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Using oxygen isotopic ratio and humidity, a new simple method of measurement for an evaporation rate in a lake is proposed. The oxygen isotopic ratio of the Inawashiro Lake is thought to have increased from -10.3‰ to -9.3‰ estimating from river flow rates and lake and river oxygen isotopic ratios. As a result of some evaporation experiments, the relation between evaporation ratio, initial oxygen isotopic ratio and humid was analyzed and then the evaporation ratio in the Inawashiro Lake was estimated 5.6 % from the relation and oxygen isotopic ratios. The evaporation in the Inawashiro Lake is calculated about 560 mm per year from 5.6 % evaporation ratio, lake inflow and lake area and is in agreement with that estimated by Jacob equation.

PROPOSAL OF SIMPLE MEASUREMENT METHOD FOR EVAPORATIO RATE BY USING OXYGEN ISOTOPIC RATIO IN THE INAWASHIRO LAKE