NUMERICAL SIMULATION OF THE DEVELOPMENT FOR CONVECTIVE CLOUDS OVER TERRAIN

This paper describes a two-dimensional elastic cloud model by using a terrainfollowing coordinate transformation,which can be used to simulate the development of convective cloud over irregular lower surface. The model is tested from two aspects. First,the initialization or start-up procedure is testd. The results indicate:as long as the initialization time scale is larger than 2,PAI/N (PAI=3.14156.N the Brunt-Vaisala Frequency),this time scale only affects the strength of the connective cloud, and doesn't affect the developing trend of the connective cloud.Second,the influence of upslope and downslope on the development of convective clound is simulated. It is found that:1. An upslope can promote the development of cloud validly,and can produce convective cloud as long as the temperature and humity condition is adaptable;2. A downslope can restrain the development of convective cloud. The results prove:the model is stable and reliable,and is our work base for simulating convective cloud in future.