On the influence of the polderling of lake Togo-ike for the Togo hot spring group

概要

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The lake Togo-ike with its area of 4. 1 km2 and maximum depth of 5. 2 m. is a brackish lake and situated on the middle part of Tottori Prefecture. There are many hot springs such as Togo, Shin-Togo and Asazu in and around the lake. The authors studied the influence of the change of lake level due to polderling on the discharge of hot springs. The results obtained are summarized as follows : (1) Togo hot spring group has the same chemical constituents and ground temperature, suggesting that they have the same origin under the ground. (2) Some of these springs discharge through the lake bottom into the lake, but they give little influence on the quality of lake water. (3) Factors which will affect the discharge of spring water are barometric pressure, rain-fall amount, lake level change, tidal change and pumping. Barometric change and tidal change are not separated. Distinguished effects of rain-fall and lake level upheaval are shown in Table 5. Pumping effect is also obvious. (4) The effect of lake water level change on the spring discharge, dQ/dh is larger at Azusa than that of at Togo (Table 6). It suggests that change of lake water level affects directly to the discharge of hot spring. The results above mentioned lead us to the conclusion that the polderling of this lake will cause the decrease of hot spring discharge.
日本陸水学会の論文