Numerical Simulation of the Evolution of a Mesoscale Cloudcluster over the Middle and Lower Reaches of the Changjiang River

A five level mesoscale primitive equation model has been used to simulate the initiation, mature and weakening stages of a mesoscale cloudcluster over the middle and lower reaches of the Changjiang River in 1982. The results show that the evolution of the cloudcluster with heavy rainfall can be simulated by this model with observed large scale regular data.Furthermore, the model has been modified to incorporate the orographic effects. In comparison to the numerical experiment without terrain influences, the orographic effects in the model would contribute to the formation of E-W shear line and promote the development of the cloudcluster