STUDY ON THE DETECTION METHOD FOR THE LOCALIZED TORRENTIAL RAINFALL USING VORTEX TUBES

Abstract

 Recently, the localized torrential rainfall occur frequently in urban area, and it cause internal water flooding in a short time. In order to prevent such disaster, we studied the detection method for the localized torrential rainfall using vortex tubes observed by phased array weather radar installed in Osaka and Kobe. Phased array weather radar can observe three-dimensional rainfall and doppler velocity every 30 seconds and detect vortex tubes with vorticity of positive and negative paires inside the rapidly developing cumulonimbus cloud. In this study, we first created CAPPI data with 250m special resolution, and studied the method of detecting vortex tubes. Secondly, we proposed the spatiotemporal density of vortex tubes for detecting the organized cumulonimbus clouds with rainfall intensity of 50mm/h or more that maintain more than 10 minutes.