Comparison of Vertical Velocity Measurements in the Great Lakes Connecting Channels with Theoretical Profiles

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by Jan A. Derecki, Great Lakes Environmental Research, Lab, United States,
Frank H. Quinn, Great Lakes Environmental Research, Lab, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: Vertical distribution of velocities was measured with an upward looking acoustic Doppler current profiler in the upper St. Clair River during November 1984 - April 1986 and the Detroit River from November 1986. With water depth of about 14 m at both meter locations, the profiler provides 11 vertical velocity readings at 1 m increments between about 2.5 m above the bottom and about 0.5 m below the surface. The measured data are recorded at 15 min intervals, from which hourly and daily values are derived. These velocity vectors are later combined to produce vertical velocity profiles of the two rivers. The velocity data for shorter periods indicate somewhat larger scatter, but the vertical velocity profiles for all periods illustrate high consistency and verification of the theoretical, logarithmic vertical distribution of velocities.

Subject Headings: Velocity profile | Velocity distribution | Lakes | Comparative studies | Rivers and streams | Acoustic techniques | Doppler systems | Water meters | Great Lakes | Michigan | North America | United States | Detroit

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