Abstract
Flood discharge and sediment transport are closely linked to channel resistance in steep mountain streams. Previous research has mainly focused on the resistance of fixed-bed channels with steep gradients and mobile-bed channels in alluvial rivers. The present study performs an experiment and establishes a calculation method for the fixed-bed resistance of mountain channels. The basic expression of the mobile-bed resistance of steep mountain channels is derived by determining the controlling factors of the bed load movement on the riverbed resistance. The proposed formula can accurately predict the variation of the bed load resistance. The results of the present research improve the understanding of fluid dynamics and sediment transport in steep mountain channels.
Highlights
Flood discharge and sediment transport are closely linked to channel resistance in steep mountain streams
Gao [18] believed that the transport concentration, relative roughness, and dimensionless particle size are the resistance affecting factors of the bed. They used the flume test and experiment data to establish an expression for the resistance of the bed load movement, based on dimensionless analysis [14]: h −0.75 fb = 0.048Cv 0.25 d∗ 0.5 ( )
The present work carries out the flume experiment to analyze the variation of the resistance of the mobile bed in steep gradient channels
Summary
The bed resistance of rivers is an important basis for flood control and engineering design. Gao [18] believed that the transport concentration, relative roughness, and dimensionless particle size are the resistance affecting factors of the bed They used the flume test and experiment data to establish an expression for the resistance of the bed load movement, based on dimensionless analysis [14]:. Researchers have conducted a mobile bed experiment [14] They considered the dimensionless particle size and sediment transport concentration as the influence factors and derived the following expressions for the flow resistance under the condition of bed load movement: p. Most of the experiments in the field of large-scale river channel mobile bed resistance were performed to study the resistance characteristics of water flow with sediment through the destruction of the bed surface. The present work carries out the flume experiment to analyze the variation of the resistance of the mobile bed in steep gradient channels
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