Friction wind speeds in dust devils: A field study

被引：36

作者：

Balme, M

Metzger, S

Towner, M

Ringrose, T

Greeley, R

Iversen, J

机构：

[1] Arizona State Univ, Dept Geol Sci, Tempe, AZ 85287 USA

[2] Kautz Environm Consultants Inc, Reno, NV 89502 USA

[3] Open Univ, Planetary & Space Sci Res Inst, Milton Keynes MK7 6AA, Bucks, England

[4] Iowa State Univ, Dept Aerosp Engn & Engn Mech, Ames, IA 50011 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2003年 / 30卷 / 16期

关键词：

D O I：

10.1029/2003GL017493

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Using in-situ field measurements, we determined surface friction velocities (u(*)) and aerodynamic roughness heights (z(0)) at the base of 10 dust devils. z(0) values agree closely with previous studies in this region and range from 0.1 to 1.0 cm. The peak u(*) coincide with the largest wind speed measurements within the dust devil and range from 0.9 to 2.4 ms(-1). Surface friction velocities are sufficient to lift all types of windblown material from dust to pebble sized particles. Peak u(*) values for dust devils appear to be a linear function of the peak wind speed measured at similar to2 m height within the dust devil. This provides a simple approximation for estimating surface shear stress for dust devils.

引用

页码：1 / 1

页数：4