Rainfall Retrieval and Flooding Monitoring in China using TRMM Microwave Imager (TMI)

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The ability of the Tropical Rainfall Measuring Mission Microwave Imager (TRMM/TMl) for rainfall and flooding detection has been demonstrated in this study. A dynamic cluster K-mean methad was presented to classify surface types and rain areas. Based on the TMI :measurements and surface observations during the Huaihe River Basin Energy and Water Cycle Eeeriment, the scattering index over land (SIL) was developed and a rain rate (RR) retrieval algorithm of TMI was established, in which the RR is the function of SIL and PCT_85 (polarization corrected temperature at 8GHz). Compared with the rainfall derived from the weather radar and the products of TMI(2A12) and TRMM/PR(2A25), the given surface classification method and the rain rate retrieval algorithm can provide reasonable estimates of rain areas and rain rates. On the baisis of TMI measurements, four methods, the classification method, the soil wetness index (SWI) method, the polarization difference index (PDI) method, and the polarization ratio index (PRl) method, were utilized to monitor flooding and study soil wetness in the Yangtze River basin and the Huaihe River basin during summer 1998. Compared with the images provided by L-band Synthctie Aperture Radar (L-SAR) and Radar Satellite (Radars at) and the figures delived from daily rain gauge data based on the Z-index method, the four methods of flooding detection were proved to be successful, among which the PRI method was best.
社団法人日本気象学会の論文
2001-03-25

Rainfall Retrieval and Flooding Monitoring in China using TRMM Microwave Imager (TMI)

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