摘要
输沙量及其强度是风沙危害程度的重要指标。在沙源丰富、地面干燥、平坦、无结构,无植被时,输沙量应正比于风速的三次方。但在输沙量与风速之间的经验回归方程中,V的方次有的大于3,这仅仅是数学计算产生的结果,为的是更好的配合回归曲线,V的方次高了,相应的V前面的系数必然会较小,反之亦然。风力可以吹动的最大沙粒质量与风速的6次方成正比。但风力能携带的总输沙量仍与风速的3次方成正比,二者不可混淆。一定风速下输沙的大颗粒多了,小颗粒就相对减少,总的输沙量仍然不变。
Sand transport rate and its intensity are important index of the severity of wind-sand disaster. In localities where the sand sources are abundant, ground surfaces are dry, flat and have no vegetation the sand transport rates are directly proprotional to three cube of wind velocity. The greatest sand grain mass which can be moved by wind force is directly proportional to the wind velocity to the sixth power , however, the total sand transport rate which can be moved by wind force is still direclty proportional to three cube of wind velocity. In the empirical regression equation of sand transport rate and wind velocity , the power of wind velocity may be higher than three, this was caused by the mathematical calculation.
出处
《中国沙漠》
CSCD
北大核心
1993年第2期14-18,共5页
Journal of Desert Research
