Stream Table – 3.4 – Group 2

We did not have to start over on the stream table!  We dredged the white sand that had dumped on the table out of the stream, and removed it from the table.  The stream appears to have continued to meander, and has found its way to the cut banks again.

The black spot in at the head of the table is the plastic

 bottom of the table.  It is also where the water is 

being dribbled on the table.

The white sand is what is being deposited. 
The cut banks are brown/rocky cuts in the white sand.

A new sediment shaker has been designed, and is being implemented in this version.  The last sediment shaker had good concepts, but it was not consistent in its deposition of sediment, we would often walk in to observe it and no sediment would be coming out of the pinch point.  The new sediment shaker uses the angle of repose to control the amount of sediment being fed into the stream instead of a pinch point.

The red cup holds the sand and has a straight, stiff tube 

epoxied to the bottom.  The silver thing strapped on to the cup 

via the black band is a motor with a spinning fan at the 

bottom to shake the cup. There are springs on the three 

posts that also allow the cup to shake.

The delta has migrated channels over the last day:

Yesterday:

In this picture the main channel is flowing toward the 

bottom-right-hand corner of the photo (north-west).

 Today:

In this picture the main channel is flowing toward the
top-right-hand corner of the photo (south-west).