Wind Regime and Resultant Sand-transporting Potential of Naiman Banner in Horqin Sandy Land during Past Five Years

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.