水質の変化が住民の河川に対する意識に与える影響

抄録

This paper is designed to present the correlaton between water quality of a river and people's opinion about it.
Umeda River, which is running through the central area of Sendai, has improved its water quality in recent 25 years, particularly in the middle reaches.
Opinion of people who live along the midstream of the river was examined and analyzed comparing with opinion of those who live in different areas, along the upper and lowerstream.
The result indicates that:
1. People who are along the midstream feels that the river became clearer and that they need to keep it clear. They feel that more strongly than people in other areas do.
Particularly people over 30 have recognized the improved clearness of the river.
And, since local river clearing activities are conducted by rather aged people, -the survey showed they're over 45, these clearing will soon be discontinued, if there isn't any administrative guidance.
2. Only a subtle change in BOD didn't cause noticeable change in people's opinion. They even grow the negative impression on its clearness when the change is not remarkable enough.