Wpływ szorstkości umocnień w dolnym stanowisku jazu na lokalne rozmycia dna

In paper are presented investigation results of scour downstream of weir for different roughness of bed protection. Investigations were conducted on model construction with stilling pool and horizontal bed protection about 1.0 m long. The bed protection in downstream was made as concrete and as riprap with relative roughness k = 0.028. As bed material in experiments was used sand (d50 = 1.1 mm, (d84/d16)0.5 = 1.77). In result of use rip-rap as bed protection downstream obtained reduction of velocity and turbulence intensity of stream near the bed on the length in downstream. It was infl uence on decrease of sizes of local scour.