Journal Clean WAS (JCleanWAS)

In foothill rivers, large volumes of river sediments, derived from erosional processes, move along with the water. The sediment concentration increases during the high water or flood periods of rivers, and their sizes range from 0.01 mm to 200 mm. Sedimentation tanks are used to draw water from the river to prevent silting of irrigation canals. The size of sedimentation tanks depends on the physical and hydromechanical properties of river sediments, along with stream hydrological parameters. This article studies the hydromechanical properties of river sediments based on the results of field research conducted in the right-bank sedimentation tank, which is part of the Kokand hydrocomplex. Laboratory analysis of field studies showed that sediment concentrations in the Sokhsoi stream varied seasonally within a range of 1.02 to 5.04 kg/m3, and the average particle size is medium gravel (4 mm). As theoretical part of the research, the dependence of fall velocity on the shape and size of river sediments and the dependence of viscosity on concentration were studied. The higher the concentration, the lower the rate of decline of sediment. The results show that the value of the hydraulic size of sediments entering the right-bank tank fluctuated between 189 and 429 mm/sec, influenced by the concentration and shape of the sediment. The results of this study are of great importance not only for the design of sedimentation tanks but also for the study of the characteristics of mudflows