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Parameters of the experiments
4.2.2 Measured parameters
4
5
6
3
7
8
9
10
2
1
1. Pump
2. Electromagnetic discharge meter
3. Sediment supply (volumetric meas.)
4. Measurement frame command
5. Water level and bed topography
measurement
6. Velocity measurement (UVP)
7. Armoring samples
8. Manual readings of water and bed
levels on side wall
9. Sediment samples at the outlet
10. Total weight of sediments
Figure 4.13: Scheme of the experimental setup with circulations
On the experimental setup (Fig. 4.13) the following parameters were measured (see also § 4.4):
• The water level was recorded with an ultrasonic gauge (5) (see § 4.4.3 and Appendix 2.1.1).
• The bed topography was measured with the same ultrasonic gauge (5) (§ 4.4.3 and
Appendix 2.1.1) at the end of the test once the channel emptied. The water was drained
from the channel smoothly to avoid any alteration of the bed topography.
• A manual reading on the side walls (8) allowed the description of the evolution of the water
and bed levels during the tests (every 30 or 60 min).
• The discharge was measured with an electromagnetic flow meter (2) which is part of the
fixed laboratory equipment (see § 4.4.5).
• The bed load was measured at the inlet (3) (introduced volume) and at the outlet (10)
(weight of the filtering basket). For most of the tests, sediment samples (9) were taken at a
regular interval (every 30 minutes) and weighted to allow the analysis of the evolution of the
bedload during the test.
• The velocities were measured with an Ultrasonic Velocity Profiler UVP (6) provided by
Metflow SA, Lausanne, which is based on the Doppler effect. The measurement device is
described in detail in paragraph 4.4.4 and in Appendix 2.1.2.
EPFL Ph.D thesis 2632 - Daniel S. Hersberger November 9, 2002 / page 79