环境科学
气象学
空速
下降(电信)
下蒙蒙细雨
遥感
计算机科学
物理
工程类
航空航天工程
地质学
电信
降水
作者
Cheng‐Ku Yu,Pei‐Rong Hsieh,Sandra E. Yuter,Lin-Wen Cheng,Chia‐Lun Tsai,Che-Yu Lin,Ying Chen
标识
DOI:10.5194/amt-9-1755-2016
摘要
Abstract. Acquisition of accurate raindrop fall speed measurements outdoors in natural rain by means of moderate-cost and easy-to-use devices represents a long-standing and challenging issue in the meteorological community. Feasibility experiments were conducted to evaluate the indoor accuracy of fall speed measurements made with a high-speed camera and to evaluate its capability for outdoor applications. An indoor experiment operating in calm conditions showed that the high-speed imaging technique can provide fall speed measurements with a mean error of 4.1–9.7 % compared to Gunn and Kinzer's empirical fall-speed–size relationship for typical sizes of rain and drizzle drops. Results obtained using the same apparatus outside in summer afternoon showers indicated larger positive and negative velocity deviations compared to the indoor measurements. These observed deviations suggest that ambient flow and turbulence play a role in modifying drop fall speeds which can be quantified with future outdoor high-speed camera measurements. Because the fall speed measurements, as presented in this article, are analyzed on the basis of tracking individual, specific raindrops, sampling uncertainties commonly found in the widely adopted optical disdrometers can be significantly mitigated.
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