水中視程に影響をおよぼす付着物質の反射率について

抄録

Colour and size of an object change as a result of adhesive organisms after it is set under-water for a long time and results in a great difference in underwater visibility. Samples of articles hung in the sea and removed at different time intervals for examination in the laboratory of its luminous reflectance. Underwater visibility of net twines (blue, grey and natural twine) increases with the adhesion of organisms on the twines and it was found that in about 40 days after being set it increases about two fold. In the present estimation, the apparent contrasts increase rectilinearlly with the decrease of visual angles and the luminous reflectances of objects decrease with the increasing of the underwater visibility. Apparently, it shows that the optical properties of the adhesive organisms greatly influence on the underwater visibility.