社団法人日本機械学会 Acta Medica Okayama 0387-5016 56 526 1990 雪層中の水分飽和度測定に関する基礎研究 226 230 EN Hideo Inaba Hideo Otake This reports two measuring methods of the water saturation rate in a snow layer melted from above, investigated, which is important to explain the water permeability in the snow layer. One of the methods is to measure the electric resistance of the wet snow existing between two electrodes which are supplied with a high-frequency alternating current. This method is suitable for measuring the water saturation rate of the wet snow at a local part of the snow layer during long periods of time. The other methed is to measure the gradation of the infrared photograph by the use of the thermal emissivity difference between water and snow. The calibration curve between the gradation of infrared photograph and the water saturation rate is examined in the preliminary run. This measuring method is useful to obtain information on the water saturation rate of the wet snow in a two-dimensional plane. The obtained results show that these two measuring methods are convenient for predicting the water movement behavior in the snow layer. No potential conflict of interest relevant to this article was reported.