Abstract
Continuous measurement of flow velocity was successfully carried out at the Qiantang River estuary in China using Fluvial Acoustic Tomography System (FATS), which was comprised of a couple of 7 kHz broadband omni-directional transducers. The tidal bore in the Qiantang River estuary is one of the most spectacular bores in the world. The river width and the mean depth at the experimental site, which was located around 90 km upstream from the mouth in the Hangzhou Bay, were 1200 m and around 5.5 m, respectively. The reciprocal sound transmissions were performed between the two acoustic stations located diagonally on both sides of the river; the horizontal distance between the acoustic stations was 3050 m. Heights and celerities of tidal bores were deduced from the cross-sectional average velocity v collected by the FATS. The bore heights deduced from v were comparable to those estimated from water levels near the river banks. Also, the bore celerities deduced from v were in good agreement with those estimated from the water levels.
