QBO Observing reversing currents

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Water tank Almost same as in Plumb and McEwan's experiment.3) Walls: Acrylic pipes Height: 60cm Internal diameter: 40cm External diameter: 60cm A donut-shaped air chamber divided into 16 parts and covered with a rubber membrane was floated on the surface of the water. Working fluid Salt water used to form stratified layers.   Visualization Neutrally floating plastic beads were used.   Experimental process Air pistons were used to force air in and out of the air chambers to create an internal gravity wave and create a mean current.