中国沙漠 ›› 1986, Vol. 6 ›› Issue (2): 8-15.

• 论文 • 上一篇    下一篇


邹桂香1, 高宏智1, 董光荣2   

  1. 1. 中国科技大学;
    2. 中国科学院兰州沙漠研究所
  • 出版日期:1986-06-20 发布日期:1986-06-20


Zou Cuixiang1, Gao Hongzhi1, Dong Guangrong2   

  1. 1. University of Science and Technology of China;
    2. Lanzhou Institute of Desert Research, A cademia Sinica
  • Online:1986-06-20 Published:1986-06-20

摘要: 本文在总结野外资料的基础上,讨论了局部沙通量系数、断面通量系数与高度、粒径之间的关系,验证计算沙通量-般公式,结果良好。

Abstract: Wind-sand flow is the most important gassolid flow in the nature. Many papers on it have been published. Bagnold, R.A. showed that the sand flux is directly proportional to cube of wind speed1.However, the proportional coefficient is unknown. Reference2 fully discussed the transfer of sand in the surface layer and gave the expression of computing the transport rate of sand, but some quantities are not conven-ient to measure. Based on the outdoor measurement, this paper develops a general computation method of sand flux, which is suitable for engineering application. Measurement suggests that the sand flux per unit time and orientable area can be expressed as q=a(v-v0)3(1) where V and v0 are wind speed and starting-sand wind speed at an altitude of ten meters, is local flux coefficient. The change of with the altitude is found as a=Ae-Bh(2) substjtuting ∑q(2) into ∑q(1) one gets q=Ae-Bh(V- V0)3(3) The transport rate of sand at an orientable section per unit width can be got by integrating???(4) where β(=A/B) is section flux coefficient. The value of depends on the average diameter of sand and is isotropic for plane desert. The total transport amount of sand passing through a fixed section per unit wrdth in a year is???(5) where 1 and m are the subinterval numbers of wind direction and wind speed respectively, θi, Is the included angle between the fixed section and wind direction i, Δti j is the time when the wind possesses the direction i and speedvj. The key to compute the transport amount of sand is to find the s ection flux coefficient P and starting-sand wind Speed Vo.Reference(3) shows the linear relationship between β and diameter of sand:β=C + fD(6) where c and f are constants depending on surface conditions, D is the average diameter of sand.By measurement in Qing Hai province, the linear relationship can be written as β=0.0654D +0.0183(7) for plane desert.The starting-sand wind speed Vo depends on the sige of sand.