Halych O. Improvement of methods for calculating the parameters of undular jump with taking into account the energy losses and wave diminishing

Thesis shows improvement of methods for calculating the parameters and free-surface of the undular jump for the two ranges of Froude numbers – 1,0<Fr1<1,80 and Fr1≥1,80. As a result of theoretical and experimental studies, the method of calculating the parameters and free-surface profile of undular jump, which takes into account energy losses and waves diminishing for Froude more than 1,80, was improved. Based on full-scale investigation, it was made the recommendations for using the methods of calculating the free-surface profile of undular jump with taking into account the energy losses and wave diminishing along the length. From practical point of view it allows to determine the maximum and second conjugated depths and wavelengths of the undular jump. Mentioned positions and conclusions in the dissertation can be used in the design, construction, operation and reconstruction of hydraulic structures, within which a phenomenon of undular jump can be formed, which will increase their reliability.