Abstract: Investigating the flow field of plunge pool is the bas is of studing the energy dissipation problem in plunge pool. However, the flow features in plunge pool have not been understood fully up to now. Not only little has been obtained for the numerical simulation (especially the 3-D numerical simulation), but the 3-D flow field has not been measured in physical model. In fact, it is the combination of numerical and experimental methods that is effective in the research of such complicated flow as in plunge p...