Abstract
The resistance to a flow in open channels of river type depends on a variety of parameters. The coefficient of bottom roughness is an integral quantity accounting for the geometric and physical features of the river bottom. Definition of the channel cross-section variability contribution to the roughness coefficient is the aim of our research. We have applied the 2D numerical model of surface water dynamics in the shallow water approximation to our task. The Manning roughness coefficient for non-prismatic open channels has been estimated depending on the parameters of the variable cross-section of the water flow in the range n = 0 ÷ 0.02.
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