关键词: 塔克拉玛干沙漠, 起沙风速, 时距换算, 高程换算

Abstract: Sand-driving wind is one of the important factors in the study of aeolian sand movement, therefore it is of great significance to determine the threshold velocity accurately for the estimation of sand transport rate and recommendaton of proper sand control measures. On the basis of field observation this paper attempts to make out the fluid threshold and impact threshold and adapt them for different heights and time durations. Consequently, the wind data derived from the meteorological observatory will be more efficiently used in the study of sand movement. By means of the work mentioned above, the following results have been reached.At the height 2m above ground surface.for naturally mixed sands,the instant fluid and impact threshold velocities are 6.0 and 5. 0m/s respectively,equivalent to one minute averages of 5.2 and 4. 3m/s respectively. While averaging on ten minutes duration, the fluid and impact threshold velocities are 5.7 and 4. 7m/s respectively. Both fluid and impact thresholds have been adopted for the height of 11.4m (the height of anemometer tower) at which the instant velocities for the former and later are 7.8 and 6.63m/s respectively, equivalent to 7. 4 and 5.97(≈6.0)m/s of ten minute averages.

Key words: Taklimakan desert, threshold velocity of sand-driving wind, time duration adaptation, height adaptation