NWDTW 2024

A review of the theory, setup, common issues, and best practices in the use of the azimuth method for Acoustic Doppler Current Meters (ADCPs) during Mid-Section Measurements. The mid-section method for discharge computations using ADCPs is a useful tool for collecting discharge measurements when moving boat measurements are not possible or are extremely poor due to issues with bottom tracking, moving bed, river traffic, cable-car measurements, and ice measurements, or as an option for check measurements. The Azimuth Method utilizes the ADCP’s internal compass and a fixed Tagline Azimuth to calculate flow during stationing. This talk discusses common issues associated with tagline azimuths, compass calibration best practices, and differences between Sontek and RDI software. With knowledge of best practices as well as common errors encountered while utilizing the azimuth method, mid-section measurements can be produced with greater confidence while minimizing measurement uncertainty.