Author(s): Junki Yano; Kiyosi Kawanisi; Mahdi Razaz
Linked Author(s): Kiyoshi Kawanishi
Keywords: Coustic tomography; Streamflow; Salinity; Tidal estuary; Long-term measurement; Flood event
Abstract: In many cases, river discharge is indirectly estimated from water level or streamflow velocity near the water surface. However, these methods have limited applicability because of low temporal or spatial resolution. In this study, an innovative system, the fluvial acoustic tomography system (FATS), was used for long-term continuous discharge and salinity measurement. FATS can measure streamflow for long-term continuously and with fairly high temporal resolution, 1/60 Hz, even in extreme hydrological events such as flood. In addition to measuring cross-sectional mean velocity, a by-product of FATS report is cross-sectional average salinity. In this note, we compared that from conductivity-temperature, hereafter C-T, sensors. The comparison between the two sets of salinity data indicated the consistency between FATS reports and those recorded by the C-T’s. Moreover, this work describes our efforts for studying streamflow variation during long periods of time using FATS in a tidal estuary with saltwater. The observation period includes a flood event which let us to investigate flood implications to the FATS functionality. In study area, low freshwater discharge and gravitational wining sea water intrudes upstream even during the ebb.
Year: 2012