Shallow, narrow and busy channels do not easily allow conventional current measurements in real time. The goal is to investigate the possibility of using data of a horizontally mounted ADCP for measuring flow velocity and direction in a river or channel. Measurements were in the Port of Rotterdam. Two horizontal acoustic beams point fiam one shore to the &er. During WO tidal cycle s h u l m m w were carried with a vessel mounted vertical ADCP on three transects. performed during one month with a horizontally mounted ADCP in a 400m wide waterway in the Port of Rotterdam. Two horizontal acoustic beams point from one shore to the other. We compare the horizontal ADCP data with the data of a vessel mounted ADCP. It has been shown that the horizontal ADCP averages flow over a certain part of the water column.We propose a method to compute river flow averaged over the total cross section from horizontal ADCP data. The horizontal ADCP results compare well with vessel mounted ADCP data for two tidal cycles.
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