Calculation of the roughness of the Sheshupe riverbed according to hydrological yearbooks

When conducting engineering hydrometeorological surveys, hydrological and hydraulic calculations are performed, in which an indicator characterizing the resistance of the channel to flow is taken into account. The integral characteristic of the hydraulic resistance of river channels is the roughness coefficient. In accordance with regulatory documents, the values of the roughness of the channel of the water body and the floodplain are taken according to the qualitative characteristics of the channel, which is subjective and can lead to significant errors in the calculations. The use in calculations of the roughness coefficient obtained as a result of single field measurements is inappropriate, since it can change throughout the year. This paper presents the results of studying the roughness of the Sheshupe river bed in different seasons of the year, and establishes the dependence of the roughness coefficient on dimensionless complexes (Froude and Reynolds numbers). The published data of measurements on the Sheshupe River (hydrological post in the village of Dolgoe) were used for the calculations.