Introduction. When drawing up the feasibility study of the design and estimate documentation for the repair of the bridge over the river Kunka at section of the highway M-12 Stryi – Ternopil – Kropyvnytskyi – Znamenka (through Vinnytsia) due to the proximity of a number of reservoirs, which are formed by dam structures with an increased head and a high probability of damage to the bridge from the formation and passage of the breakthrough wave, there was a problem of development of safety measures for crossing the bridge.
Hydrodynamic hazards of impaired hydraulic structures for the road and bridge section may be due to the location of the infrastructure object in the lower beef of the dam, where both natural and man-made and other factors may cause such events as, for example, a catastrophic flood or the dam destruction by reducing its strength.
Problem statement. The analysis of information sources regarding the calculation of the breakthrough wave parameters showed that the technique is not well developed and is determined by engineering formulas.
Purpose. To perform mathematical modeling of the dam breakthrough parameters, to analyze its impact on the design of the bridge and to develop recommendations for protective measures.
Methods of research. Mathematical modeling with using continuity and fluid equations; mass, momentum and energy conservation equations.
Results. The results of the calculations show that the transition point in the lower beef should be positioned more than 20*Нп from the dam (the Нп breakthrough wavelength can be up to 9 m).
The cascading arrangement of several reservoirs requires the calculation, taking into account the possibility of sequential breaking of several dams, which was carried out on the basis of the created mathematical model.
According to the regulations and model calculations, the possibility offormation of a breakthrough wave requires the transfer of the highway at least 200 m from the dam.
Conclusion. Based on the calculations and analysis of the kinematics and morphodynamics of flows in the design of the designed bridge at the stage of repair, recommendations on the necessary layout and design protective measures are developed.
