Author(s): E. C. Jamieson; C. D. Rennie; R. B. Jacobson

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Abstract: Detailed mapping of bathymetry, velocity and bed load velocity using a boat mounted acoustic Doppler current profiler (ADCP) was carried out in the vicinity of a submerged wing dike located in the Lower Missouri River near Columbia, Missouri. At high spring flows the wing dikes become submerged, creating a unique combination of vertical flow separation and overtopping (plunging) flow conditions, causing large scale three-dimensional turbulent structures to form. Over a period of one day, sampling transects at 5 and 20 m spacing were completed along a 388 m section of the Missouri River, covering the area adjacent to and upstream and downstream of a single wing dike. For each transect measurement, bed load velocity was estimated using ADCP bottom tracking data and high precision real-time kinematic global positioning system (RTK GPS). The principle objective of this research is to identify the measurement limits of an ADCP in a complex, threedimensional (3-D) flow. Results indicate that spatially dense single transect measurements were capable of (1) producing detailed bed velocity maps that correspond closely with large scale dunes in the thalweg and (2) generating interpolated 3-D flow fields used to identify the flow separation and plunging action at the wing dike tip, including vertically orientated vortex cores.

DOI:

Year: 2009