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Incised river meanders: evolution in simulated bedrock.

R G Shepherd

    Science (New York, N.Y.)
    |October 27, 1972
    PubMed
    Summary
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    Stream incision in bedrock depends on sediment load. Full sediment load causes vertical erosion at bends, while partial load leads to lateral erosion, driven by helicoidal currents and shear stress.

    Area of Science:

    • Geomorphology
    • Fluid Dynamics
    • Sediment Transport

    Background:

    • Understanding river channel evolution is crucial for managing fluvial systems.
    • Bedrock stream incision is a key process shaping landscapes.

    Purpose of the Study:

    • To investigate the controlling factors of lateral and vertical stream incision in simulated bedrock.
    • To determine the influence of sediment load on erosion patterns at river bends.

    Main Methods:

    • Utilized a 60-foot (18.28-meter) experimental flume.
    • Simulated sinuous stream flow over bedrock.
    • Varied the entrained sediment load to observe incision responses.

    Main Results:

    • Vertical incision at bends occurred when 100% of the sediment load was entrained.

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  • Lateral erosion outward from bends occurred when less than 100% of the sediment load was entrained.
  • Helicoidal currents and localized shear stress were identified as key drivers of erosion and deposition patterns.

    • Conclusions:

    • Sediment transport capacity significantly dictates whether a stream incises vertically or laterally.
    • The dynamics of helicoidal flow and shear stress distribution are fundamental to bedrock river morphology.
    • Findings provide insights into the geomorphic processes governing bedrock river evolution.