Abstract
A refined computational method has been developed to predict local scour on a sand bed due to cooling-water jets discharged from power plants. The amount of sand particles detached from a sand bed is evaluated with a pick-up rate model proposed in the non-equilibrium conditions. The transportation of the picked up sands is calculated with an advection-diffusion equation with turbulent diffusivity and settling velocity. In order to increase the applicability to actual field, friction force caused by wave motions and various bottom boundary conditions are taken into account in the refined method.
The computational method is applied to an actual field in front of power stations, where sand bed profiles are surveyed. As a result of computation, while the predicted width of the scoured area is narrower than the measured results, it is shown that the vertical profiles on the center line, where the sand bed is most deeply scoured, are satisfactorily predicted with the present method.
