New acoustic system for continuous measurement of river discharge and water temperature  

作　　者：Kiyosi KAWANISI Arata KANEKO Shinya NIGO Mohammad SOLTANIASL Mahmoud F. MAGHREBI 

机构地区：[1]Graduate School of Engineering,Hiroshima University [2]Ministry of Land,Infrastructure,Transport and Tourism(Kitaku) [3]Civil Engineering Department,Ferdowsi University of Mashhad

出　　处：《Water Science and Engineering》2010年第1期47-55,共9页水科学与水工程（英文版）

基　　金：supported by the Construction Technology Research and Development Program of the Ministry of Land,Infrastructure,Transport and Tourism of Japan (No.31);the River Fund (N0.19-1212-005,21-1212-009)

摘　　要：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.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.

关 键 词：streamflow fluvial acoustic tomography cross-sectional average velocity unsteadyflow water temperature 

分 类 号：TV123[水利工程—水文学及水资源]