摘要：In the present study the effect of the skew-angle of the alignment
of tandem piers on local scour depth around them is investigated. The
tandem piers were aligned with different skew-angles of 𝜃𝜃 =
0°
,30°
,45°
, 60°
,90° with respect to the flow direction. The results indicate
that with the increment of the skew-angle, the influence of sheltering effects
is decreased. In other word, since the sheltering effect of the upstream pier
is declined (which reduces the approach velocity for the downstream pier)
the scour depth around downstream pier increases. The results show that the
maximum scour depth occurs at both piers for the skew-angle of 𝜃𝜃 = 45°
.
Furthermore, the best configuration to aligned tandem piers was achieved at
the skew-angle of 𝜃𝜃 = 30°
.
其他摘要：In the present study the effect of the skew-angle of the alignment of tandem piers on local scour depth around them is investigated. The tandem piers were aligned with different skew-angles of θ=0°,30°,45°,60°,90° with respect to the flow direction. The results indicatethat with the increment of the skew-angle, the influence of sheltering effects is decreased. In other word, since the sheltering effect of the upstream pier is declined (which reduces the approach velocity for the downstream pier) the scour depth around downstream pier increases. The results show that the maximum scour depth occurs at both piers for the skew-angle of θ=45°.Furthermore, the best configuration to aligned tandem piers was achieved at the skew-angle of θ=30°.
