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A new assessment of river environment using the riverbed sediment is proposed in this study. Field observations for riverbed sediment, water quality and river plant were conducted at 4~12 points in the ten first-class rivers of Chugoku District. As a result, there isn't any significant correlation relationship among the water quality, the stable isotope ratios of nitrogen (δ 15 N) in the sediments and in the river plant. However, δ 15 N in the riverbed sediments have a clear relation with the amount of nitrogen load from the catchment which is estimated using GIS analysis. This result indicates that the δ 15 N in the sediments can be an indicator of the river environment.

ASSESSMENT OF RIVER ENVIRONMENT BASED ON RIVERBED SEDIMENT IN THE FIRST CLASS RIVERS OF CHUGOKU DISTRICT