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Journal of Arid Land

, Volume 11, Issue 5, pp 674–684 | Cite as

Influence of salinity and moisture on the threshold shear velocity of saline sand in the Qarhan Desert, Qaidam Basin of China: A wind tunnel experiment

  • Chao Li
  • Zhibao Dong
  • Shuyan YinEmail author
  • Guoxiang Chen
  • Junhuai Yang
Article
  • 36 Downloads

Abstract

Determination of the threshold shear velocity is essential for predicting sand transport, dust release and desertification. In this study, a wind tunnel experiment was conducted to evaluate the influence of salinity and moisture on the threshold shear velocity of saline sand. Saline sand samples (mean particle size of 164.50–186.08 µm and the total silt, clay and salt content of 0.80%–8.25%) were collected from three saline sand dunes (one barchan dune and two linear dunes) in the Qarhan Desert, Qaidam Basin of China. Original saline sand samples were placed in two experimental trays for wet and dry processing to simulate deliquescence and desiccation, respectively. Surface moisture content ranging from 0.30% to 1.90% was generated by the steam method so that the saline sand can absorb water in a saturated water vapor environment. The motion of sand particles was determined by the observers with a solid laser. The laser sheet (0.80 cm thick), which was emitted by the solid laser, horizontally covered the sand surface and was bound to the sand. Results show that the cohesion of saline sand results from a combination of salt and water. The threshold shear velocity increases exponentially with the increase in crust thickness for the linear sand dunes. There is a positive linear correlation between the original moisture content and relative threshold shear velocity. The threshold shear velocity of dewatered sand is greater than that of wet sand with the same original moisture content. Our results will provide valuable information about the sand transport of highly saline soil in the desert.

Keywords

threshold shear velocity saline sand barchan dune linear dune crust thickness moisture content Qaidam Basin 

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Notes

Acknowledgements

This research was funded by the National Natural Science Foundation of China (41601002, 41871008).

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Copyright information

© Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Chao Li
    • 1
  • Zhibao Dong
    • 1
  • Shuyan Yin
    • 1
    Email author
  • Guoxiang Chen
    • 1
  • Junhuai Yang
    • 1
  1. 1.College of Geography and TourismShaanxi Normal UniversityXi’anChina

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