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

Hüseyin Akay


In this study, scour failure risk of the Çatalzeytin 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 Çatalzeytin 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.


GIUH; HYRISK; scour criticality; ungauged basin; waterway adequacy; Western Black Sea Basin

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Akay, H. (2019). Akım Ölçümü Olmayan Akarsular Üzerinde Yer Alan Köprülerin Göçme Riskinin Değerlendirilmesi. In Proceedings of the 4. Köprüler ve Viyadükler Sempozyumu (pp. 28–29). Turkey, Ankara. (in Turkish).

Akay, H., & Baduna Koçyiğit, M. (2020). Hydrologic Assessment Approach for River Bridges in Western Black Sea Basin, Turkey. Journal of Performance of Constructed Facilities, 34(1), 04019090.

Akay, H., Baduna Koçyiğit, M., & Yanmaz, A. M. (2018). Effect of Using Multiple Stream Gauging Stations on Calibration of Hydrologic Parameters and Estimation of Hydrograph of Ungauged Neighboring Basin. Arabian Journal of Geosciences, 11(11), 282.

Akay, H., Baduna Kocyigit, M., & Yanmaz, A. M. (2019). Development of a Safety-Inspection Method for River Bridges in Turkey. Water, 11(9), 1902.

Baduna Koçyiğit, M., & Akay, H. (2018). Estimation of Potential Flash Flood Risk in a Basin Using Morphometric Parameters: A Case Study of Akçay Basin. Journal of the Faculty of Engineering and Architecture of Gazi University, 33(4), 1321–1332.

Baduna Koçyiğit, M., Akay H., & Yanmaz, A. M. (2017). Effect of Watershed Partitioning on Hydrologic Parameters and Estimation of Hydrograph of an Ungauged Basin: A Case Study in Gokirmak and Kocanaz, Turkey. Arabian Journal of Geosciences, 10(15), 331.

Briaud, J. L., Gardoni, P. & Yao, C. (2012). Bridge Scour Risk. In Proceedings of the 6th International Conference on Scour and Erosion. Paris, France.

Chen, Y., Shi, P., Ji, X., Qu, S., Zhao, L., & Dong, F. (2019). New Method to Calculate the Dynamic Factor–Flow Velocity in Geomorphologic Instantaneous Unit Hydrograph. Scientific Reports, 9(1), 14201.

Ghumman, A. R., Al-Salamah, I. S., Alsaleem, S. S., & Haider, H. (2017). Evaluating the Impact of Lower Resolutions of Digital Elevation Model on Rainfall-Runoff Modeling for Ungauged Catchments. Environmental Monitoring and Assessment, 189(2), 54.

Gupta, V., Waymire, E., & Wang, C. (1980). A Representation of an Instantaneous Unit Hydrograph From Geomorphology. Water Resources Research, 16(5), 855–862.

HEC (Hydrologic Engineering Centre). (2010). HECRAS River Analysis System. HEC. U.S. 790 p.

Hosseini, S. M., Mahjouri, N., & Riahi, S. (2016). Development of a Direct Geomorphologic IUH Model for Daily Runoff Estimation in Ungauged Watersheds. Journal of Hydrologic Engineering, 21(6), 05016008.

Johnson, P. A. & Whittington, R. M. (2011). Vulnerability-Based Risk Assessment for Stream Instability at Bridges. Journal of Hydraulic Engineering, 137(10), 1248–1256.

Johnson, P. A., & Niezgoda, S. L. (2004). Risk-Based Method for Selecting Bridge Scour Countermeasures. Journal of Hydraulic Engineering, 130(2), 121–128.

Kumar, R., Chatterjee, C., Singh, R. D., Lohani, A. K., & Kumar S. (2007). Runoff Estimation for an Ungauged Catchment Using Geomorphological Instantaneous Unit Hydrograph (GIUH) Models. Hydrological Processes, 21(14), 1829–1840.

Lagasse, P. F., Clopper, P. E., Zevenbergen, L. W., & Girard, L. G. (2007). Countermeasures to protect bridge piers from scour. National Cooperative Highway Research Program Rep. No. 593. Transportation Research Board of the National Academies, Washington, DC.

Malik, A., Kumar, A., Kushwaha, D. P., Kisi, O., Salih, S. Q., Al-Ansari, N., & Yaseen, Z. M. (2019). The Implementation of a Hybrid Model for Hilly Sub-Watershed Prioritization Using Morphometric Variables: Case Study in India. Water, 11, 1138.

Nemes, G. (2010). New Asymptotic Expansion for the Gamma Function. Archiv der Mathematik, 95(2), 161–169.

Ozdemir, C. E. (2003). A Feasibility Study on Bridge Scour Countermeasures (Dissertation, Middle East Technical University-Ankara).

Pearson, D., Stein, S., & Jones, J. S. (2002). HYRISK Methodology and User Guide Federal Highway Administration Rep. No. FHWA-RD-02-XXX. Federal Highway Administration, Washington, DC.

Rodriguez-Iturbe, I., & Valdes, J. (1979). The Geomorphologic Structure of Hydrologic Response. Water Resources Research, 15(6), 1409–1420.

Rodriguez-Iturbe, I ., G onzalez-Sanabria, M ., & B ras, R . ( 1982). A Geomorphoclimatic Theory of the Instantaneous Unit Hydrograph. Water Resources Research, 18(4), 877–886.

Rosso, R. (1984). Nash Model Relation to Horton Order Ratios. Water Resources Research, 20(7), 914–920.

Sahoo, B., Chatterjee, C., Raghuwanshi, N. S., Singh, R., & Kumar, R. (2006). Flood Estimation by GIUH Based Clark and Nash Models. Journal of Hydrologic Engineering, 11(6), 515–525.

Strahler, A. N. (1957). Quantitative Analysis of Watershed Geomorphology. Transactions American Geophysical Union, 38(6), 913–920.

Yanmaz, A. M., & Apaydin, M. (2012). Bridge Scour Risk Assessment and Countermeasure Design. Journal of Performance of Constructed Facilities, 26(4), 499–506.

Zhang, H. L., Wang, Y. J., Wang, Y. Q., Li, D. X., & Wang, X. K. (2013). The Effect of Watershed Scale on HEC-HMS Calibrated Parameters: A Case Study in the Clear Creek Watershed in Iowa, US. Hydrology and Earth System Sciences, 17, 2735–2745.

DOI: 10.7250/bjrbe.2021-16.514


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