Geostrophic adjustment — tank experiments
In the rotating tank, we will attempt to examine the geostrophic adjustment problem
by releasing a cylinder of fluid which is denser or lighter than its surroundings while the
tank is rotating. To set this up, you need to figure out what kind of density difference is
needed to make a deformation radius on the order of 10 cm. The fluid in the tank will be
about 10–20 cmdeep. Rotation rate is up to 10 rpm. How much salt to you need to add
per amount of water to get a reasonable g � ?
Things to do:
Estimate the slope of the interface you expect to see. Compare with observations.
Estimate the swirl speed.
When spun up,
remove can
vertically
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Sketch of apparatus
Add dyed, salty water
to level of
water outside
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