At 1:02 the first meander cutoff occurs with extensive headcutting afterward as the channel tries to lower its gradient. The headcutting is visible as an advancing white line. At 1:39 I excavate halfway thru the area of the next meander cutoff, which finally occurs at 2:18. Tremendous amounts of sediment are eroded/transported after each meander cutoff. This 3 min video represents 90 min of real time. The hybrid sand (mixture of white plastic sand and dark mineral sand) makes erosion, transport, and deposition easier to see.