Purpose: to determine dependencies for defining the roughness coefficient and the Chezy velocity parameter, recommended for using in the hydraulic calculation of fish passage and spawning channels.
Materials and methods. The empirical basis of study was the materials of a study on the physical hydrometric model of flow characteristics flowing along the fish passage and spawning channels beds. When conducting the study, well-known methods for measuring hydrometric parameters on hydraulic structures models were used.
Results. The studies were carried out on a hydraulic model of the canal section, which is a rectilinear tray of trapezoidal cross-section with a working length of 6.0 m, a width of 1.2 m along the bottom and a depth of 0.3 m with a slope ratio of 1:2.5. The scaled parameters of the water flow in the model correspond to their values for fish passage and spawning channels installed as a part of river low-pressure hydraulic structures. The bed of the channel model provided for the possibility of changing the roughness of its covering and installing cuboid-shaped elements of enhanced roughness, placed along the channel bottom in a checkerboard pattern. The ratio of the flow geometric parameters (width and depth), the size of the roughness protrusions of the covering of the slopes and the bottom, elements of enhanced roughness, and its hydrometric characteristics correspond to the ranges recommended for fish passage and spawning channels. It is shown that the specificity of the design solutions of channel tracts and the parameters of the flows flowing along their beds does not allow the use of the known recommendations for determining roughness coefficients and Chezy parameters; this predetermined the need to establish new design dependencies corresponding to the flow design dependences.
Conclusion. Calculation dependencies for determining the roughness coefficient and the Chezy parameter, corresponding to the conditions of design and operation of fish passage and spawning channels equipped with elements of enhanced roughness have been established.
fish passage and spawning channels, hydraulic calculation of channels, channel roughness coefficients, Chezy parameter, channel hydrometry
Shkura V. N., Shevchenko A. V. On roughness coefficient and Chezy parameter for hydraulic calculation of fish passage and spawning channels. Ways of Increasing the Efficiency of Irrigated Agriculture. 2024;92(1):226–245. (In Russ.).
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