Figures 13 show the movement of matter floating 
naturally, indicated in the longitudinal course shown 
earlier in fig.11. From observation of the two figures, the 
time for movement was roughly 5.5~5.6s. The velocity 
of the flow is expressed as a distribution. The values are 
obtained by respectively dividing the levels by the 
shutter time (At=5.5s), which is the absolute velocity of 
the flow vector. 
Additionally, the area of energy concentration seems to 
be directed downward and toward the right shoreline 
    
ophoto 
surface of the water 
irds-eye view photograph of flood 
   
  
  
  
  
  
   
  
  
  
  
  
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
   
  
  
  
     
   
  
  
  
  
  
  
  
   
    
    
while changing shape in a complex manner. However, a 
close analysis of Fig.13 reveals that this area is also 
connected to the are of concentration at the centerline of 
the river. It was therefore judged that the areas of 
concentrated energy were connected by eddy currents. 
It is believed that visualization of the flow phenomena 
using this photography technology will play a critical role 
in providing an understanding of the complicated factors 
related to discharge duration. 
   
flow emphasized the height changes in 
Fig.13 . Birds-eye view of kinetic energy in the flow 
854 
  
From 
effecti 
to Ja 
confirr 
1) Riv 
conste 
measL 
Conse 
prover 
surfac 
2) iti 
kinem: 
meas 
syster 
3) It 
utilizin 
airplar 
bodie: 
4) Ta 
of un 
speed 
5) it: 
of flo 
image 
water: 
6) Iti 
for the 
measi 
three- 
| wish 
Kimot 
Atsus 
their 
cuttin 
resea 
sincei 
for tl 
shutte 
Wilbe 
photo 
Engin 
Ryos: 
surfa 
photo 
and r 
Semi 
Ryos: