EXPERIMENT 6

Incomplete Entry - needs to be finished.


Hypothesis

Decreasing the ratio of load to discharge will create a balance between erosion and deposition that will favor development of a meandering channel pattern, rather than construction of an alluvial fan.

Set Up

Bed fill:	Fine-grained (0.70 mesh) quartz sand
Bed thickness:	5 - 6 cm
Bed gradient:	0⁰
Base level:	11 cm below top of table side
Discharge rate:	45 mL/s (estimated)
Sediment feed rate:
Shape of initial channel:	Single bend followed by a straight channel (dimensions not recorded)
Depth of initial channel:	1 cm (estimated)
Width of initial channel:	3 cm (estimated)
Discharge stage:	Bankfull
Adjustments from Experiment 5:	· The sediment feed rate was decreased. · An attempt was made to better determine actual discharge rates (Table 1).
Procedure:	· Discharge and sediment feed were started and allowed to flow uninhibited for the duration of the experiment.

Table 1: To determine discharge rates, we filled a beaker from the discharge hose, taking measurements in ten second intervals and relate those to partial turns of the control knob. Turns of 1/4 and 3/4 of a rotation showed consistent results; however, 1/2 rotation turns showed a higher flow rate when turned down from a higher rates than when turned up from lower rates. For consistency, when we want to have the water at a 1/2 turn flow rate, we will turn the water off and make the half turn to keep the flow a constant rate of 45mL/sec.

                       


Observations

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Interpretations (Each interpretation is tied by number to an above observation.)

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Technical Issues