关键词: 激光雨滴谱仪, 雨滴谱, 暴雨, 速度谱, μ-λ关系, Z-I关系

Abstract: Based on the observation data of the OTT Parsivel laser raindrop disdrometer during the heavy rain processes in central and southern Hebei Province during 2016-2017, the precipitation microstructural parameters, the contribution of precipitation particles at different scales to rain intensity, raindrop size distribution under different rainfall intensity and velocity spectrum distribution  for three different types of heavy rainstorm processes were analyzed. The raindrop size distribution under different rainfall intensities in central and southern Hebei Province presented basically single peak, raindrop spectrum of the low trough cold front type of rainstorm was the narrowest and that of the low vortex type of rainstorm was the second, that of the warm shear line type of rainstorm was the widest. The average values of average diameter and peak diameter of the low vortex type of rainstorm was minimum, followed by the low trough cold front rainstorm, and that of warm shear line type of rainstorm was largest. The average values of the volume median diameter and the mass-weighted average diameter of the low trough-cold front rainstorm was minimum, followed by the low vortex rainstorm, and that of  warm shear line type of rainstorm was largest. The rainstorm process in central and southern Hebei Province was mainly dominated by small raindrops less than a diameter of 1.0 mm. The proportion of the number concentration of larger raindrops larger than a diameter of 4 mm to  total number concentration was the smallest, and the proportion of rain intensity of that to total rain intensity was minimal. Raindrop size distribution of three different rainfall intensity  presented single distribution, when it presented double distribution, the corresponding rain intensity position was different under three different types of rainstorms. For the velocity spectrum, the number of raindrops under different types of rainstorms had the same center, and this center point located below the empirical curve. The Z-I relationship in central and southern Hebei Province underestimated the precipitation of the low trough cold front rainstorm and overestimated the precipitation of the low vortex rainstorm and warm shear line type of rainstorm, especially the low vortex type of rainstorm.

Key words:  , laser raindrop spectrometer, raindrop size distribution, rainstorm, velocity spectrum distribution, μ-λ relationship, Z-I relationship