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Article

A Study on Interaction between Overfall Types and Scour at Bridge Piers with a Moving-Bed Experiment

1
Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 701401, Taiwan
2
Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan
*
Author to whom correspondence should be addressed.
Water 2021, 13(2), 152; https://doi.org/10.3390/w13020152
Received: 15 December 2020 / Revised: 8 January 2021 / Accepted: 8 January 2021 / Published: 11 January 2021
(This article belongs to the Special Issue Soil–Water Conservation, Erosion, and Landslide)
River slopes can be changed due to an extreme event, e.g., a large-scale earthquake. This can uplift a riverbed greatly and thereby change the behavior of the river flow into a free or submerged overfall. Corresponding damage, including extreme erosion, on bridge piers located in the river can take place due to the aforementioned flow conditions. A reconstructed bridge pier in the same location would also experience a similar impact if the flow condition is not changed. It is important to identify these phenomena and research the mechanism in the interaction between overfall types and scour at bridge piers. Therefore, this paper is aimed at studying a mechanism of free and submerged overfall flow impacts on bridge piers with different distances by a series of moving-bed experiments. The experiment results showed clearly that bridge pier protection requires attention particularly when the pier is located in the maximum scour hole induced by the submerged overfall due to the z directional flow eddies. In many other cases, such as when the location of the bridge pier was at the upstream slope of a scour hole induced by a flow drop, a deposition mound could be observed at the back of the pier. This indicates that, while a pier is at this location, an additional protection takes place on the bridge pier. View Full-Text
Keywords: bridge pier; overfall; scour; landform change impact on pier bridge pier; overfall; scour; landform change impact on pier
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MDPI and ACS Style

Lee, W.-L.; Lu, C.-W.; Huang, C.-K. A Study on Interaction between Overfall Types and Scour at Bridge Piers with a Moving-Bed Experiment. Water 2021, 13, 152. https://doi.org/10.3390/w13020152

AMA Style

Lee W-L, Lu C-W, Huang C-K. A Study on Interaction between Overfall Types and Scour at Bridge Piers with a Moving-Bed Experiment. Water. 2021; 13(2):152. https://doi.org/10.3390/w13020152

Chicago/Turabian Style

Lee, Wei-Lin; Lu, Chih-Wei; Huang, Chin-Kun. 2021. "A Study on Interaction between Overfall Types and Scour at Bridge Piers with a Moving-Bed Experiment" Water 13, no. 2: 152. https://doi.org/10.3390/w13020152

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