| Title: |
Friction wind speeds in dust devils: a field study |
| Authors: |
Balme, Matthew; Metzger, Stephen; Towner, Martin; Ringrose, Tim; Greeley, Ronald; Iversen, James |
| Publication Year: |
2003 |
| Collection: |
The Open University: Open Research Online (ORO) |
| Description: |
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 ~2 m height within the dust devil. This provides a simple approximation for estimating surface shear stress for dust devils. |
| Document Type: |
article in journal/newspaper |
| Language: |
unknown |
| Relation: |
Balme, Matthew ; Metzger, Stephen; Towner, Martin ; Ringrose, Tim ; Greeley, Ronald and Iversen, James (2003). Friction wind speeds in dust devils: a field study. Geophysical Research Letters, 30(16) p. 1830. |
| Availability: |
https://oro.open.ac.uk/4954/ |
| Accession Number: |
edsbas.777FCA8E |
| Database: |
BASE |