Data Comparative Analysis of 2DVD and Parsivel2 Raindrop Spectrometer

Abstract

Observations in September 2018 from 2-D video disdrometer (2DVD) and 1-D disdrometer (Parsivel2) are used to study the performance difference of the two instruments at the same location in the campus of CUIT (Chengdu University of Information Technology). The characteristics of rainfall intensity, raindrop size distribution (DSD) and particle number density from the two instruments respectively are analyzed and compared according to rainfall intensity classification. The results show that 1) In the process of light rain, moderate rain, heavy rain and rainstorm, the DSD of the two instruments shows a single peak characteristic, and the peak value appears at the raindrop diameter of about 0.6mm. 2) For the number of raindrops with diameter less than 2mm, 2DVD detection value is greater than Parsivel2 detection value, and the D-value increases with the increase of rainfall intensity. 3) With the increase of rainfall intensity, the proportion of raindrops with diameter less than 2mm to the total raindrops decreases. 4) Parsivel2 can hardly detect raindrops with a diameter less than 0.3mm, while 2DVD has a better detection effect on raindrops with a diameter of about 0.19mm, and the detection ability for raindrops with a diameter less than 1mm is far lower than 2DVD. 5) The rainfall in Chengdu is mainly composed of small raindrops with a diameter of about 1mm. 6) The peak value of rainfall intensity of 2DVD is prior to that of Parsivel2, and the two peaks are basically the same in light rain, but with the increase of rainfall, the peak value of 2DVD will be greater than that of Parsivel2.