Purpose: to compare the roughness coefficients of protective coatings of the river bed filled with crushed stone with and without binder.
Materials and methods. The study was carried out on an experimental facility with a trapezoidal cross-section of a flume with a vertical right (m = 0), inclined left (m = 1) slopes, with a variable bottom slope i = 0.001...0.0237, the total length of the covered section is 8 m. The length of the working section was 4.9 m, the experiments were carried out when the flow rate at the facility varied from 43 to 166 l/s. Flow parameters were measured for two coatings at five measuring sections. Velocity measurements were carried out on 11 verticals, equidistant from each other and from the right wall of the flume. Velocities were measured at each vertical at six points along the height using a Pitot tube with a diameter of 2 mm. For the composite coatings under study, the roughness coefficient was estimated using the Manning, Gangillier – Kutter and N. N. Pavlovsky dependencies.
Results. The calculation formulas and the results obtained were analyzed. The average value of the roughness coefficient for two coatings is derived. The coating with a bitumen-polymer binder has a lower roughness coefficient, this is due to the smoother structure of the top layer of the coating in contact with the water flow.
Conclusions. Experimental studies carried out for two coatings filled with crushed stone with and without binder showed the possibility of using innovative fastening in practice. For the coatings under study, it can be recommended to use: with a coating filled with crushed stone with a bitumen-polymer binder, the coefficient value n = 0.0175, and with a coating filled with crushed stone without binder, the value n = 0.0237 (they were obtained using the Manning formula). Thanks to the obtained values of the roughness coefficients, when using both coatings in practice, it is possible to select the type of coating more correctly that corresponds to the designed characteristics of the channel or structure.
bank strengthening, anti-erosion coating, geomat, crushed stone, bitum, water erosion, roughness coefficient, slope
Zhukova T. Yu., Eremeev A. V., Alekseev D. A. Comparison of the hydraulic characteristics of geomats filled with crushed stone with and without binder filler. Ways of Increasing the Efficiency of Irrigated Agriculture. 2024;93(2):31–43. (In Russ.).
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