INVESTIGATING THE FLOW CHARACTRISTICS DUE TO CHUTE AND BAFFLE BLOCKS (Case Study: New Assiut Barrage Spillway)

Document Type : Original Article

Authors

1 Associate Professor, Hydraulics Research Institute, National Water Research Center, Egypt Researcher, Hydraulics Research Institute, National Water Research Center, Egypt

2 Professor, Channel Maintenance Research Institute, National Water Research Center, Egypt

Abstract

sluiceway with baffles using a 2-D flume model. Head losses between the upstream and downstream of the
sluiceway gate, pressure along the inclined drop and on the horizontal apron were measure and calculated. Local
head losses due to sill and flow velocities were measured. Ten tests for fully opened gate (flood evacuation)
were carried out. Two tests were conducted to test the cases before and after implementing of chute-blocks on
the inclined drop together with baffled apron. During these tests, the velocity was varied between 4.0 m/s to 4.5
m/s by varying the discharges from 5000 m3/s to 7000 m3/s. The results showed that, the maximum calculated
head loss after installing the chute and baffle blocks were 0.02 m and 0.27 m when the flow discharge was
increased from 5000 to 7000 m3/s, respectively (i.e. the losses increased by 92.6 % when the discharge increased
by 28.5 %). The maximum measured head losses after installing the chute and baffle blocks were 0.03 m and
0.23 m when the discharge was increased from 5000 m3/s to 7000 m3/s, respectively (i.e. the losses increased by
87 % when the discharge increased by 28.5 %). On the other hand, the maximum pressure values before and
after installing the chute and baffle blocks were 13.9 m and 13.93 m at a discharge of 5000 m3/s. These values
were 15.44 m and 16.14 m at a discharge of 7000 m3/s. The study concluded that adding the chute and baffle
blocks has no sensible effect on the pressure and the head losses values.

Keywords

ERJ. Engineering Research Journal
Volume 35, Issue 4
October 2012
Pages 359-372

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