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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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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Gradually Varying Flow01:29

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Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
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Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and...
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Weir01:24

Weir

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A weir is a hydraulic structure designed to partially obstruct an open channel, enabling precise control and measurement of water flow. By forcing water to flow over or through it, a weir allows for accurate determination of discharge rates, making it an essential tool in water resource management. These structures are extensively used in regulating river flows, irrigation systems, and flood control channels.Types of Weirs and Their FeaturesWeirs are categorized primarily into sharp-crested and...
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Hydraulic Jump01:29

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A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
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Related Experiment Video

Updated: Apr 6, 2026

Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation
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Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation

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Exceptional river gorge formation from unexceptional floods.

L Anton1, A E Mather2, M Stokes2

  • 1Departamento de Ciencias Analíticas, Facultad de Ciencias, Universidad Nacional de Educación a Distancia (UNED), Senda del Rey 9, Madrid 20840, Spain.

Nature Communications
|August 6, 2015
PubMed
Summary

Bedrock river incision and gorge formation can occur rapidly, even in strong granite, driven by bedrock structure like faults and joints, not just flood size. This fluvial erosion process is key to understanding landscape evolution.

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Area of Science:

  • Geomorphology
  • River dynamics
  • Landscape evolution

Background:

  • Understanding bedrock river incision and knickpoint retreat is crucial for predicting landscape responses to environmental changes.
  • Sparse field data currently limits our knowledge of these geomorphic processes.

Purpose of the Study:

  • To investigate the rates and mechanisms of rapid gorge formation and bedrock erosion.
  • To analyze the controlling factors of erosion in a newly formed bedrock channel.

Main Methods:

  • Utilized eyewitness accounts and quantitative surveys of a rock-cut dam spillway experiencing overtopping floods.
  • Analyzed erosion rates, including headward retreat, incision, and widening over a six-year period.

Main Results:

  • Observed rapid amphitheatre-headed gorge formation in unweathered granite.
  • Erosion rates showed no correlation with flood magnitude or bedload availability.
  • Bedrock structural patterns (faults and joints) were identified as the primary drivers of erosion, primarily through fluvial plucking and block toppling.

Conclusions:

  • Extremely rapid transient bedrock erosion is possible even in mechanically strong rocks and moderate flood discharges.
  • Bedrock discontinuities significantly control landscape change and facilitate rapid gorge formation and knickpoint retreat.
  • Findings challenge existing models by highlighting the dominant role of structural geology in rapid bedrock erosion.