Analysis of Convective Precipitation and Lightning Based on Multiscale Wavelet Edge Detection
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Abstract:
Based on the concept of the multiscale wavelet edge detection, an algorithm is presented to process the radar reflectivity data, so to identify convective cloud echoes effectively and retrieve convective precipitation. Taking a severe thunderstorm with heavy precipitations happened in Nanjing between 6 and 7 July 2009 as an example, a case study is conducted, focusing on the 180 minutes with relatively dense lightning flashes and severe precipitation. The convective cloud echo areas are then recognized by means of the multiscale wavelet edge detection algorithm with the radar reflectivity data from Longwang station every 6 minutes. The corresponding convective precipitation is inversed through ZI relation. The lightning flashes in the same 6 minutes are calculated, so the relation between convective precipitation and lightning can be analyzed. Results show that Rain Yields per flash (RPF) ranges from 7.47×106 to 4.46×107 kg, with average value being 1.72×107 kg; the nonlinear curve fitting equation of precipitation intensity and lightning frequency is established.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.