Author(s): S. M. Borghei
Linked Author(s):
Keywords: Local scour; Sluice gate; Diversion guide wall; Hydraulic model; Scour profile
Abstract: Local scour downstream of sluice gates in the erosive bed is one of the main concerns of hydraulic engineers. It can cause serious damage to the structure due to large-scale erosion. One of the ways to overcome this problem is the use of apron, or non-erosive bed. The apron should be long enough that not only the hydraulic jump occurs on it but, also by the time the flow reaches the loose bed it is uniform and calm. The optimum length of the apron is for the turbulence and eddies to die out before they can cause serious scouring. In order to shorten the apron or decrease the effect of the turbulence flow, a variable width apron with divergence guide walls can be used. Therefore, hydraulic model using sluice gate with variables such as: discharge, tailwater depth and guide wall angle have been used. The results of more than 100 tests show that while by increasing discharge and Froude number, the depth of scour increases, increase of tailwater depth and guide wall opening angle, decreases the scour depth. Also for all the tests (with the four variables) the non-dimensional scour profile is the same. Finally design suggestions are provided.
Year: 2001