Figure 2. Longitudinal profiles of (thick lines) and (thin lines) for downstream (left) and upstream (right) waves built for various distances across the channel.

The stream direction is from left to right. In left panels, the distance across the channel is measured from the channel axis: (b) 0, (c) 3.4, and (d) 6.8. In right panels, the distance is measured from the channel wall: (f) 0, (g) 3.4, and (h) 6.8. For comparison, profiles of a flat waves moving from left to right (a) and from right to left (e) are shown. In calculations, , , , ; .