In this study, the spatial structures of Satogawa were clarified. Japanese landscape of the river was clarified by comparing the present landscape and mental landscape that residents draw.
Onogawa flowing through the central and southern part of Oita Prefecture has been the subject of this research. Surveyed villages estimated to Satogawa were chosen by the following three points. To the first point, village close to the river has been selected. To the second point, village with minimum houses to maintain river was chosen. To the third point, the river flowing through the village which width was less than 100meter more than 5meter was chosen.
We surveyed these chosen villages. The items obtained in the field survey were analyzed by mathematical quantification theory class III. Cluster analysis was performed by using the results of the mathematical quantification theory class III. The results of the analysis, Satogawa were classified into four clusters.
In the questionnaire survey, answers in all clusters were same answers that there were favorite landscapes nowadays than that of past. Features of favorite landscape were less weeds, wide water surface width and high visibility of the river. There were favorite landscapes in frequently using river section. Satogawa landscapes of each cluster were reproduced by the results of interview about landscape of the past.
From the foregoing, the following three points have been clarified. To the first point, spatial structure of Satogawa was clarified. To the second point, Satogawa were classified by the mathematical quantification theory class III and cluster analysis. To the third point, Satogawa landscape image, which is mental scenery, was created by interviews and questionnaire survey, and Guidelines for landscape restoration were shown.
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