THREE-DIMENSIONAL NUMERICAL SIMULATION OF BOD-DO FOR LARGE RESERVOIR

With a large reservoir as an example, a 3 D Biological Oxygen Demand (BOD) and Dissolved Oxygen (DO) model for large deep reservoirs was investigated by considering the effects of low concentration of dissolved oxygen and stratified temperature structure. A dissolved oxygen saturability equation was initially developed in the model. The influences of temperature on interfacial mass transfer coefficient and degradation rate coefficient and the restrained effects of low DO concentration on the degrading process were included in the model. The model is of great importance to accurate simulation of the temperature influential characteristics of water quality and the degrading law of organic pollutants in a large and deep reservoir.