雨滴粒径分布の鉛直構造の定式化

Abstract

Radar rain gage can observe rainfall instantaneously and widely. But the rainfall intensity on the ground is not equal to the rainfall intensity estimated from radar rain gage. To improve accuracy in the radar-estimated rainfall, we observe and analyze the vertical profile of the rain drop size distribution (DSD), and utilize the results into the new formulation of the vertical profile of DSD.The vertical profile of DSD is observed by a vertical pointing VHF Doppler radar in Japan named MU (Middle and Upper) radar.The MU radar can detect vertical profile of Doppler spectrum that are composed of both the rain drop itself and air movements. The DSD on the ground is observed by Disdrometer.Firstly, a new formulation of DSD which holds among rainfall type, rainfall intensity and DSD observed Disdrometer is developed. Secondly, the analysis of vertical profile of DSD in rainfall type are carried out to investigate the possibility of finding relations in DSD.