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Related Concept Videos

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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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To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
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A hydrodynamically active flipper-stroke in humpback whales.

Paolo S Segre1, S Mduduzi Seakamela2, Michael A Meÿer2

  • 1Department of Biology, Hopkins Marine Station, Stanford University, Pacific Grove, CA, USA.

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Summary
This summary is machine-generated.

Humpback whales use their large flippers for more than just steering. New research shows these flippers generate lift and thrust during lunge feeding, enhancing prey capture.

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Area of Science:

  • Marine Biology
  • Biomechanics
  • Animal Locomotion

Background:

  • Cetacean locomotion traditionally attributes swimming propulsion to fluke strokes and maneuverability to flipper-generated lift and torque.
  • Humpback whales (Megaptera novaeangliae) possess unusually large flippers, suggesting specialized hydrodynamic functions.
  • Previous hypotheses proposed flipper movements aid in prey corralling or counteracting feeding-induced torques.

Discussion:

  • This study reveals a novel function for humpback whale flipper movements during lunge feeding.
  • Rapid flipper flapping generates a complex, hydrodynamically active stroke.
  • This stroke produces lift and propulsive thrust, contributing to forward momentum.

Key Insights:

  • Humpback whale flipper strokes generate significant forward-oriented forces during lunge feeding.
  • This propulsive force enhances the efficiency of prey capture in dense aggregations.
  • This represents the first documented instance of a lift-generating flipper stroke for propulsion in cetaceans.

Outlook:

  • The findings provide an additional functional explanation for the unique morphology of humpback whale flippers.
  • Further research can explore the energetic costs and benefits of this propulsive flipper stroke.
  • Comparative studies may reveal similar behaviors in other cetacean species with large flippers.