Freezing desert soil changes the wind-sand movement pattern.

Area of Science:

• Geosciences
• Environmental Science
• Earth Science

Background:

• Mobile sand dunes in seasonally frozen deserts experience surface freezing in winter.
• Frozen soil layers alter the natural wind-sand transport processes.
• Understanding these changes is crucial for desertification control and environmental management.

Purpose of the Study:

• To investigate the impact of frozen soil layers on wind erosion rates.
• To analyze changes in sediment transport patterns under frozen conditions.
• To quantify the reduction in wind-sand activity due to soil freezing.

Main Methods:

• Wind tunnel experiments were conducted on frozen and nonfrozen desert soils.
• Soil moisture content varied from 1% to 5%.
• Wind erosion rate and sediment transport patterns at different heights were measured.

Main Results:

• Wind erosion rate decreased by 6-52% for frozen desert soil compared to nonfrozen.
• Optimal soil moisture (4% nonfrozen, 3% frozen) reduced wind erosion by over 65% compared to dry sand.
• Frozen soil exhibited a distinct sediment transport profile, with increased saltation (approx. 80%) compared to nonfrozen soil.

Conclusions:

• Freezing desert soil has an inhibitory effect on wind-sand activity.
• Frozen soil layers promote higher particle movement and increase the transition from creep to saltation.
• Effective wind-sand control can be achieved by inducing soil freezing.