关键词: 风况, 起沙风, 输沙量, 合成输沙势, 风沙活动期

Abstract: In this study a statistical analysis on the wind regime of Naiman banner in Horqin sandy land in past five years was made, meantime the resultant sand-transporting potential in the study area was explored. The results showed that:(1)The threshold wind of transporting sand in the study area between March to May were most frequent, with an accumulated frequency of 38%~58%. Mean and maximum wind velocities were 6.0~7.5 m·s^-1 and 9.5~16.9 m·s^-1 respectively. Such wind regime features, coupling with surface thawing, barren, drought and loose structure in the same period, initiated a phase of wind-sand activity.(2)During the phase of wind-sand activity the wind environment in the area roughly exhibited a bimodal wind regime, the northwest wind held a leading place, with a frequency of 54%; followed by south wind and southwest wind, with a frequency of 38%.(3)While throughout the phase of wind-sand activity resultant sand-transporting potential(RDP) was 66.7 VU(m·s^-1 is the unit of wind speed), resultant sand-transporting direction(RDD) was 113°ESE, this shows that the study area belongs to a high wind energy environment, sand activity is dominated by wind erosion and sand is transported southeastward.

Key words: wind regime, threshold wind of transporting sand, sand transportion rate, resultant sand-trans-porting potential, phase of wind-sand activity