The third experimental run was started on September 25, 2014 and concluded on September 26th. The initial channel was 25 cm wide by 3 cm deep. Sediment was collected at 15 minute intervals throughout the experiment.
The flume was first run at a low flow of 0.17 L/s for 45 minutes, during which there was very little sediment output and little to no morphologic change. The flow was then increased to 0.27 L/s. A bed scan was taken (while the flume was still running) after an hour at this flow….
The second experimental run was conducted by Lucy MacKenzie on September 19th, 2014. The initial channel template was 25 cm wide by 2 cm deep.
The flume was first run with at a low flow of 0.3 L/s for approximately 3 hours during which little morphologic change occurred and sediment transport remained low. Discharge was then raised to 1 L/s for approximately 45 min. Degradation and little lateral erosion occurred in the top couple meters of the flume while massive widening occurred in the lower portion (as seen in the video).
[This video was created from a set of time lapse photos taken on a GoPro Hero 3. This video represents a period of approximately 45 min.]
The first experimental run was conducted on September 17th by Lucy MacKenzie. The flume was run for a total of 4 hours. The channel template used in this trial run was 50 cm wide by 3 cm deep.
The flume was first run for three hours under low flow (0.3 L/s) in order to condition the bed. There was very little morphologic change during this period and little sediment transport occurred. Following the conditioning of the bed, flow was increased to 1.3 L/s in order to simulate the occurrence of as large flood event. Bed morphology changed rapidly and sediment transport increased dramatically immediately following the increase in discharge. All sediment sizes, except the largest size class, were observed to be mobile during this magnitude of flow.
[This video was created from a sped-up video shot on a GoPro Hero 3 and represents a time period of approximately 14 min ]
[This video was created from time laspe images shot on a GoPro Hero 3 and represents a time period of approximately 41 min]
The transfer of sediment into the flume began on September 9, 2014. The sediment mixture was created from a range of different sand and gravel mixes acquired from Target Products. The filling of the flume was completed several days later on September 16th. The total mass of sediment put into the flume was approximated to be just under 4 tonnes.