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The Area of Scour Hole Around Bridge Piers

by Tsan-wen Wang, Natl Taiwan Univ, Taiwan,
Sin-zee Chang, Natl Taiwan Univ, Taiwan,



Document Type: Proceeding Paper

Part of: Sediment Transport Modeling

Abstract:

The study is focused on what parameters determine the area of scour hole around bridge piers. An analytical study based on momentum principle has been used to reveal the variables involved and dimensional analysis is followed to show the parameters. Experimental work is conducted in a 20 m length, 0.6 m width and 0.8 m depth recirculating rectangular flume. Three kinds of sand with median particle diameter 0.97 mm, 0.43 mm, 0.19 mm were used to combine with various flow conditions and angles of attack from an aligned piers. Four cylindrical piers and five bluntnosed piers with five different length to width ratios were arranged for the test. The study shows that the area of scour hole around the bridge pier is a function of pier Fround number, pier dimension and bed material. An empirical formula based on experimental data is obtained to express the area of scour hole around the bridge pier.

Subject Headings: Piers | Scour | Bed materials | Parameters (statistics) | Bridges | Sediment transport | River and stream beds

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