Abstract
This paper investigates changes in the visual perception of a stream landscape due to remediation work (i.e., the construction of a stone revetment, which is a common ecological engineering technique in Taiwan) in the Nan-Shi-Ken stream. Various images of the Nan-Shi-Ken streambank before and after remediation were collected. The visual preference (P) and perceived naturalness (N), which were selected as indices of visual perception, were quantified using a questionnaire survey. The image characteristics were analyzed by the image spectrum method and presented by the spectrum-frequency slope (S). Furthermore, the relationship between S and the visual perceptual reaction was presented. The results of this study demonstrate that P and N increase with increasing vegetative cover on a stone revetment after stream remediation. P and N were highly correlated with S and proportional to S. S provides an index to assess P or N for a stream landscape change due to variation in vegetation.
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