lianyou Liu1,2,3, Yanyan Yang6, Yu Gu1,2,3, Yong Liu1,2,3, Mingzhu Xiang1,2,3, Shufeng Qu1,2,3, Xuran Sun1,2,3   

  1. 1.MOE Key Laboratory of Environmental Change and Natural Disasters /, Beijing Normal University,Beijing 100875,China
    2.MOE Engineering Research Center of Desertification and Blown-sand Control /, Beijing Normal University,Beijing 100875,China
    3.Faculty of Geographical Science /, Beijing Normal University,Beijing 100875,China
    4.School of National Safety and Emergency Management, Beijing Normal University,Beijing 100875,China
    5.Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    6.Institute of Ecological Conservation and Restoration,Chinese Academy of Forestry,Beijing 100091,China
  • Received:2022-05-04 Revised:2022-09-05 Online:2023-03-20 Published:2023-04-12
  • Contact: Guoming Zhang

Abstract:

The western margin of the Badain Jaran Desert is an important cross-section of sand transportation on the alluvial plain in the middle and lower reaches of the Heihe River. Five typical surfaces (playa, reed land, salt-alkali land, shifting sandy land, nabkha dune) were selected in this study. MWAC dust collectors were used to carry out field observation of near-surface sand-dust transport flux. The horizontal flux and distribution characteristics of sand-dust at different surface heights (10 cm, 25 cm, 50 cm, 85 cm) were observed and analyzed during the observation period. Results showed that the horizontal flux of sand-dust decreased with height following an exponential function. Within 0-85 cm height, the horizontal flux and distribution characteristics of sand-dust on the five typical surfaces were significantly different and the horizontal flux of sand-dust in the 0-10 cm accounted for the largest proportion. The horizontal flux of sand-dust showed a trend that shifting sandy land>playa>reed land>salt-alkali land>nabkha dune. Shifting sandy land and playa are the main sediment transport sources in the western margin of the Badain Jaran Desert. The density of vegetation coverage, the area size of exposed space and the characteristics of soil gravel content directly affected the sand-dust flux that were transported on the surface. Variations of wind speed were likely to affect the distribution of horizontal flux. When wind speed was increased, both the initiated sand particle size and the sand-dust flux were increased. The results could help to understand the dust transport process in the western desert margin, as well as the regional sandstorm process.

Key words: Badain Jaran Desert, sand-dust, horizontal flux, distribution characteristics

CLC Number: