Qliner
Qliner in a combined discharge measurement in the Rhine
May 2004
The river Rhine is the largest river in Europe. The German national water authorities ( the Bundesanstalt für Gewässerkunde Koblenz) organised a discharge measurement in October 2004 in with 25 participants. 23 systems were so-called moving boat Doppler instruments. The Qliner was operated from a ship which moved from position to position, Fig 1. Reference measurements were made with two Ott-propellor current meters from the same ship.
The Qliner is owned and operated by Flannders Hydraulics laboratory:
Hydrologisch Informatiecentrum (HIC) Waterbouwkundig Laboratorium en Hydrologisch Onderzoek - Flanders Hydraulics http://www.lin.vlaanderen.be/awz/waterstanden/hydra
http://watlab.lin.vlaanderen.be
Fig 1: Survey ship "Walter Türk" from the German water authorities WSA Bingen with the Qliner in operation behind the ship and the propeller ready for deployment in front of the ship. (foto Rijkswaterstaat dir. Limburg)
In general results were good, Tabel 1. |
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Instrument
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Nr of
measurements
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Discharge
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Discharge
Standard
deviation
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Propellor
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Moving Boat
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1067 m3/s
Range 1026 – 1124
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Doppler (24)
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-
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| Qliner |
1
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1057 m3/s
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Qliner discharge standard deviation is computed on a single measurement and is based on the actually observed variations in measured water velocity. All results are described in detail by the Bundeslanstalt fuer Gewasserkunde in Koblenz Germany, www.bafg.de, in report number BFG-1437.
Moving Boat Doppler discharge standard deviation is based on 24 individual measurements on separate ships.
We are happy that the Qliner proved to be a good tool for discharge measurements in such a big river. We hope to show data from a measurement at the same location but then from a bridge.
We thank the people of Flanders Hydraulics for participating in this campaign.
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