River Geomorphology (7) - Emriver Channelization, Large Meanders, Packed Sediment

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http://emriver.com/documents/2018/01/...

This is a time-lapsed Emriver channelization demonstration in which a meander
loop is cut off. In this case the channel length between two points is more than
halved, so slope would increase by a factor of 2+. The playback speed varies
and is noted on the video.
Note the relative stability of the system before channelization, in which a small
amount of sediment is moving through the reach, but there is little bank erosion
and by one definition—sediment in = sediment out—the system is very stable. A
moving circle and the words “uniform bedload transport” illustrate this.
After the channelization note bank failures both up and downstream, and that the
channel slowly reestablishes a meandering form so that its overall length is about
the same as before the channelization. Graphics show how bedload transport
greatly increases due to incision and bank erosion upstream of and within the
reach.
During the remeandering process, note that there is a net export of sediment—
you can see this by visually comparing sediment movement into the reach versus
that out of it.
Near the end of the clip (2:17), transect graphics appear. These show the wide,
unstable nature of the channelized reach versus the narrow, more stable
upstream reach.

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