Turbidity Current Movie from Gary Parker, St. Anthony Falls Hydraulic Laboratory, University of Minnesota.
Series of turbidity currents, dyed red, white and green. The configuration of the basin is of a fill and spill geometry, where the turbidity current runs into a silled basin beyond which it overflows down into a lower basin floor. Only a few clips are shown.
0:00 – 0:36 – Far out in the basin a white turbidity flow has already taken place and some dilute suspension from that event is still settling. A second flow, dyed red, is just moving into view. In real time you can see the flow head billow up as it moves.
0:36 – 1:19 – A third flow, dyed white, is added to the tank. As it flows into the basin it displaces the turbid red water and a wave of thickened flow moves across the basin. As the flow approaches the sill, it punches through the red cloud of suspended material and crosses the sill (at 1:05). After topping the sill, the flow picks up inertia as it flows down the steeper slope. The flow head billows up as it entrains water during acceleration.
A fourth flow is added, dyed red, but not shown in the movie.
1:20 – 1:54 – A fifth flow, dyed dark green, enters the tank. It moves much like flow #3, however you can more clearly see it mix with the red turbid water of the preceding flow.
1:54 – 2:10 – A view farther down the basin as flow #5 moves across the frame.
File 31382 is a 14MB Quicktime MP4 Video
Uploaded: Jan20 12
Last Modified: 2012-01-20 14:12:07