Analysis of Satellite Image Characters of Severe Storm Rainfall During the Flood of Yangtze River in 1998

WANG Likun, TAO Zuyu

(Department of Geophysics, Peking University, State Key Lab of Severe Storm Research, Beijing, 100871)

YANG Yang

(Information Center of Ministry of Water Resources, Beijing, 100761)

MA Yu, WANG Xu

(Meteorological Bureau of Xinjiang, Urumqi, 830002)

Abstract:: By the daily, 5-day, 10-day, monthly and seasonal mean images from hourly GMS-5 infrared images, an analysis of cloud characters of severe storm rainfall during the flood of Yangtze river in 1998 was made.The results show that the mean cloud images disclose the mean features of the severe storm systems. These mean images reveal not only the synoptic cloud systems but also the mesoscale convective cloud cluster. The long-term high water level of mid-Yangtze river and the frequent flood peak of the upper Yangtze river from the middle of June to the middle of August in 1998 was caused by the high frequent activity of convection. The 5-day mean and daily mean images show that the long severe rainfall of Yangtze river was produced by the meso-alpha scale cloud clusters in the end of July. Additionally, there is somewhat possible correlation between the daily mean cloud image and the daily precipitation. The future research is possibly expected to estimate the flux of water by means of the T_BB of the mean cloud images.
Key words:: flood; rainfall; satellite image

(R.D.1998-10-21 P.D.2000-01-20 Vol.36 No.1 pp.87-94)