ABSTRACT
In recent years, coastal acoustic tomography technology has been widely used for measuring the discharge of river channels and offshore harbors in the world. Compared with conventional measurement methods, it has the advantage of continuous measurements without interference from complex environments. In this experiment, three stations were set up on both sides of the riverbank near the Datong Hydrological Station for cumulative flow velocity monitoring of two survey lines. According to the principle of reciprocal propagation of acoustic signals, the flow velocity of the survey line is calculated, the flow velocity of the river is obtained by the method of reconstructing the vector based on projection, and the cross-sectional flow velocities were calculated according to the angular relationship between the river flow direction and the cross-section. The measured flow velocity of the river was around 1.5m/s during the experiment period, and the error of the cross-sectional discharge calculation was kept within 10% when compared with the data published by the Yangtze River Hydrographic Network. The results demonstrate that the new method is more effective than the method of inverting a single survey line and provides better guidance for application to subsequent river flow monitoring.
