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Long-duration observations of salinity distribution were conducted at 4.8 km upstream from the mouth of the Ohtagawa diversion channel where flow and density conditions change significantly. In addition, measurements of tidal current and suspended particulate matter (SPM) were carried out, using an acoustic Doppler current profiler. The long deployment periods allowed us to examine the effect of a flood incident, wind, mean depth, and both semi-diurnal and neap/spring aspects of tides. The influences of the river discharge, wind, tidal range, and mean depth on the transport of saltwater and SPM were examined by the regression analysis. The direction of the mean SPM transportation was toward upstream for the restricted freshwater discharge. The upstream SPM flux increased with the increasing tidal range. Conversely, the intrusion of salt water was suppressed by the tide.

TRANSPORT CHARACTERISTICS OF SALT WATER AND SPM IN THE OHTAGAWA DIVERSION CHANNEL