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Parameters of the experiments
.
Distance to outlet [m]
6
Jf = 0.70 %
5
4
3
2
1
0
0
Jf = 0.50 %
10
Jf = 0.35 %
Q=150 l/s, Jf=0.0035
Q=180 l/s, Jf=0.0035
Q=210 l/s, Jf=0.0035
Q=150 l/s, Jf=0.005
Q=180 l/s, Jf=0.005
Q=210 l/s, Jf=0.005
Q=150 l/s, Jf=0.007
Q=180 l/s, Jf=0.007
Q=210 l/s, Jf=0.007
end of the bend
Q = 150 l/s
Q = 180 l/s
Q = 210 l/s
end of the channel
20
30
40
50
Water level difference [mm]
Figure 4.14: Computed backwater curve in the outlet reach - difference between computed water level and normal
water depth
The bed load depends on the sediment supply, the transport capacity of the flow as well as on the
corresponding equilibrium conditions. The tests were carried out with constant discharge, in situation
of balance in the straight entry reach. Regarding duration, the tests were run until a global
dynamic equilibrium was obtained (equality between fed sediments and sediment quitting the
channel - in volume and grain size distribution - and stable bed levels along the outer side wall).
EPFL Ph.D thesis 2632 - Daniel S. Hersberger November 9, 2002 / page 81