Abstract
Not only matching Sabo facilities to surroundings but also making them suave to the human sense of vision becomes very important these days. In this point of view, here the focus is put on the reflection pattern of stream surface at torrents or at channel works. They were investigated by means of spacial frequency fluctuation, questionnaire, and multi-discriminant analysis. Natural flow or stone made dam used to be felt as having “bland surfce pattern” for the sense of vision, therefore they are supposed to have “bland fluctuation i. e. 1/f fluctuation (f: frequency) ”. In this aspect, it is found consequently that the stream with 1/f fluctuation have suave surface pattern that means “the human touch bland pattern”.
