Data Slow Run
Surface Velocity
Cork travelled 305cm in 15.9sec, 13.7sec, 12.0sec, 10.1sec and 11.5sec. It was done 5 times. Average them.
Velocity at Depth
Distance from Bottom (cm) Counts/30sec
5 130
6 160
7 186
8 173
9 175
10 183
11 189
12 184
13 187
Water Density = 1g/cm3
Water Viscosity Depends on Temperature, which = 20°C
Slope of the water’s surface = 0.4cm over 300cm
Width of the Flume = 48cm
Earth’s Gravity = 981g/sec2
Density of the sand = 2.6g/cm3
Size of the sand = 0.031cm
The 0.031cm sand starts to move at 25cm/sec
The bedform was ripples
Average Depth = 17.7cm
Data Fast Run
Surface Velocity
The cork travelled 203cm in 3.53sec, 3.80sec, 3.88sec, 3.88sec and 3.66sec
Velocity at Depth
The depth was too shallow and a velocity profile could not be constructed. Use the velocity of 285 turns/30sec as the average velocity for the flow meter.
All other variables the same as the slow run except:
Slope of the water’s surface = 4cm over 300cm
A 5.2cm cobble started to move at 54cm/sec
The bedform was dunes
Average Depth = 6.5cm