|Water Science and Engineering 2010, 3(1) 47-55 DOI: 10.3882/j.issn.1674-2370.2010.01.005 ISSN: 1674-2370 CN: 32-1785/TV|
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New acoustic system for continuous measurement of river discharge and water temperature
Kiyosi KAWANISI*1, Arata KANEKO1, Shinya NIGO2, Mohammad SOLTANIASL3, Mahmoud F. MAGHREBI3
1. Graduate School of Engineering, Hiroshima University, 1-4-1, Kagamiyama,
Higashi-Hiroshima 739-8527, Japan
2. Ministry of Land, Infrastructure, Transport and Tourism, 2-4-36 Kitaku Sikadachou,
Okayama 700-0914, Japan
3. Civil Engineering Department, Ferdowsi University of Mashhad, P. O. Box 91775-1111, Mashhad, Iran
In many cases, river discharge is indirectly estimated from water level or streamflow velocity near the water surface. However, these methods have limited applicability. In this study, an innovative system, the fluvial acoustic tomography system (FATS), was used for continuous discharge measurement. Transducers with a central frequency of 30 kHz were installed diagonally across the river. The system’s significant functions include accurate measurement of the travel time of the transmission signal using a GPS clock and the attainment of a high signal-to-noise ratio as a result of modulation of the signal by the 10th order M-sequence. In addition, FATS is small and lightweight, and its power consumption is low. Operating in unsteady streamflow, FATS successfully measured the cross-sectional average velocity. The agreement between FATS and acoustic Doppler current profilers (ADCPs) on water discharge was satisfactory. Moreover, the temporal variation of the cross-sectional average temperature deduced from the sound speed of FATS was similar to that measured by a temperature sensor near the bank.
|Keywords： streamflow fluvial acoustic tomography cross-sectional average velocity unsteady flow water temperature|
|Received 2010-04-01 Revised Online: 2010-04-02|
This work was supported by the Construction Technology Research and Development Program of the Ministry of Land, Infrastructure, Transport and Tourism of Japan (No. 31), and the River Fund (N0.19-1212-005, 21-1212-009).
|Corresponding Authors: Kiyosi KAWANISI|
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