Turbulence and drag in a high Reynolds number tidal passage targetted for in-stream tidal power

摘要

Results are presented from an investigation of turbulence and bottom drag carried out in Grand Passage, lower Bay of Fundy. Flow measurements were made using a broadband 600 kHz acoustic Doppler current profiler (ADCP) sampling at nearly 2 Hz, and two single-point sensors: an acoustic Doppler velocimeter (ADV) sampling at 1 Hz, and a time-of-flight velocity sensor (MAVS) sampling at 12 Hz. All instruments were bottom-mounted. The maximum depth-averaged tidal current speed was 1.6 m/s. The local bathymetry was characterized by 20 m mean water depth and ca. 0.5 m high, 8 m wavelength dunes. The ADCP was deployed to one side of the dune field; the single-point sensor platform was within the dune field.