Author: Bobomurodov, Furkat Farkhod ugli; Isakov, Alisher Nemat ugli; Khazratov, Alisher Rahmatillo ugli; Sodikov, Jasur Bakhtiyor ugli

Annotation: The scour process in channels composed of cohesive and non-cohesive soils remains one of the least investigated and most complex problems in the dynamics of open-channel flows. The difficulty of studying and accurately describing this phenomenon is primarily related to the significant variability of the physicomechanical properties of cohesive soils. Unlike non-cohesive materials, cohesive soils exhibit complex structural, strength, and deformation characteristics, which considerably affect their resistance to erosion and the development of scour. In addition, the theoretical description of the scour process requires consideration of numerous interacting hydraulic and soil-mechanical factors, making the development of reliable mathematical models particularly challenging. Experimental investigations are also complicated by the heterogeneous structure of cohesive soils and the difficulty of reproducing their natural conditions in laboratory environments. The problem becomes considerably more complicated when scour of cohesive soil is investigated downstream of a hydraulic jump in the lower pool of hydraulic structures. In this region, the flow is characterized by intense turbulence, significant fluctuations in velocity and pressure, and the formation of large-scale vortical structures. Such conditions create a complex macroturbulent flow zone in which erosion and sediment transport processes interact dynamically. Therefore, a comprehensive investigation of cohesive-soil scour in this zone requires combined theoretical and experimental approaches to establish the main governing relationships and improve the accuracy of hydraulic calculations.

Keywords: Longitudinal velocity pulsations, local scour zone, lower pool, cohesive and non-cohesive soils.

Pages in journal: 351 - 359