Raindrop shapes and fall velocities in “turbulent times”
<p>Raindrop shapes and fall velocities measured by 2-dimensional video disdrometer are presented for 2 high-wind/turbulent events. The shapes were reconstructed using a relatively new technique. 10 m height wind sensor data are used to derive proxy-indicators for turbulent intensiti...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2019-06-01
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| Series: | Advances in Science and Research |
| Online Access: | https://www.adv-sci-res.net/16/95/2019/asr-16-95-2019.pdf |
| Summary: | <p>Raindrop shapes and fall velocities measured by
2-dimensional video disdrometer are presented for 2 high-wind/turbulent
events. The shapes were reconstructed using a relatively new technique. 10 m
height wind sensor data are used to derive proxy-indicators for turbulent
intensities. Our results show strong gusts, directional wind shifts (i.e.
shear) and/or inferred high turbulence intensity are correlated with reduced
fall speeds, reaching values <span class="inline-formula">∼25</span> %–30 % less than the
expected values, i.e. sub-terminal fall speeds. Significant percentage
(20 %–35 %) of asymmetric drops (<span class="inline-formula"><i>></i> 2</span> mm) deviating from the most
probable axisymmetric shapes were also detected for some events with high
turbulent intensities.</p> |
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| ISSN: | 1992-0628 1992-0636 |