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Movies of inertial wave observations:

Inertial waves observed in a small, (100x80x80)cm tank in Grenoble, revealed oscillatory inertial wave current patterns in a vertical cross-section. The magnitude of the in-plane, 2D velocity vector (which is a projection of the true 3D velocity vector) is shown here. It is interesting to watch the observed phase propagation. Notice that the sloping wall in the experiment is at the right hand side and that phase propagates either into that wall (and lower right hand corner), or into the opposite (upper left hand) corner. Phase propagation appears to start at the other two corners. This is consistent with a clockwise energy propagation around the attractor. Observations were done under the same conditions in vertical planes (as above), and horizontal planes. Combining the information, 3D hodographs can be constructed on the line of intersection (see red line); or one can simply display the time dependent behaviour of the 3D velocity vectors.   These movies were made by M.Sc. student Niels Pörtzgen.