A PRELIMINARY STUDY ON THE EFFECTS OF WATER POLLUTION ON THE RATE OF EVAPORATION FROM THE WATER SURFACE

概要

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The effects of water pollution on the rate of evaporation from the surface of water were examined. The evaporation from the surface of several kinds of polluted water, such as polluted river water, sea water, pulp-mill waste water and diesel oil-polluted water, from vessels were compared with the evaporation from distilled water. Reduction of evaporaton following to the decrease of vapor pressure with increased solutes in the water was rather small. The colored water and suspended matters increased the absorption of the solar radiation which raised the temperature of the surface of water leading to the increase of evaporation. Evaporation from the surface was disturbed significantly by the coverage with oil film. The stability of the oil film depended on the wind speed over the surface. Though the direct measurement of the amount of evaporation from the natural water bodies is difficult, some possibilities of the change of the rate of evaporation by water pollution is estimated from these experiments. Further, it is expected that the future expansion of oil pollution on the surface of the ocean may cause some climatic changes on the earth.
The Association of Japanese Geographersの論文