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Journal of Arid Land  2019, Vol. 11 Issue (5): 674-684    DOI: 10.1007/s40333-019-0058-x
Orginal Article     
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 YIN*(), Guoxiang CHEN, Junhuai YANG
College of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China
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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.

Key wordsthreshold shear velocity      saline sand      barchan dune      linear dune      crust thickness      moisture content      Qaidam Basin     
Received: 18 April 2018      Published: 10 October 2019
Corresponding Authors: Shuyan YIN     E-mail:
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The first and second authors contributed equally to this work.

Cite this article:

Chao LI, Zhibao DONG, Shuyan YIN, Guoxiang CHEN, Junhuai YANG. 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. Journal of Arid Land, 2019, 11(5): 674-684.

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