A one-dimensional simulation model for a closed-cycle salt-gradient solar pond (CCSGSP) is developed. It simulates the transient behavior of CCSGSP using finite difference method. Validation of some parts of the model is presented using data from the RMIT solar pond. Close correlation between computed and measured data was obtained. Three modes of salt recycling are also presented. Simulation results show that seasonal surface flushing with annual bottom salinity maintenance done during winter is more practical and desirable. Gradient maintenance may likewise be done during this period. The CCSGSP model (CCSGSPM) is a useful tool for estimating the area requirement of an evaporation pond (EP) for a particular solar pond (SP) facility.