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In-Depth Information
0.500
Ks/Du=18.75E-6
Ks/Du=10.50E-6
Ks/Du=8.73E-6
0.450
0.400
0.350
0.300
0.250
0.200
0.150
0.100
0.050
0.000
0
0.1
0.2
0.3
0.4
0.5
Fr
Fig. 4
The relation between the Froude number of the upstream and discharge ratio
0.6
Ks/Du=18.75E-6
Ks/Du=10.50E-6
Ks/Du=8.73E-6
R
2
= 0.72
R
2
= 0.88
0.5
0.4
R
2
= 0.72
0.3
0.2
0.1
0
0.200
0.250
0.300
0.350
0.400
0.450
0.500
Qr
Fig. 5
The relation between
Q
r
and
G
r
in different roughness ratios
As said before, the sediment concentration in all the tests would be the same.
Figure
5
shows the relation between
Q
r
and
G
r
.
It can be seen that at all three depths, the two ratios
Q
r
and
G
r
are in proportion to
each other. It should be noted that the diversion flow ratios for each depth are
chosen according to the flow free state, so for each depth they are positioned in a
particular bound.
As one can see, the fitted slope line for a depth of 10 cm is less than for the other
two depths. At this depth, due to the secondary current strength, when
Q
r
increases,
the rate of increase in the sediments entry to the intake is less than at the other two
depths. As stated by Raudkivi (
1993
), the secondary current strength and the
infiltrating sediments decline along with the increase of the roughness ratio. The
roughness ratio corresponding to a depth of 10 cm is high (
k
s
/
D
u
ΒΌ
18.75E-6),
followed by decrease of the infiltrating sediments. In Fig.
6
, the results of this study
