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Rapidly Varying Flow01:24

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Gradually Varying Flow01:29

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Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation
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Flow in bedrock canyons.

Jeremy G Venditti1, Colin D Rennie2, James Bomhof2

  • 1Department of Geography, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.

Nature
|September 26, 2014
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Summary
This summary is machine-generated.

River bedrock erosion shapes mountains. New Fraser Canyon data reveal complex 3D flow structures, including velocity inversions and counter-rotating flows, crucial for understanding landscape evolution and improving erosion models.

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Area of Science:

  • Geomorphology
  • River dynamics
  • Landscape evolution

Background:

  • Bedrock erosion by rivers is a key driver of landscape evolution and mountain formation.
  • Existing models of bedrock incision often lack robust fluid flow components due to limited observational data.
  • Understanding fluid flow in bedrock canyons is essential for accurate landscape evolution models.

Purpose of the Study:

  • To investigate the three-dimensional fluid flow structure within bedrock canyons.
  • To provide empirical data to test and improve existing models of bedrock erosion.
  • To understand how flow dynamics influence canyon morphology and landscape evolution.

Main Methods:

  • Conducted a 524-km continuous acoustic Doppler current profiler survey along the Fraser River's centerline.
  • Collected data across 42 individual bedrock canyons.
  • Analyzed three-dimensional flow structures, including velocity profiles and coherent flow patterns.

Main Results:

  • Observed a high-velocity core at the bed surface upon entering canyons, causing a velocity inversion.
  • Identified plunging water upwelling along canyon walls, creating counter-rotating, along-stream coherent flow structures.
  • Demonstrated that these flow structures promote deep scour and wall undercutting, leading to channel widening and near-vertical walls.

Conclusions:

  • The three-dimensional flow structure in bedrock canyons is more complex than previously modeled.
  • Current fluid flow models for bedrock erosion require refinement to incorporate these observed complexities.
  • Developing computationally tractable models that capture these flow dynamics is crucial for understanding bedrock erosion and its coupling with solid-Earth dynamics.