Session 9: Doppler technology — Part II

Acoustic Doppler profilers have shown great usefulness in their ability to simultaneously measure currents at many distances away from the instrument simultaneously. This session includes four applications of acoustic Doppler profilers, three on moving vehicles, and one stationary mounting on pilings. Marsden et al. show the capability and some results of a phased array ADCP in a River Ray river discharge measuring system. The paper describes many of the modes of processing used to optimize the data measured. Rusello et al. show the results of mounting a Nortek Aquadopp pulse coherent high resolution profiler on a McLane Moored Profiler (MMP). The Aquadopp can directly measure the turbulent velocities as a function of wavenumber, in three directions, without resorting to Taylor´s frozen turbulence hypothesis. The paper has some analysis of the MMP motion and compares the Aquadopp measurements to acoustic travel time velocity measurements. Mullison et al. describe the results of mounting a Workhorse ADCP on a wave-powered surface AUV. The paper compares different motion and compass compensation schemes. Stamates describes some of the issues considered in mounting an ADCP on a piling to measure currents at different depths and distances across the Port Everglades Shipping Channel. Using sound-speed profiles from CTD casts from four different seasons; acoustic ray tracing was used to optimize the declination angle of the ADCP mount.