Wind Threshold Shear Velocities of Sands at Moistened State

LIU Xiao ping; DONG Zhi bao

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Wind Threshold Shear Velocities of Sands at Moistened State

- Wind Threshold Shear Velocities of Sands at Moistened State
- Bulletin of Soiland Water Conservation Vol. 21, Issue 2, Pages: 1-4(2002)
- 作者机构：
  
  中国科学院寒区旱区环境与工程研究所风沙物理与工程实验室,甘肃,兰州,730000
- 作者简介：
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- DOI：
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- Published：2002
- 稿件说明：
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LIU Xiao ping, DONG Zhi bao. Wind Threshold Shear Velocities of Sands at Moistened State[J]. Bulletin of Soiland Water Conservation, 2002, 21(2): 1-4.
DOI：

LIU Xiao ping, DONG Zhi bao. Wind Threshold Shear Velocities of Sands at Moistened State[J]. Bulletin of Soiland Water Conservation, 2002, 21(2): 1-4. DOI：

摘要

在土壤风蚀研究中，Bagnold建立的干沙子的起动风速与沙粒粒径关系的表达式已被广泛接受。然而，沙子含水率是影响沙粒起动风速的重要因子，因为沙子在湿润状态下，水分子与沙粒颗粒之间的拉张力增加了颗粒间的内聚力。通过风洞模拟实验研究了各种粒径的沙子在湿润状态下的起动风速。实验结果表明，湿沙的起动摩阻速度与干沙的起动摩阻速度之比——相对起动摩阻速度能更好地反映沙子含水率对起动风速的影响。建立了湿沙子的起动风速与沙粒粒径和沙子含水率的关系式。

Abstract

The widely accepted Bagnold type function to calculate threshold wind velocity or shear velocity was developed for dry sands. However

surface moisture is an extremely important variable controlling the entrainment process of sands by wind because the tensile force between the water molecules and sand grains produces cohesion. The detailed results from experiments in a laboratory wind tunnel are reported

in which the threshold shear velocities for a range of sand grains with different moisture content are measured. The results show that the functions relating threshold shear velocity and moisture content are different for different sized sands. Relative threshold shear velocity

the ratio of threshold shear velocity of sand at moistened state to that at dry state is better related to moisture content. For given grain size

the threshold shear velocity is proportional to the square root of moisture content.

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