Seiches in Some Lakes of Japan. 



73 



successive days. The recorded amplitudes were greater than those 

 in Yamanaka lake, yet as the accompanying curves show, they were 

 not generally large enough to allow us to determine the phases and 

 the periods exactly. As might he expected from the complex form 

 of the lake, a number of differtent oscillations were observed. 



TABLE 33. 



Funatsu. . . . 



22.80 X 10, 



11.24x17, 



10.89x11, 



8.6ÜX10, 







Nagasaki. 



23.37 X 3, 



11.42 X 3, 



10.52 X 7, 



S.58X 3, 





6.50x4. 



Unoshima. 





11.46 X 4, 



10.59 X 8, 



8.27 X 2, 



7.82x4. 





Nagahama. 



23.05 X 9, 



11.30 X I, 









6.22 X 2. 



The weighted means of these periods are 



Ti=22.98 minutes, 



2^2=11.50 



r3=10.66 



1\= 8.58 



T,= 7.82 



T,= 6.36 

 which stand in the ratios 



rj:T2:T3:r,:T,:rs=1.00:0.50: 0.46:0.37: 0.34:0.27. 

 As Ti was most frequently observed at the two end stations, 

 Funatsu and Nagahama, there is no doubt that it was the uninodal 

 longitudinal seiche. The comparison of the phases shows us also 

 that these stations were in opposite phases (Figs. 18 a and b). It 

 is a remarkable fact that other oscillations were seldom observed 

 on the western, or Nagahama^ side of the lake. 



From the total surface area A and the total volume V of the 

 lake, calculated from the data obtained by our soundings, viz. 



