Hybrid scour depth prediction equations for reliable design of bridge piers

Hamidifar, H, Zanganeh-Inaloo, F and Carnacina, I (2021) Hybrid scour depth prediction equations for reliable design of bridge piers. Water, 13 (15). ISSN 2073-4441

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Abstract

Numerous models have been proposed in the past to predict the maximum scour depth around bridge piers. These studies have all focused on the different parameters that could affect the maximum scour depth and the model accuracy. One of the main parameters individuated is the critical velocity of the approaching flow. The present study aimed at investigating the effect of different equations to determine the critical flow velocity on the accuracy of models for estimating the maximum scour depth around bridge piers. Here, 10 scour depth estimation equations, which include the critical flow velocity as one of the influencing parameters, and 8 critical velocity estimation equations were examined, for a total combination of 80 hybrid models. In addition, a sensitivity analysis of the selected scour depth equations to the critical velocity was investigated. The results of the selected models were compared with experimental data, and the best hybrid models were identified using statistical indicators. The accuracy of the best models, including YJAF-VRAD, YJAF-VARN, and YJAI-VRAD models, was also evaluated using field data available in the literature. Finally, correction factors were implied to the selected models to increase their accuracy in predicting the maximum scour depth.

Item Type:	Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TG Bridge engineering
Divisions:	Civil Engineering and Built Environment
Publisher:	MDPI AG
Date of acceptance:	21 July 2021
Date of first compliant Open Access:	14 September 2021
Date Deposited:	14 Sep 2021 10:47
Last Modified:	14 Sep 2021 11:00
DOI or ID number:	10.3390/w13152019
URI:	https://ljmu-9.eprints-hosting.org/id/eprint/15486

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