Abstract
The hourly observations of dissolved O2, pH in water and meteorological elements were made from 16th to 17th Sept. at Lake Sanaru near Hamamatu. From these observations we obtained the following results:
1. The quantity of the dissolved O2 in the surface-and 1m-layers of the lake was supersaturated, the maximum value of O2 in the surface layer appeared at 15h. on 16th, showing 8.08 cc/L (145.7%) and the minimum at 7 h. on 17th. and the amplitude of diurnal change of O2 was 2.35 cc/L.
2. It is a remarkable characteristic that pH showed the value of above 9 (Thymol blue as indicator) all day long, and the value of pH was high at night. The feature of the diurnal change of phenolphthalein alkalinity nearly resembles that of pH.
3. As far as the present observation was concerned, we could not find out the remarkable relatiónship between the dissolved O2 and the some meteorological elements, it is still recognizable that an exponential relation exists between the value of dissolved oxygen and the mean velocity of wind.
