Normally,according to the ice formation and melting progresses,river ice phenomena can be divided into three steps: ice period,freeze-up period and frost free period.A river ice mathematical model which can completely describe the processes of these three steps is made up of three partial models: hydraulic,thermo-mechanical and frozen models.Hydraulic models are applied to calculate the flow field and other hydraulic elements.Thermo-mechanical models are used to calculate the heat exchanges,water-temperatur...