Staff Members - Benha University
Minimizing Scour of Contraction Stepped Spillways
Journal of Engineering Research and Reports • 2018
Publication Information
Authors
A. Shawky Awad, T. Hemdan Nasr-Allah, Y. Abdallah Mohamed
and G. Mohamed Abdel-Aal
Keywords
Stepped spillways; scour; breakers; openings and divergent angle.
Journal
Journal of Engineering Research and Reports
Publisher
Not Available
Volume
Not Available
Issue
Not Available
Pages
Not Available
publication.type
International
Paper Link
Not Available
Supplementary Materials
Not Available
Abstract
The scour downstream spillways can endanger the stability of the dams. Hence, determining the
scour depth downstream of spillways was vital importance which scours holes formed around and
near the foundations of spillways can endanger the stability of dams and may lead to their failure.
So, this paper, investigate the scour downstream contraction stepped spillways. The experimental
flume used 16.2 m length, 66 cm width and 65 cm depth. The used number of stepped spillways
was 4 Sep, contraction ratio was 60% from flume width and the opening area in breaker 10% from
the breaker area on all sides putting in down of breakers. The breaker used above the stepped
spillway with different shapes of openings as rectangle, triangle and trapezoidal and different
numbers by 2, 4, 6 and 8 of beakers. The divergent angle changes by 45º, 30º, 15ºand 10º. The
results were showed that the best numbers of openings is 4openings with rectangle shape
because it reduces the scour by 54.51%. In finally to improve this scour by divergent angle lead to
the best angle is 10º can minimize the scour is 65.38%.
scour depth downstream of spillways was vital importance which scours holes formed around and
near the foundations of spillways can endanger the stability of dams and may lead to their failure.
So, this paper, investigate the scour downstream contraction stepped spillways. The experimental
flume used 16.2 m length, 66 cm width and 65 cm depth. The used number of stepped spillways
was 4 Sep, contraction ratio was 60% from flume width and the opening area in breaker 10% from
the breaker area on all sides putting in down of breakers. The breaker used above the stepped
spillway with different shapes of openings as rectangle, triangle and trapezoidal and different
numbers by 2, 4, 6 and 8 of beakers. The divergent angle changes by 45º, 30º, 15ºand 10º. The
results were showed that the best numbers of openings is 4openings with rectangle shape
because it reduces the scour by 54.51%. In finally to improve this scour by divergent angle lead to
the best angle is 10º can minimize the scour is 65.38%.