Experimental Study on the Effect of Local Scour Reduction of a Single Bridge Pier Using a Terrain-Adaptive Collar in a Single River Bend

Experimental Study on the Effect of Local Scour Reduction of a Single Bridge Pier Using a Terrain-Adaptive Collar in a Single River Bend | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Experimental Study on the Effect of Local Scour Reduction of a Single Bridge Pier Using a Terrain-Adaptive Collar in a Single River Bend Hongliang Qi, Yichen Zhang, Bohan Wang, Jiayang Yang, Hongjun Zhou This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8634806/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 10 You are reading this latest preprint version Abstract To address the problem that conventional bridge pier collars become suspended with the development of local scouring, leading to a reduction in their scour-mitigating effect and even total failure, this study designed a terrain-adaptive collar and investigated its effectiveness in mitigating local scour around bridge piers through laboratory flume experiments. The effects of different segmentation angles and segmentation tiers of the terrain-adaptive collar on the mitigation of local scour around bridge piers were investigated. The results demonstrate that the scour reduction efficiency of the terrain-adaptive collar is higher than that of the non-segmented collar, which has been enhanced from 58.82% (for non-segmented collar) to 74.51%. The number of segmentation tiers has a greater influence on the scour reduction efficiency of the terrain-adaptive collar than the segmentation angle, and the scour reduction efficiency generally increases approximately linearly with the number of segmentation tiers. For segmentation angle,a angle of 60° is recommended. The scour reduction efficiency of the terrain-adaptive collar initially increases and then decreases as the coverage percentage increases. The underlying mechanism primarily involves: this combination achieves the synergy of suppressing the peak of shear stress and the low vorticity flow field by balancing the dual mechanisms of energy dissipation through permeation and flow diversion and control. Coverage percentage of the terrain-adaptive collar between 68.7% and 79.5% is recommended, and the corresponding scour reduction efficiency is all greater than 70%. The findings can provide theoretical foundations and engineering references for local scour protection of bridge piers in a curved river bend. Bridge Pier Local Scour Local Scour Reduction Terrain-Adaptive Collar Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 13 Mar, 2026 Reviews received at journal 01 Mar, 2026 Reviews received at journal 15 Feb, 2026 Reviewers agreed at journal 11 Feb, 2026 Reviewers agreed at journal 09 Feb, 2026 Reviewers agreed at journal 09 Feb, 2026 Reviewers invited by journal 09 Feb, 2026 Editor assigned by journal 21 Jan, 2026 Submission checks completed at journal 21 Jan, 2026 First submitted to journal 18 Jan, 2026 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-8634806","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":588490171,"identity":"c335fbd1-a409-4854-a86b-2ccaf2bddeb5","order_by":0,"name":"Hongliang Qi","email":"","orcid":"","institution":"Chang'an University","correspondingAuthor":false,"prefix":"","firstName":"Hongliang","middleName":"","lastName":"Qi","suffix":""},{"id":588490172,"identity":"47f15ded-275c-49ef-933a-63ebba7ea342","order_by":1,"name":"Yichen 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The effects of different segmentation angles and segmentation tiers of the terrain-adaptive collar on the mitigation of local scour around bridge piers were investigated. The results demonstrate that the scour reduction efficiency of the terrain-adaptive collar is higher than that of the non-segmented collar, which has been enhanced from 58.82% (for non-segmented collar) to 74.51%. The number of segmentation tiers has a greater influence on the scour reduction efficiency of the terrain-adaptive collar than the segmentation angle, and the scour reduction efficiency generally increases approximately linearly with the number of segmentation tiers. For segmentation angle,a angle of 60\u0026deg; is recommended. The scour reduction efficiency of the terrain-adaptive collar initially increases and then decreases as the coverage percentage increases. 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