Effect of Sediment Feeding on Live-Bed Scour around Circular Bridge Piers
The effect of sediment feeding was investigated in the case of live-bed scour around circular bridge piers under flood waves to provide contributions for future experimental procedures. Circular piers of three different diameters were tested in a long rectangular flume containing uniform sediment layer 25 cm thick, by generating 7 different triangular hydrographs with different durations ranging between 6 and 20 minutes and the peak discharges varying from 18 to 38 L/s. Experiments were first conducted without sediment feeding and total load was collected at predetermined time intervals. Then the same experiments were performed by feeding with the same amount of collected sediment. Time dependent scour depths were measured using UVP. Bed degradation was also determined by using an empirical equation existing in the literature. It was found that feeding with the rates equal to the transported ones did not significantly change the scour depth and total sediment load within the limits of the experiments. No significant bed degradation was observed, except at the upstream end. It was revealed that the sediment feeding may not be required in the experiments where temporal evolution of the scour depth is studied in a sufficiently long flume containing sufficient sediment.
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Laursen, Emmett M., Toch, Arthur. Scour around bridge piers and abutments. Vol. 4. Ames, IA: Iowa Highway Research Board, (1956).
Jain, Subhash C., Fischer, Edward E. Scour around circular bridge piers at high Froude numbers (No. FHWA-RD-79-104 Final Rpt.), (1979).
Chiew, Yee-Meng. Local scour at bridge piers (Doctoral dissertation, ResearchSpace@ Auckland), (1984).
Kothyari, U. C., K. G. Ranga Raju, and R. J. Garde. “Live-Bed Scour around Cylindrical Bridge Piers.” Journal of Hydraulic Research 30, no. 5 (September 1992): 701–715. doi:10.1080/00221689209498889.
Melville, Bruce W. “Live‐bed Scour at Bridge Piers.” Journal of Hydraulic Engineering 110, no. 9 (September 1984): 1234–1247. doi:10.1061/(asce)0733-9429(1984)110:9(1234).
Sheppard, D. Max, and William Miller. “Live-Bed Local Pier Scour Experiments.” Journal of Hydraulic Engineering 132, no. 7 (July 2006): 635–642. doi:10.1061/(asce)0733-9429(2006)132:7(635).
Yanmaz, Ali M. “Köprü Hidroliği” METU Press, (October, 2002)
Marion, Andrea, Matteo Tregnaghi, and Simon Tait. “Sediment Supply and Local Scouring at Bed Sills in High-Gradient Streams.” Water Resources Research 42, no. 6 (June 2006). doi:10.1029/2005wr004124.
Singer, Michael Bliss. “Downstream Patterns of Bed Material Grain Size in a Large, Lowland Alluvial River Subject to Low Sediment Supply.” Water Resources Research 44, no. 12 (December 2008). doi:10.1029/2008wr007183.
Ferrer-Boix, Carles, and Marwan A. Hassan. “Influence of the Sediment Supply Texture on Morphological Adjustments in Gravel-Bed Rivers.” Water Resources Research 50, no. 11 (November 2014): 8868–8890. doi:10.1002/2013wr015117.
Pfeiffer, Allison M., Noah J. Finnegan, and Jane K. Willenbring. “Sediment Supply Controls Equilibrium Channel Geometry in Gravel Rivers.” Proceedings of the National Academy of Sciences 114, no. 13 (March 13, 2017): 3346–3351. doi:10.1073/pnas.1612907114.
Hong, Jian-Hao, Yee-Meng Chiew, Po-Hung Yeh, and Hsun-Chuan Chan. “Evolution of Local Pier-Scour Depth with Dune Migration in Subcritical Flow Conditions.” Journal of Hydraulic Engineering 143, no. 4 (April 2017): 04016098. doi:10.1061/(asce)hy.1943-7900.0001261.
Wang, Le, Alan Cuthbertson, Gareth Pender, and Deyu Zhong. “Bed Load Sediment Transport and Morphological Evolution in a Degrading Uniform Sediment Channel under Unsteady Flow Hydrographs.” Water Resources Research 55, no. 7 (July 2019): 5431–5452. doi:10.1029/2018wr024413.
Gumgum, Firat, and Mehmet Sukru Guney. “Time Dependent Live-Bed Scour Around Circular Piers under Flood Waves.” Periodica Polytechnica Civil Engineering (January 1, 2020). doi:10.3311/ppci.14664.
Guney, M. Sukru, Gokcen Bombar, Aysegul O. Aksoy, and Mustafa Dogan. “Use of UVP to Investigate the Evolution of Bed Configuration.” KSCE Journal of Civil Engineering 17, no. 5 (June 28, 2013): 1188–1197. doi:10.1007/s12205-013-0131-5.
Melville, Bruce W., and Yee-Meng Chiew. “Time Scale for Local Scour at Bridge Piers.” Journal of Hydraulic Engineering 125, no. 1 (January 1999): 59–65. doi:10.1061/(asce)0733-9429(1999)125:1(59).
Melville, Bruce W. “Pier and Abutment Scour: Integrated Approach.” Journal of Hydraulic Engineering 123, no. 2 (February 1997): 125–136. doi:10.1061/(asce)0733-9429(1997)123:2(125).
Yen, Chin-lien, and Kwan Tun Lee. “Bed Topography and Sediment Sorting in Channel Bend with Unsteady Flow.” Journal of Hydraulic Engineering 121, no. 8 (August 1995): 591–599. doi:10.1061/(asce)0733-9429(1995)121:8(591).
Lee, Kwan Tun, Yi-Liang Liu, and Kai-Hung Cheng. “Experimental Investigation of Bedload Transport Processes Under Unsteady Flow Conditions.” Hydrological Processes 18, no. 13 (August 27, 2004): 2439–2454. doi:10.1002/hyp.1473.
Bombar, Gökçen, Şebnem Elçi, Gokmen Tayfur, M. Şükrü Güney, and Aslı Bor. “Experimental and Numerical Investigation of Bed-Load Transport Under Unsteady Flows.” Journal of Hydraulic Engineering 137, no. 10 (October 2011): 1276–1282. doi:10.1061/(asce)hy.1943-7900.0000412.
Graf, W. H., Suszka, L. “Unsteady flow and its effect on sediment transport.” 21st IAHR Congress, (1985).
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