The Study on Effects of Meso-scale Terrain on Precipitation ofTorrential Rain by Numerical Modeling

The numerical modeling was conducted in this paper on investigation of the effects of meso-scale terrain on precipitation of torrential rain in Yangtze River and Huaihe River valleys on July 2,1991 by means of PSU/NCAR MM4. The elevation of Dabieshan Coteau was cut down to round about 50 m above sea level intentionally in the model topography. The outcomes of the numerical experiment revealed the fact that the topographical change of model results in the variation of the range and intensity of the meso-scale heavy-rain center, but the local topographical change had just influence on the local meso-scale heavy-rain system within a certain limited area.