Abstract
An acoustic Doppler profiler (NDP) mounted on a vessel was used to observe distributions of velocity and suspended particulate matter (SPM) in the Ohta Estuary. Salinity, temperature, turbidity, chlorophyll-a and water samples were also collected. The volume scattering coefficient deduced from NDP data correlated with the turbidity from optical backscattering sensor. The concentration and flux of SPM in the longitudinal section were investigated by the vessel-mounted NDP. During the early stage of flood tide, the highest concentration of SPM were found around 1, 000 m upstream. This high concentration was consequent on sediment resuspension caused by strong flood current. During the flood tide, the SPM concentration in lower layer became the maximum around 1, 000 m upstream and then decreased gradually as proceeding upstream. The downstream flux of SPM in upper layer was larger than that in lower layer during the ebb tide.
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