The assessment of power influence of discharge flow from surges under conditions of hydrologically hazardous natural phenomena

Abstract

Introduction. The analysis of studies on waves of translation and their dynamic effects on water infrastructure facilities indicates the incompleteness of accounting the dispersion component of wave motions in discharge flows. Existing analysis methods for the surge parameters with the dependence of the propagation velocity and wave pressure on the wavelength should be only considered as a rough approximation of the role of dispersion processes accompanying the surge propagation in river flows. The purpose of the research is to increase the accuracy of reliability analyses for equipment and auxiliary mechanisms of hydraulic structures and water facilities in the context of the growth of hydrologically hazardous natural phenomena in the form of surges. Materials and methods. The article used an analytical method for calculating the wave motion parameters. It is based on determining the conditions for synchronism of jumps and discontinuities in the parameters of the medium state when passing through front surfaces. An option was suggested for using the frontal characteristics method for integrating equations of unsteady currents in open flows. The paper presented a scheme for solving the differential equations of unsteady motions and continuity of flows in river streams with surges in the presence of resistance forces. Results. Analytical design relations were obtained for the velocity and power effects of surges with dispersion dependence on wavelength. An analysis of the obtained solutions is carried out by illustrating the dynamic effects of wave dispersion on water infrastructure facilities. Conclusions. The suggested method of the more accurate analysis for the force impact of the discharge flow from surges on the structural elements of hydro-economic and water-transport facilities can be used to determine the reliability of hydraulic structures and water-transport facilities. The obtained analysis relations for determining the kinematic and dynamic characteristics of the dispersion of the surges are advisably recommended to supplement the existing regulatory documents on hydraulic engineering.