A real life problem, just for fun

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SUMMARY

The discussion revolves around a phenomenon observed in an "ant channel" with a square cross-section of 20 cm x 20 cm, where surface water movement was noted at a velocity of 3 cm/s. Observers identified a distinct interface between moving and still water, which moved at half the velocity of the surface flow, indicating a discontinuity in water flow. The phenomenon suggests a change in water depth as a potential explanation for the observed behavior.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Knowledge of surface tension effects in water
  • Familiarity with flow discontinuities
  • Basic observational skills in fluid behavior
NEXT STEPS
  • Research fluid dynamics and flow discontinuities
  • Study surface tension and its effects on water movement
  • Explore methods for measuring water flow velocity
  • Investigate the impact of water depth changes on flow behavior
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Students of physics, fluid dynamics researchers, and anyone interested in the behavior of water flow and surface phenomena.

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Homework Statement



Around one of our buildings we have an "ant channel" of roughly square cross section (say 20 cm x 20 cm) with fish in it to control the mosquito larvae. The surface of the water carries particles giving a good indication of any surface movement.

Late one afternoon we observed the surface moving relatively quickly (say 3 cm/s). Suspecting a leak we followed the moving surface water and were amazed to find that the moving surface gave way abruptly to a still surface. Watching a little longer we observed that the interface between moving and still areas of the surface was itself moving -- at about half the velocity of the moving surface.

It appeared as if there was a discontinuity in the flow of water.

Homework Equations



None.

The Attempt at a Solution



I think I can explain the phenomenon. If no one gets it, I'll give clues.
 
Physics news on Phys.org
Hm. I'm not sure. But can I hazard a guess? There's a change in the depth of the water?
 

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