I like that a single ACM is able to obtain current measurements from an entire plane (typically the horizontal plane) with little flow distortion. It would take several directionally-distributed acoustic Doppler velocimeters to do the same. In Doppler profilers (like the Aquadopp or ADCP), the spatial separation between the sampling volumes for each transducer can be a bit bothersome if you're interested in the dynamics of smaller-scale motions.

With all of that having been said, it really depends on the application. What is yours?

Dear Nathan,

Thanks for your reply. In fact I just need the best possible estimation of the horizontal current at a fixed point. Current speed module and direction in N-S, E-W coordinates, that's all. My interest is to obtain time series of the current itself at the depth of deployment of the meter, and also to compute (horizontal) suspended sediment flux by means of a coupled turbidimeter.

Best regards, Jacobo