New Approach to Predicting Local Scour Downstream of Grade-Control Structure
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Volume 146, Issue 2
Abstract
Despite the numerous studies on scouring processes, the prediction of scour-hole dimensions downstream of hydraulic structures remains challenging because of the complexity of the phenomenon and its dynamic sensitivity to structure and sediment properties. This study experimentally focuses on scour-hole development downstream of a sloped grade-control structure (GCS) in alluvial channels. A large series of laboratory experiments were carried out in a rectangular channel with a noncohesive sediment bed. Based on the data from this study and data collected from previous studies, the effect of the downstream face slope of a GCS on scour morphology was analyzed. In this regard, it was found that the face slope has an effect only if it is smaller than the slope of the upstream equilibrium scour side obtained with a GCS of a vertical downstream face. Before reaching an equilibrium state, the scour process evolves into three distinct phases, a very rapid initial phase, an intermediate gradual phase, and an equilibrium phase. A general empirical expression for predicting temporal scour evolution is proposed and extended to different types of GCS. Moreover, a new scaling approach is proposed that leads to the derivation of new equations predicting equilibrium scour profiles with different entering jet-flow typologies. To make these equations operational, a series of estimating expressions for the characteristic lengths of equilibrium scour holes is also proposed.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
The experiments were carried out at the Hydraulic Laboratory of the Mediterranean Agronomic Institute of Bari (Italy).
References
Adduce, C., and G. Sciortino. 2006. “Scour due to a horizontal turbulent jet: Numerical and experimental investigation.” J. Hydraul. Res. 44 (5): 663–673. https://doi.org/10.1080/00221686.2006.9521715.
Balachandar, R., and J. A. Kells. 1997. “Local channel in scour in uniformly graded sediments: The time-scale problem.” Can. J. Civ. Eng. 24 (5): 799–807. https://doi.org/10.1139/l97-034.
Ben Meftah, M., and M. Mossa. 2006. “Scour holes downstream of bed sills in low-gradient channels.” J. Hydraul. Res. 44 (4): 497–509. https://doi.org/10.1080/00221686.2006.9521701.
Bormann, N. E., and P. Y. Julien. 1991. “Scour downstream of grade-control structures.” J. Hydraul. Eng. 117 (5): 579–594. https://doi.org/10.1061/(ASCE)0733-9429(1991)117:5(579).
Carstens, M. R. 1966. “Similarity laws for localized scour.” J. Hydraul. Div. 92 (3): 13–36.
Chen, J., H. Hsu, and Y. Hong. 2016. “The influence of upstream slope on the local scour at drop structure.” J. Mt. Sci. 13 (12): 2237–2248. https://doi.org/10.1007/s11629-015-3790-5.
D’Agostino, V., and V. Ferro. 2004. “Scour on alluvial bed downstream of grade-control structures.” J. Hydraul. Eng. 130 (1): 24–37. https://doi.org/10.1061/(ASCE)0733-9429(2004)130:1(24).
Espa, P., and S. Sibilla. 2014. “Experimental study of the scour regimes downstream of an apron for intermediate tailwater depths.” J. Appl. Fluid Mech. 7 (4): 611–624. https://doi.org/10.1201/9781439833865.ch185.
Fakhari, Z., and A. Kabiri-Samani. 2017. “Scour in the transition from super- to subcritical flow without a hydraulic jump.” J. Hydraul. Res. 55 (4): 470–479. https://doi.org/10.1080/00221686.2016.1275052.
Farhoudi, J., and H. K. Shayan. 2014. “Investigation on local scour downstream of adverse stilling basins.” Ain Shams Eng. J. 5 (2): 361–375. https://doi.org/10.1016/j.asej.2014.01.002.
Gaudio, R., A. Marion, and V. Bovolin. 2000. “Morphological effects of bed sills in degrading rivers.” J. Hydraul. Res. 38 (2): 89–96. https://doi.org/10.1080/00221680009498344.
Ghodsian, M., M. Mehraein, and H. R. Ranjbar. 2012. “Local scour due to free fall jets in non-uniform sediment.” Sci. Iranica 19 (6): 1437–1444. https://doi.org/10.1016/j.scient.2012.10.008.
Guan, D., B. Melville, and H. Friedrich. 2016. “Local scour at submerged weirs in sand-bed channels.” J. Hydraul. Res. 54 (2): 172–184. https://doi.org/10.1080/00221686.2015.1132275.
Guan, D., B. W. Melville, and H. Friedrich. 2014. “Flow patterns and turbulence structures in a scour hole downstream of a submerged weir.” J. Hydraul. Eng. 140 (1): 68–76. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000803.
Guven, A., and M. Gunal. 2008. “Prediction of scour sownstream of grade-control structures using neural networks.” J. Hydraul. Eng. 134 (11): 1656–1660. https://doi.org/10.1061/(ASCE)0733-9429(2008)134:11(1656).
Heng, S., T. Tingsanchali, and T. Suetsugi. 2013. “Prediction formulas of maximum scour depth and impact location of a local scour hole below a chute spillway with a flip bucket.” WIT Trans. Ecol. Environ. 172 (May): 251–262. https://doi.org/10.2495/RBM130211.
Hill, D. F., and B. D. Younkin. 2006. “PIV measurements of flow in and around scour holes.” Exp. Fluids 41 (2): 295–307. https://doi.org/10.1007/s00348-006-0156-3.
Hopfinger, E. J., A. Kurniawan, W. H. Graf, and U. Lemmin. 2004. “Sediment erosion by Görtler vortices: The scour-hole problem.” J. Fluid Mech. 520 (12): 327–342. https://doi.org/10.1017/S0022112004001636.
Kuhnle, R. A., C. V. Alonso, and F. D. Shields. 2002. “Local scour associated with angled spur dikes.” J. Hydraul. Eng. 128 (12): 1087–1093. https://doi.org/10.1061/(ASCE)0733-9429(2002)128:12(1087).
Laursen, E. M. 1952. Observations on the nature of scour.” In Proc., 5th Hydraulic Conf., Bulletin, 179–197. Iowa City, IA: Univ. of Iowa.
Lenzi, M. A., A. Marion, and F. Comiti. 2003. “Local scouring at grade-control structures in alluvial mountain rivers.” Water Resour. Res. 39 (7): 1176. https://doi.org/10.1029/2002WR001815.
Lu, J. Y., J. H. Hong, K. P. Chang, and T. F. Lu. 2013. “Evolution of scouring process downstream of grade-control structures under steady and unsteady flows.” Hydrol. Processes 27 (19): 2699–2709. https://doi.org/10.1002/hyp.9318.
Martins, R. 1975. “Scouring of rocky river beds and free-jet spillways.” Int. Water Power Dam Constr. 27 (5): 152–153.
Mason, P. J., and K. Arumugam. 1985. “Free jet scour below dams and flip buckets.” J. Hydraul. Eng. 111 (2): 220–235. https://doi.org/10.1061/(ASCE)0733-9429(1985)111:2(220).
Mossa, M. 1998. “Experimental study on the scour downstream of grade-control structures.” In Proc., Conf., 26th Convegno di Idraulica e Costruzioni Idrauliche, 581–594. Catania, Italy: Cooperativa Universitaria Editrice Catanese di Magistero.
Nasrollahi, A., M. Ghodsian, and S. A. A. S. Neyshabouri. 2008. “Local scour at permeable spur dikes.” J. Appl. Sci. 8 (19): 3398–3406. https://doi.org/10.3923/jas.2008.3398.3406.
Pagliara, S., M. Amidei, and W. H. Hager. 2008a. “Hydraulics of 3D plunge pool scour.” J. Hydraul. Eng. 134 (9): 1275–1284. https://doi.org/10.1061/(ASCE)0733-9429(2008)134:9(1275).
Pagliara, S., W. H. Hager, and J. Unger. 2008b. “Temporal evolution of plunge pool scour.” J. Hydraul. Eng. 134 (11): 1630–1638. https://doi.org/10.1061/(ASCE)0733-9429(2008)134:11(1630).
Pagliara, S., and M. Palermo. 2013. “Rock grade control structures and stepped gabion weirs: Scour analysis and flow features.” Acta Geophys. 61 (1): 126–150. https://doi.org/10.2478/s11600-012-0066-0.
Pagliara, S., M. Palermo, and I. Carnacina. 2011. “Expanding pools morphology in live-bed conditions.” Acta Geophys. 59 (2): 296–316. https://doi.org/10.2478/s11600-010-0048-z.
Papanicolaou, A. N., F. Bressan, J. Fox, C. Kramer, and L. Kjos. 2018. “Role of structure submergence on scour evolution in gravel bed rivers: Application to slope-crested structures.” J. Hydraul. Eng. 144 (2): 02017001. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001447.
Schoklitsch, A. 1932. Kolkbidung unter Uberfallstrahlen, 343. Germany: Wasserwirtschaft.
Scurlock, S. M., C. I. Thornton, and S. R. Abt. 2012. “Equilibrium scour downstream of three-dimensional grade-control structures.” J. Hydraul. Eng. 138 (2): 167–176. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000493.
Shafai-Bejestan, M., S. M. R. Nabavi, and S. Dey. 2016. “Scour downstream of grade control structures under the influence of upward seepage.” Acta Geophys. 64 (3): 694–710. https://doi.org/10.1515/acgeo-2016-0024.
Tregnaghi, M., A. Marion, and R. Gaudio. 2007. “Affinity and similarity of local scour holes at bed sills.” Water Resour. Res. 43 (11): W11417. https://doi.org/10.1029/2006WR005559.
Veronese, A. 1937. “Erosioni di fondo a valle di uno scarico.” Ann. Lav. Public. 75 (9): 717–726.
Wang, L., B. W. Melville, D. Guan, and C. N. Whittaker. 2018. “Local scour at downstream sloped submerged weirs.” J. Hydraul. Eng. 144 (8): 04018044. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001492.
Yang, S. Q., S. K. Tan, and X. K. Wang. 2012. “Mechanism of secondary currents in open channel flows.” J. Geophys. Res. Earth Surf. 117 (4): 1–13. https://doi.org/10.1029/2012JF002510.
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Published In
Journal of Hydraulic Engineering
Volume 146 • Issue 2 • February 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Nov 1, 2018
Accepted: Apr 17, 2019
Published online: Dec 4, 2019
Published in print: Feb 1, 2020
Discussion open until: May 4, 2020
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