Acta Scientiarum Polonorum

Abstract: The paper presents the results of laboratory analysis of local scour in weir model with spillway, water basin and bed protection in downstream. The length of the bed protection was variable and was 0.50, 1.00, 2.00 m equal. The weir model was made in rectangular hydraulic channel which was 1.0 m wide. As a material to be eroted the sorted sand with d₅₀ = 1.1 mm was used. During the experiments the measurement of the depth of the scour and velocity in cross section of the end of bed protection was made. The results of laboratory tests enable to estimate the influence of turbulence characteristics for the size of local scour. Extending of bed protection zone downstream of structure providing reduction of flow turbulence and by this - slowing down of erosion process in time and limitation dimension of local scour.