35 
30 Fr = 
25 A 
   
  
  
  
  
  
  
  
   
  
: ; ; 1 i 1 Currents 
20 10 20 50 100 200 500 1000 m 
Fig.3 Relationships between Fig.5 Ocean currents and 
salinity and sea depth at counter currents off eastern 
sites a and b (See Fig.2) Hokkaido 
m3/sec 
1000 T T T T T T T T T T T T T T T 
L 1981 Aug.22 - 28 = 
L €;A 7 
E o0;B + 
  
  
1 I 
0o 12. 0 12 0 12 0 12 0 12 0 12 0 12 O Time 
22 23 24 25 26 27 28 Date 
  
  
Fig.4 Water volume variation of the Tokachi River at sites 
A and B (See Fig.2) 
   
(a):Aug.25,.1981 — Band 4 (b)-Sep.30,-1981^—:Band.4 
Photo 3 Feature Variations of bay current in Akkeshi Bay (Indicated 
with T in Photo 1) and water pattern in Lake Akkeshi (Indi- 
cated with S in Photo 1 also) 
222 
ts) Oct 
  
(e) F« 
Photo 3 Fe: 
wi 
car 
  
Photo 4 I 
01