A RIVER-DISCHARGE MONITORING IN A TIDAL REACH WITH AN H-ADCP MEASUREMENT AND NUMERICAL SIMULATION

Abstract

We have recently developed a new river-discharge monitoring system with an H-ADCP measurement and numerical simulation in which a DIEX method is used to accurately interpolate and extrapolate the observed velocities in a cross section with satisfying dynamic principles. In the present study, we attempt to apply this system into the discharge monitoring in the tidal reach of the Sumida River. The measuring accuracy of the H-ADCP is strongly influenced by vertical density stratification and high turbidity conditions, showing that the range of the data assimilation in the DIEX method must be changed due to these conditions. The simulated discharge with the present system gives acceptable agreements with the observed results, indicating the fundamental applicability of the present system into the discharge monitoring in tidal rivers.