Models for simulating the propagation of fluctuating pressure in gaps of stilling basin slab

Two models, namely transient flow model and seepage flow model respectively, are proposed to describe the propagation of fluctuation pressure in gaps of stilling basin slab. The applicability, advantages and weak points of each model are investigated. The theoretical analysis and numerical simulation show that two models are in intrinsic consistent with each other but their applicability are different. The transient modelis is suitable for both situations in which the crevice is seriously blocked or hydraulic transient taken place, but the seepage model can only be used to describe the former situation.