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1 2024

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The characteristics of a novel environmentally friendly countermeasure against bridge abutments scour depth

Shafai Bejestan Mahmood, Raee Narges, Azizi Reza

Acta Geophysica

2024

Vol. 72, no. 1

357--369

Destruction of many bridges around the world has been found to be due to the collapse of its abutments owing to the formation of scour. Various methods have been proposed so far to reduce the scour depth, and in this study, a new and environmentally friendly method, namely triangular vanes made with six-pillar concrete (TV-SPC) elements, has been experimentally studied. For this purpose, various experiments were carried out without and with installing the TV-SPC at different distances (0.5L, 1L and 1.5L in which L = abutment length), three different lengths, in different rows (single, double and triple) and under two different hydraulic conditions. At the end of each experiment, the bed topography around the abutment was measured and the maximum scour depth and its location were extracted. The results show that for better performance, the TV-SPC should be attached to the bank at distance of 0.75L or 1 L . The longest TV-SPS found better to reduce the scour depth. A single L-TV-SPC installed at 0.75L upstream of the abutment can result in 68% and 78% scour depth reduction at high and low flow conditions, respectively. The reduction in scour depth can be increased up to 82% by installing three rows of TV-SPC.