Author(s): Kiyosi Kawanisi, Mohamad Basel Al Sawaf
Linked Author(s): Kiyoshi Kawanishi
Keywords: Streamflow, acoustic tomography, shallow flow, gravel-bed river, mountainous river
Abstract: This study demonstrates the fluvial acoustic tomography system (FATS), a promising approach for measuring streamflow with high sampling rate for a long period. Unlike traditional point/transect measurements of discharge, FATS enables measurements of the depth- and range-averaged flow velocity along the ray path in a fraction of a second. FATS with an automatic data transfer function and internet connection allows one to automatically obtain real-time flow data. Streamflow measurements were performed on November 26, 2015, in a shallow gravel-bed river (depth: 0. 8 m, width: 110 m under low-flow conditions). This paper presents a 258-day record of the flow. The mean water depth along the transmission line ranged from 0. 8 to 3. 7 m and the FATS streamflow estimate ranged from 15 to 580 m3/s during the observation period. The FATS record showed temporal discharge changes at multiple time scales ranging from a few tens of minutes to the order of days. The continuous FATS estimates indicated that the streamflow did not change smoothly with the river stage. Although the �true� value of streamflow is not known, 77% of the relative differences between FATS and RC estimates were within �10% under the flow condition
Year: 2017