10. Moving-bed Test
The Moving-bed Test button opens a window that allows the user to review moving-bed test results, mark tests invalid, and decide if any of the moving-bed tests should be used to correct the measured discharge.

When the Moving-bed Test window is first opened, the first file automatically selected as the primary moving-bed test is the file displayed in the graphs at the bottom of the window. To display a different file, click in the table on the filename to be displayed. The filename of the moving-bed test displayed is shown immediately above the graphs. The graphs at the bottom change depending on whether the displayed test is a loop test or a stationary test.
Definition of Table Columns
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Filename—The filename containing the moving-bed test.
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Type—The type of test (Loop or Stationary). NOTE: The test automatically selected for determining if there is a moving-bed and/or correcting for it are in bold. For details see the section Automatic Test Selection.
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Duration—The duration of the test in seconds.
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Distance Upstream—The distance the test showed the boat moved upstream from its starting location. This distance is the closure error for a loop test.
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Moving-Bed Speed—The computed speed of the bed (Distance Upstream/Duration).
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Moving-Bed Direction—The direction (azimuth) the boat moved relative to its starting location. For a moving-bed condition, this value should be approximately 180 degrees from the flow direction. This value is only computed for the loop moving-bed test.
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Flow Speed—The magnitude of the average water velocity vector for all data in the test.
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Flow Direction—The direction (azimuth) of the average water velocity vector for all data in the test. This value is only computed for the loop moving-bed test.
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% Invalid BT—The percentage of ensembles that have invalid bottom track data.
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Compass Error—The difference in the flow direction between the outgoing and returning portions of the loop moving-bed test.
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% Moving Bed—The ratio of the moving-bed speed to flow speed expressed as a percentage.
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Moving Bed—Using the criteria for a moving-bed condition documented in Mueller and others (2013), QRev determines if a moving-bed condition exists. If the quality of the moving-bed test results in errors, this field is set to Unknown because the moving-bed test is unreliable.
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Quality—QRev completes a quality assessment of every moving-bed test. Based on criteria documented in Mueller (2016), the quality of the measurement is set to Good if all the quality checks pass, to Warnings if some quality checks fail but are not critical failures, or to Errors if critical errors in the moving-bed test are identified.
![]() Allows user to zoom, pan, and query the graphs. For more information see Toolbar.
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![]() Allows the user to add a comment. For more information see Comment Button.
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