Abstract
In order to clarify formation process of water quality in tidal area of urban rivers, the field observation and its results of the salinity intrusion and spatial distribution of water quality in the tidal area of Kanda River, Nihonbashi River, Sumida River and Arakawa River are reported in this paper. From the results of field observation, following results are obtained; 1) BOD concentration show high value at Sotobori point and Upper stream of Sumida River and Arakawa River points. BOD Concentration of Arakawa River and Sumida River gradually decrease from the upper river side. 2) T-N and T-P concentration show high value at almost all observation points. 3) Salinity intrusion is a strong mixed type at high tide and weakly mixed type at low tide in Nihonbashi River. 4) After rainfall, dissolved oxygen concentra tion of Nihonbashi River is decreased, and it takes 6days to recover to initial concentration.
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