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Title: A new practical method to simulate flood-induced bridge pier scour—a case study of Mingchu bridge piers on the Cho-Shui river
Authors: Hong, Jian-Hao
Guo, Wen-Dar
Chiew, Yee-Meng
Chen, Cheng-Hsin
Keywords: General Scour
Bridge Pier Scour
DRNTU::Engineering::Civil engineering
Issue Date: 2016
Source: Hong, J.-H., Guo, W.-D., Chiew, Y.-M., & Chen, C.-H. (2016). A New Practical Method to Simulate Flood-Induced Bridge Pier Scour—A Case Study of Mingchu Bridge Piers on the Cho-Shui River. Water, 8(6), 238-. doi:10.3390/w8060238
Series/Report no.: Water
Abstract: The evolution of bridge pier scour is very important for bridge safety warning and assessment. During typhoon seasons in Taiwan, the torrential river flow often causes scour monitoring instruments to fail in their attempt to measure the temporal variations of pier scour depths. To better understand the scouring phenomenon during a large flood event, this study proposes a fast and reliable method for bridge pier scour simulation. The proposed method consists of two main components: (1) a robust finite-volume hydraulic model that simulates the flow depth and velocities; and (2) two scour depth computation algorithms that predict the temporal development of the general and local scour depths. The greatest advantage of this method is that it is very straight-forward and reliable, giving bridge managers sufficient time to make an informed decision for bridge safety warning. Only a few hydraulic flow conditions near the bridge are necessary to simulate the scour depth evolution. Moreover, the method can be applied for both general and local scour simulations. To demonstrate the accuracy of the proposed method, field data collected using the “numbered-brick” method were performed at the Mingchu Bridge, which is located along an incised channel reach of the Cho-Shui River in Taiwan. The simulated water levels and total scour depths are in good agreements with the field data. Finally, to help bridge authorities responsible for making a decision towards bridge scour warning, a bridge safety curve (scoured bed level-discharge relationship) is proposed. Based on the results of two flood events, the study shows that the proposed method can quickly and accurately simulate the bridge pier scour.
ISSN: 2073-4441
DOI: 10.3390/w8060238
Rights: © 2016 by The Authors, licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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