Estimation of Liquid Fraction of Wet Snow by Using 2-D Video Disdrometer and S-Band Weather Radar

Wet snow may cause significant damage to humans and property, thus, it is necessary estimate the corresponding liquid fraction (FL). Consequently, FL of wet was estimated using a novel technique; specifically, particle shape irregularity (Ir) through coordinate information obtained 2-D video disdrometer (2DVD) measurements. Moreover, possibility quantitively estimating via Ir, based on temperature (T), examined. Eight snowfall cases from 2014 2016 were observed 2DVD installed in Jincheon, South Korea, analyze dominant properties physical variables snowflakes (i.e., terminal velocity (VT), density (ρs), FL) relationships according T ranges (−4.5 < (°C) 2.5) which can occur. It clarified that volume-equivalent diameter (D)–FL D–Ir depended T, relationship existed between Ir FL. The analysis results verified Yong-In Testbed (YIT) S-band weather radar T-matrix scattering simulation. D–FL implemented simulation, indicated simulated reflectivity (ZS) highly correlated with (ZO) under all classes. These features provide basis for quantitative estimation various values.