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Table 1 Summary of the hybrid PI-SWERL test used to assess surface dust emissivities and threshold friction velocities

From: Dust emission source characterization for visibility hazard assessment on Lordsburg Playa in Southwestern New Mexico, USA

Cumulative Test Time (s) Interval Time (s) Operation
0–540 540 Aspirate PI-SWERL bell and record PM10 concentration
0–60 60 No ring movement
61–105 45 Accelerate ring to 2000 RPM
106–165 60 Maintain ring at 2000 RPM
166–210 45 Accelerate ring to 3000 RPM
211–270 60 Maintain ring at 3000 RPM
271–315 45 Accelerate ring to 4000 RPM
316–375 60 Maintain ring at 4000 RPM
376–420 45 Accelerate ring to 5000 RPM
421–480 60 Maintain ring at 5000 RPM
481–540 60 Decelerate ring to 0 RPM