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KMID : 1024520160250030345
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Journal of the Environmental Sciences
2016 Volume.25 No. 3 p.345 ~ p.359
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Case Study on the Physical Characteristics of Precipitation using 2D-Video Distrometer
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Park Jong-Kil
Cheon Eun-Ji
Jung Woo-Sik
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Abstract
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This study analyze the synoptic meteorological cause of rainfall, rainfall intensity, drop size distribution(DSD), fall velocity
and oblateness measured by the 2D-Video distrometer(2DVD) by comparing two cases which are heavy rainfall event case and a case that is not classified as heavy rainfall but having more than 30 mm h-1 rainrate in July, 2014 at Gimhae region.
As a results; Over the high pressure edge area where strong upward motion exists, the convective rain type occurred and
near the changma front, convective and frontal rainfall combined rain type occurred. Therefore, rainrate varies based on the synoptic meteorological condition. The most rain drop distribution appeared in the raindrops with diameters between 0.4 mm and 0.6 mm and large particles appeared for the convective rain type since strong upward motion provide favorable conditions for the drops to grow by colliding and merging so the drop size distribution varies based on the location or rainfall types.
The rainfall phases is mainly rain and as the diameter of the raindrop increase the fall velocity increase and oblateness
decrease. The equation proposed based on the 2DVD tends to underestimated both fall velocity and oblateness compared with observation. Since these varies based on the rainfall characteristics of the observation location, standard equation for fall velocity and oblateness fit for Gimhae area can be developed by continuous observation and data collection hereafter.
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KEYWORD
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2DVD, Rainrate, Rainfall intensity, DSD, Convective rain types, Precipitation types
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