This paper concerns with numerical modelling of flow field in a tidal river and in the vicinity of intake of a nuclear power plant. The hybrid method of fractional steps presented in[1] was adopted in this modelling. In order to simulate the local flow field nearby the water intake meticulously, the technique of the match of the coarse and fine grids was used. The numerical results are in good agreement with the measurements of the main current. The local flow field nearby the intake provides the assessment of the sediment transport characteristics in the vicinity of intake of the nuclear power plant with the flow data in detail.

In this paper a numerical simulation for intake water temperature and aquatic environment temperature field of cooling water system for the thermal power plant under the action of tide motion by using the hybrid method of fractional steps with L_∞-stability^[5] is given, and its hydro-thermal behavior and environment pollution are predicted. The computed elevation of water and velocity field are in good agreement with the prototype observations, and the average intake water temperature and aquatic environment temperature distribution are also in consistent very well with the laboratory experiments.