River flow rate measurement (Seine – Troyes area)
BACKGROUND
The Grand Troyes water board continually monitors the Seine level. This board is in change of monitoring and anticipating high water levels in the Seine and protecting against any floods. It uses various measurement points situated in the greater Troyes area.
DESCRIPTION OF THE APPLICATION
The application that interests us is situated on the part of the Seine that passes through Troyes, just below a bridge. It measures flow rate using six measurement chords (i.e. 12 probes) and a converter. The distance between probes is around 15m while the distance between the banks is up to 12m. The bridge has three pillars, with two measurement chords on each (i.e. four probes/pillar).
EQUIPMENT USED
| FLOW METER | |
| Uf 831 CO multichord converter | SM 1684 wetted probes |
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| This converter can be used to take reliable and precise measurements of any type of free surface flow. | Six pairs of probes are used to improve precision via six measurement chords. This corresponds to four probes per bridge pillar. |
RESULTS
Measurement uncertainty is around 5%.
ADVANTAGES
- Continuous measurements,
- Dynamic measurements,
- Repeatability,
- Multi-channel and multi-chord measurements (the sum of the flow rates generates the total flow rate),
- Precision over the range of the flow (from low to high water levels).
