Abstract
Bedrock erosion plays a critical role in mountain river channel evolution, especially, where there are hydro-projects with high velocity flow conditions. In this study, laboratory experiments are carried out to investigate strength and erosion mechanism of soft bedrock under high shear stresses by high velocity open channel flows. Prototype bedrock from the upper reaches of Yangtze River is employed as testing samples. New observed dataset is generated concerning the flow, bedrock strength and evolution of bedrock erosion, which can be exploited to evaluate bedrock erosion rate and test mathematical bedrock erosion models.
Highlights
Bedrock erosion processes are believed to play important roles in the evolution of mountain river channels and their associated hydro-projects
It is possible that hydraulic scour may dominate on one reach, whereas abrasive scour may dominate on another
Only the hydraulic processes are considered, and particular attention is paid to the bedrock erosion in the upper reaches of the Yangtze River
Summary
Bedrock erosion processes are believed to play important roles in the evolution of mountain river channels and their associated hydro-projects. The main mechanisms responsible for bedrock erosion including hydraulic scour (plucking of rock fragments by fluid shear stress or differential fluid pressure) and abrasive scour (interaction between rock and moving sediment particles) [7]. It is possible that hydraulic scour may dominate on one reach, whereas abrasive scour may dominate on another Both mechanisms may operate concurrently to erode the bedrock on some rivers. Only the hydraulic processes are considered, and particular attention is paid to the bedrock erosion in the upper reaches of the Yangtze River. A flume is purposely designed to generate high velocity open channel flow, and prototype bedrock including mud-rock and sand-rock from the upper reaches of Yangtze River are employed as testing samples. For each run, detailed measurements of the flow and bedrock erosion processes are conducted
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