A STUDY ON THE VELOCITY AND PRESSURE FIELDS AROUND GROUNDSILL FROM RESULTS OF 2D HYDRAULIC MODEL EXPERIMENTS AND NUMERICAL SIMULATIONS

Abstract

Fixed bed hydraulic model experiments were carried out for a gentle slope block type groundsill with a flexible structure. Numerical simulations were also performed to obtain the seepage flow included velocity field and the pressure field around the groundsill. The numerical and experimental results show a good agreement. It is shown that vertical hydrodynamic forces acting on the blocks have local maximum value and the pressure varies periodically at the hydraulic jump. The computations also show that pore water pressure increases with decreasing permeability of materials under the structure, decreases at the gap of the groundsill blocks. In scoured hole, bottom velocity of submerged hydraulic jump is several times bigger than the value of undular hydraulic jump’s reverse velocity.