Diagnosis of “96.8” Torrential Rain with the Scale-seperation Kinetic Energy Equation

Using the scale seperation kinetic energy equation, the generations and transformations of kinetic energy during the torrential rain process of North China in August 1996 are calculated. The results show that during the developing process of “96.8” torrential rain, the kinetic energy was gradually decreased, and so was the kinetic energy transformation. Before the torrential rain, GKMS played the most important role, and GKS the second, whereas GKM dissipated a few energy. During the torrential rain, GKMS produced the energy, but less than before apparently, GKM also produced energy, the energy conversions mainly came from low level. After the torrential rain, the producers of the kinetic energy were still greater than zero, at that time GKS was the most important one and the amount was less than the first two periods, and the conversions appeared over upper level. It is shown that during the torrential rain process the total producers of kinetic energy were always positive, they mainly appeared over high level, but the amount of kinetic energy was decreased gradually. The conversion of kinetic energy was from low level to high level, the horizontal term played the main role, and it was an energy transformation process of scale reduction.