Continuous monitoring of river discharge in a tidal reach with an h-adcp measurement and numerical simulation.
Yasuo Nihei, Yasuo Harada, Jin Kashiwada, Daisuke Negishi
Thursday 2 july 2015
8:45 - 9:00h
at Africa (level 0)
Themes: (T) Special session, (ST) Acoustic monitoring of flow, turbulence and river discharge
Parallel session: 10F. Special session: Acoustic monitoring of flow, turbulence and river discharge
We have developed a new river-discharge monitoring system with an H-ADCP measurement and numerical simulation in which a DIEX (Dynamic Interpolation and EXtrapolation) 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 Naka, Sumida, Ara and Sagami Rivers, Japan. 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.
