GIDROTEXNIKA INSHOOTLARINING QUYI BYEFIDAGI GRUNTLI O‘ZANLARDA MAHALLIY YUVILISH ZONASINING OʻLCHAMLARINI ANIQLASH HISOBI

This study investigates the determination of the geometric dimensions of a local scour zone developing within a cohesive soil section downstream of a hydraulic structure. The influence of the main hydraulic characteristics of the flow, including discharge, mean flow velocity, flow depth, and hydraulic slope, as well as the physical, mechanical, and granulometric properties of the soil, on the development of local scour is examined. A computational approach is proposed to assess the intensity and spatial characteristics of scour by considering the interaction between the dynamic action of the flow and the resistance of the channel bed. The principal geometric parameters of the scour zone include the maximum scour depth, longitudinal extent, transverse dimensions, and location of the maximum scour point. Relationships between the hydraulic characteristics of the flow, soil properties, and geometric parameters of the scour zone are established based on the analysis of the governing hydraulic and sediment-related parameters. The obtained results can be used to assess channel-bed deformation downstream of hydraulic structures, determine the dimensions of local scour zones, and provide a basis for designing appropriate scour protection measures. The proposed approach contributes to improving the reliability of hydraulic structures and the efficiency of engineering solutions for mitigating local bed erosion.

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