Friction wind speeds in dust devils: A field study | Zendy

Balme Matthew | Zendy; Metzger Stephen | Zendy; Towner Martin | Zendy; Ringrose Tim | Zendy; Greeley Ronald | Zendy; Iversen James | Zendy

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Friction wind speeds in dust devils: A field study

Author(s) -

Balme Matthew,

Metzger Stephen,

Towner Martin,

Ringrose Tim,

Greeley Ronald,

Iversen James

Publication year - 2003

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/2003gl017493

Subject(s) - wind speed , atmospheric sciences , range (aeronautics) , shear velocity , lift (data mining) , aeolian processes , mineral dust , wind tunnel , surface roughness , geology , environmental science , meteorology , physics , mechanics , materials science , geomorphology , aerosol , turbulence , quantum mechanics , computer science , composite material , data mining

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.

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