Mitigation of Scour Failure Risk of a River Bridge Located in an Ungauged Basin

IF 0.6 4区 工程技术 Q4 ENGINEERING, CIVIL Baltic Journal of Road and Bridge Engineering Pub Date : 2021-03-29 DOI:10.7250/BJRBE.2021-16.514
Hüseyin Akay
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引用次数: 3

Abstract

In this study, scour failure risk of the Catalzeytin Bridge located in the Western Black Sea Basin, Turkey, was assessed for possible future flood events and appropriate scour countermeasures were considered based on economic and constructability considerations. Waterway adequacy in the spans of the bridge and scour criticality around bridge foundations considered for risk calculations in HYRISK were estimated by hydrological and hydraulic analyses of the watershed and stream. Since the watershed of the bridge is ungauged, geomorphological instantaneous unit hydrograph concept was adopted to estimate the peak discharges with various return periods to be used in hydraulic modelling. Monte Carlo simulation results indicated that most of the simulated peak discharges were in the 95% confidence interval. Hydraulic model results from HECRAS indicated that waterway adequacy and scour criticality were critical for discharges with 200 and 500-year return periods. Scour failure risk of the Catalzeytin Bridge was classified as high and it was proposed to reduce the risk by constructing partially grouted riprap as the most feasible alternative that would consequently increase the expected lifespan of the bridge. Following this methodology, river bridges may be prioritized based on the risk analysis.
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位于未挖掘盆地的河桥冲刷破坏风险的缓解
在本研究中,对位于土耳其黑海盆地西部的Catalzeytin大桥的冲刷破坏风险进行了评估,以应对未来可能发生的洪水事件,并基于经济和可施工性考虑考虑了适当的冲刷对策。通过对流域和溪流的水文和水力分析,估计了HYRISK风险计算中考虑的桥梁跨度中的水道充足性和桥梁基础周围的冲刷临界性。由于桥梁的分水岭是未测量的,因此采用了地貌瞬时单位过程线概念来估计水力建模中使用的不同重现期的峰值流量。蒙特卡罗模拟结果表明,大多数模拟峰值放电都在95%的置信区间内。HECRAS的水力模型结果表明,水道充足性和冲刷临界性对于200年和500年重现期的流量至关重要。Catalzeytin大桥的冲刷破坏风险被归类为高风险,建议通过建造部分灌浆抛石作为最可行的替代方案来降低风险,从而延长大桥的预期寿命。根据这种方法,可以根据风险分析对河桥进行优先排序。
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来源期刊
Baltic Journal of Road and Bridge Engineering
Baltic Journal of Road and Bridge Engineering 工程技术-工程:土木
CiteScore
2.10
自引率
9.10%
发文量
25
审稿时长
>12 weeks
期刊介绍: THE JOURNAL IS DESIGNED FOR PUBLISHING PAPERS CONCERNING THE FOLLOWING AREAS OF RESEARCH: road and bridge research and design, road construction materials and technologies, bridge construction materials and technologies, road and bridge repair, road and bridge maintenance, traffic safety, road and bridge information technologies, environmental issues, road climatology, low-volume roads, normative documentation, quality management and assurance, road infrastructure and its assessment, asset management, road and bridge construction financing, specialist pre-service and in-service training;
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