Reducing Local Scouring at Bridge Piles Using Collars and Geobags

Table 2

Percentage of reduction of scour depth at the rear pile.

Number	Type of countermeasure	Scour reduction after 24 h, (%)
1	None	—
2	Perspex collar	20
3	Aluminum collar	76
4	Steel collar	96
5	Geobag	44
6	Perspex collar and geobag below sediment	86
7	Aluminum collar and geobag below sediment	88
8	Steel collar and geobag below sediment	96