降雨時におけるファサード色の視覚効果と印象評価の変化に関する研究

抄録

 Rain is an important factor in capturing the landscape, and in Japan, rainfall has long been a feature of landscape appreciation. However, in the previous studies, there are many studies discussing rainfall as a negative because it is a factor in the degradation of buildings. Studies about rainfall as a positive, or as the object of landscape appreciation, have not been plentiful. In Japan, there is much rain season, landscape planning and landscape color plans should have been focusing on rainy landscapes.

 In this study, rain should be taken into consideration as an important factor in landscape color planning, and the visual effects and impression of colors on façades during rainfall were investigated. Verification experiments were conducted in a rain simulation device that can control rainfall and illuminance.

 Experiments were conducted based on an experimental design with four factors of hue (5R / 5Y / 5G / 5PB), Chroma, lightness, and rainfall. In the rainfall simulation experiment, the visual effect of the color based on visual colorimetry, and conducted impression evaluations. The findings obtained by the verification are as follows.

 First, in order to examine the color lightness of the visual effect, visual colorimetry by Value of the color was conducted. It was found that the Value of the color got higher during rainfall. The color Hue (5R/5G/5PB) showed that the lightness effect of the color Value was at its maximum in rainfall 11mm/h, and above that the lightness effect of the color Value began decreasing. At the same time, the color of Hue 5Y showed that the lightness effect of the color Value increased as rainfall increased.

 Next, in order to examine the color saturation of the visual effect, we conducted visual colorimetry by Chroma of the color. It was found that the Chroma of the color got lower at rainfall. The color of Hue (5Y/5G/5PB) showed that the somber effect of the color Chroma increased with increasing rainfall. Other hand, the color of Hue 5R showed that the somber effect of the color Chroma decreased with increasing rainfall.

 Also, in order to examine the texture as an impression of color, we evaluated impression. It was found that the color impression became soft during rainfall. It is thought that the lightness of the color increased because of the rainfall, hence softening the texture of the color. Impression was evaluated in order to examine liveliness as an impression of color. By analysis only the color of Hue 5R took on a lively impression at rainfall, with the effect reaching its maximum when rainfall was at 11mm/h. It is thought that the movement of rain changed because of the rainfall, and the color took on a lively impression through its influence. Finally, impression was evaluated to examine the aesthetic sense of colors. It was demonstrated that only the warm color of Hue (5R/5Y) took on a beautiful impression at rainfall. We believe that the movement of rain was changed by the rainfall, and the color took on a beautiful impression by its influence.

 From our findings, the relationship between rainfalls and the visual effects and impressions of color were confirmed, and there were differences in the evaluation depending on the Hue and the amount of rainfall. In landscape color planning, it was to consider the influence of rainfall is important for a fascinating landscape. This study will show basic important references of such new landscape color plan.