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Description of the experimental setup
4.1.4 Outlet box with tilting gate and sediment sampling device
At the end of the channel, an outlet box was built assuming different functions (see Fig. 4.9):
• The control of the bed and water level at the outlet was ensured by a weir (1) between the
exit reach and the outlet box; the flow condition over the weir was critical.
• A smooth filling and emptying of the channel was enabled by a tilting gate (2) which was
completely lowered during the tests.
• The sediment sampling was performed by means of a big “L” covered with a fine grid
(1 mm openings). The sampling device (3) is articulated at the downstream end of the outlet
box. It can be operated with a crank lever.
• Finally, the water and the sediments were collected and lead to two outlet pipes (4).
Units in mm
2
3
1
4
4
4
2 1
1
2
4
4
1. Overfall, 2. Tilting gate, 3. Sediment sampling device, 4. Outlet pipes
(CENTER TOP: elevation, CENTER BOTTOM: situation,
LEFT: upstream-view, RIGHT: downstream-view)
Figure 4.9: Outlet box with tilting gate and sediment sampling device
EPFL Ph.D thesis 2632 - Daniel S. Hersberger November 9, 2002 / page 75