嫩江沙地不同土壤质地类型起沙风速的研究

Study on Threshold Velocity of Sand-Driving Wind of Different Soil Types in Nenjiang Sandy Land

文章研究将沙粒在风速达到沙粒的起动风速时沙粒的瞬间起动方式分为4种,即:滚动、跳跃、悬浮和飞扬4种。在嫩江沙地的3种典型土壤(沙质黏壤土、沙质壤土、风沙土)质地类型区域分别观测记录了沙粒在出现这4种情况时的瞬时风速值大小。经分析得出,在沙质黏壤土、沙质壤土和风沙土等3种土壤类型区域,若能将风速分别控制在6.3、6.4和7.2 m.s-1,即可有效防止风沙流的产生。

The instantaneous moving mode of sand mass is divided into 4 types, namely： roiling, jumping, suspending, and running away, when the wind speed reaches the threshold velocity of sand-driving wind. The instantaneous wind speed of the sand mass was observed and recorded respectively in these areas of the 3 typical soils （ sandy loam, sandy soil and aeolian sandy soil） in Nenjiang sandy land at the 4 kinds of circumstances above. Results showed that in these areas of 3 kinds of soil types, sandy loam, sandy soil and aeolian sandy soil, we could prevent the wind-sand activity from creating when the wind speed would be controlled under 6.3m · s^-1 ,6.4m · s^- 1 or 7.2m · s^- 1