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Table 2

Comparison of efficiency of different models used for reducing scour around cylindrical pier

Test no.Slots and collarsEquilibrium max. scour depth (dse-mm)
Reduction in scour depth, Rp (%)
US pierDS pierUS pierDS pier
Solid pier 59 36 –– –– 
Parallel slot 46 26 22.0 27.8 
Y-slot 31 25 47.5 30.6 
T-slot 29 24 50.8 33.3 
Sigma-slot 24 17 59.3 52.8 
Flat collar 24 100.0 33.3 
Wing collar 90° 11 24 81.4 33.3 
Wing collar 45° 17 18 71.2 50.0 
Conical collar 14 100.0 61.1 
Test no.Slots and collarsEquilibrium max. scour depth (dse-mm)
Reduction in scour depth, Rp (%)
US pierDS pierUS pierDS pier
Solid pier 59 36 –– –– 
Parallel slot 46 26 22.0 27.8 
Y-slot 31 25 47.5 30.6 
T-slot 29 24 50.8 33.3 
Sigma-slot 24 17 59.3 52.8 
Flat collar 24 100.0 33.3 
Wing collar 90° 11 24 81.4 33.3 
Wing collar 45° 17 18 71.2 50.0 
Conical collar 14 100.0 61.1 

US, upstream; DS, downstream.

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