FlowTracker Calibrations (In-House)

Untitled Forums International Hydrometry Network Flow Measurements ADCP FlowTracker Calibrations (In-House)

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  • #764
    AvatarEoin Wynne
    Participant

      Hi all,

      Aside from comparing Flowtrackers for complete Q measurements in the field,  I’m wondering if any agencies run in-house comparisons of Flowtracker velocity readings at a fixed point in flumes, tow tanks or some other type of controlled channels? If so we’d be keen to hear your setup and approach to this.

      Thanks

      Eoin, OPW Ireland

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      • #765

        Hey Eoin, we at SMHI have done this in the field as a comparison. All FlowTrackers at the same time, last year 2023. Once back in 2013, I drove all of them in a boat on a lake and compared the velocities. I rigged them up in a ladder.

        Please also try the new forum at https://forum.internationalhydrometrygroup.org/

        if it doesn’t work try http instead of https

        http://forum.internationalhydrometrygroup.org/

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        • #768
          AvatarEoin Wynne
          Participant

            Hi Daniel,

            I’ve been unable to log in to the new forum but will email you separately about that.

            Thanks for the reply. That’s great information – was your 2013 test using the boat successful? That is somthing practical we could try.

            Eoin

        • #769

          The FlowTracker part of the test was not too bad. For ADCPs I prefer beam alignment test (distance made good tests).

          We had five FTs mounted with wading rods on a ladder. The boat speed was stable using an electric engine with fixed speed posistions. To compare the velocities we drove straight for 300s four times at different speeds.

          Compared velocity magnitude since all FTs can’t be oriented perfectly. Vel_magnitude = sqrt ( vel_x^2 + vel_y ^2)

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          • #774
            AvatarEoin Wynne
            Participant

              Thanks so much Daniel – that’s great info. Much appreciated

              • This reply was modified 1 week, 2 days ago by AvatarEoin Wynne.
          • #771

            some pictures

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          • #776

            The USGS has a policy where every FlowTracker is tested in a flume at the Hydrologic Instrumentation Facility when purchased, returned from repair, and at least once every 3 years.

             

            Dave

             

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