Abstract
Bridge failure, due to local scour at bridge pier foundations, has become a critical issue in river and bridge engineering, which might lead to transportation disruption, loss of lives and economic problems. A practical solution to prevent bridge collapses is the implementation of scour mitigation methods around bridge foundations. Based on an experimental perspective, this study is focused on the influence of the size and position of circular collars from the sediment bed on scour depth at two tandem piers. To meet this end, long-lasting experiments are performed under clear-water conditions using uniform sand for bed materials. Compared to the adjacent position of the collar on the bed, placing the collars below the bed would increase the delay time of scour at the piers up to four times. However, regardless of the delay time, the observations indicate that locating the collars on the initial bed surface results in maximum reduction in scour depths around the piers. It was found that diminishing the flow intensity has a dramatic impact on the scour reduction at the piers, so that maximum reduction in scour depths at piers increased on average from 20 to 70% with the reduction in the flow intensity from 0.95 to 0.9.
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Abbreviations
- \(B\) :
-
Width of the channel
- \(D\) :
-
Pier diameter
- \(D^{*}\) :
-
Equivalent pier width
- \(D_{\text{proj}}\) :
-
Sum of the non-overlapping projected width of the piers onto a plane normal to the flow direction
- \(d_{\text{s}}\) :
-
Depth of scour
- \(d_{\text{se}}\) :
-
Equilibrium depth of scour
- \(d_{{{\text{s}}({\text{ext}})}}\) :
-
Extrapolated depth of scour to an infinite time
- \(d_{50}\) :
-
Median sediment grain size
- \(g\) :
-
Acceleration of gravity
- \(h\) :
-
Upstream flow depth
- \(H_{\text{c}}\) :
-
Collar height from the sediment bed
- \(K_{m}\) :
-
Number of aligned rows factor
- \(K_{\text{sp}}\) :
-
Factor for the distance between the piers
- \(R\) :
-
Reduction in scour depth
- \(R_{\text{u}}\) :
-
Reduction in scour depth at the upstream pier
- \(R_{\text{d}}\) :
-
Reduction in scour depth at the downstream pier
- \(R_{\text{p}} = UD/\vartheta\) :
-
Pier Reynolds number
- \(s\) :
-
Center-to-center spacing of the piers
- \(U\) :
-
Mean upstream flow velocity
- \(U_{\text{c}}\) :
-
Mean threshold velocity
- \(u_{\text{c}}^{*}\) :
-
Shear critical velocity
- \(T\) :
-
Dimensionless time of scour
- \(t\) :
-
Time of scour
- \(t_{\text{c}}\) :
-
Thickness of the collar
- \(t_{\text{d}}\) :
-
Delay time of scour
- \(t_{\text{e}}\) :
-
Equilibrium time of scour
- \(w_{\text{c}}\) :
-
Width of the collar
- \(Z\) :
-
Dimensionless scour depth
- \(\Delta = \rho_{\text{s}}^{{\prime }} /\rho\) :
-
Relative submerged sediment density
- \(\vartheta\) :
-
Fluid kinematic viscosity
- \(\rho\) :
-
Density of fluid
- \(\rho_{\text{s}}\) :
-
Sediment grain density
- \(\rho_{\text{s}}^{{\prime }}\) :
-
Submerged sediment density
- \(\sigma_{\text{g}}\) :
-
Geometric standard deviation of the sediment grain size distribution
- \(\varphi\) :
-
Function
References
Amini A, Asadi Parto A (2017) 3D numerical simulation of flow field around twin piles. Acta Geophys 65(6):1243–1251. https://doi.org/10.1007/s11600-017-0094-x
Arneson PF, Zevenbergen LA, Lagasse LW (2012) Evaluating scour at bridges. Hydraulic engineering circular no. 18 (HEC-18) (report no. FHWA NHI 01-001). Federal Highway Administration, Washington, DC
Ataie-Ashtiani B, Beheshti AA (2006) Experimental investigation of clear-water local scour at pile groups. J Hydraul Eng 132(10):1100–1104. https://doi.org/10.1061/(ASCE)0733-9429(2006)132:10(1100)
Chabert J, Engeldinger P (1956) Study of scour around bridge piers. Report prepared for the Laboratoire National d’Hydraulique
Chen SC, Tfwala S, Wu TY, Chan HC, Chou HT (2018) A hooked-collar for bridge piers protection: flow fields and scour. Water 10(9):1251. https://doi.org/10.3390/w10091251
Chiew YM (1984) Local scour at bridge piers. Doctoral dissertation, University of Auckland
Dey S (1997a) Local scour at piers, part I: a review of developments of research. Int J Sediment Res 12(2):23–46
Dey S (1997b) Local scour at piers, part II: bibliography. Int J Sediment Res 12(2):47–57
Dey S (2014) Fluvial hydrodynamics. Springer, Berlin
Dey S, Bose SK, Sastry GLN (1995) Clear water scour at circular piers: a model. J Hydraul Eng 121:869–876. https://doi.org/10.1061/(ASCE)0733-9429(1995)121:12(869)
Ettema R (1980) Scour at bridge piers. Report no. 216. University of Auckland, Auckland, New Zealand
Ettema R, Nakato T, Muste MVI (2006) An illustrated guide for monitoring and protecting bridge waterways against scour (No. Project TR-515). IIHR-Hydroscience & Engineering, University of Iowa
Guo J, Suaznabar O, Shan H, Shen J (2012) Pier scour in clear-water conditions with non-uniform bed materials (No. FHWA-HRT-12-022). Turner-Fairbank Highway Research Center, McLean
Hannah CR (1978) Scour at pile groups. Report no. 78-3. Canterbury University, Canterbury, New Zealand
Heidarpour M, Afzalimehr H, Izadinia E (2010) Reduction of local scour around bridge pier groups using collars. Int J Sediment Res 25(4):411–422. https://doi.org/10.1016/S1001-6279(11)60008-5
Houwing EJ, Van Rijn LC (1998) In situ erosion flume (ISEF): determination of bed-shear stress and erosion of a kaolinite bed. J Sea Res 39(3–4):243–253
Johnson PA, Hey RD, Brown ER, Rosgen DL (2002) Stream restoration in the vicinity of bridges. J Am Water Resour Assoc 38(1):55–67. https://doi.org/10.1111/j.1752-1688.2002.tb01534.x
Karimaei Tabarestani M, Zarrati AR (2019) Local scour depth at a bridge pier protected by a collar in steady and unsteady flow. In: Proceedings of the Institution of Civil Engineers—water management. Thomas Telford Ltd, London, pp 1–11. https://doi.org/10.1680/jwama.18.00061
Keshavarzi A, Shrestha CK, Melville BW, Khabbaz H, Ranjbar-Zahedani M, Ball J (2018) Estimation of maximum scour depths at upstream of front and rear piers for two tandem circular columns. Environ Fluid Mech 18(2):537–550. https://doi.org/10.1007/s10652-017-9572-6
Khaple S, Hanmaiahgari PR, Gaudio R, Dey S (2017a) Splitter plate as a flow-altering pier scour countermeasure. Acta Geophys 65(5):957–975. https://doi.org/10.1007/s11600-017-0084-z
Khaple S, Hanmaiahgari PR, Gaudio R, Dey S (2017b) Interference of an upstream pier on local scour at downstream piers. Acta Geophys 65(1):29–46. https://doi.org/10.1007/s11600-017-0004-2
Khodashenas SR, Shariati H, Esmaeeli K (2018) Comparison between the circular and square collar in reduction of local scouring around bridge piers. In: E3S web of conferences. EDP sciences, vol 40, p 03002
Kim HS, Nabi M, Kimura I, Shimizu Y (2014) Numerical investigation of local scour at two adjacent cylinders. Adv Water Resour 70:131–147. https://doi.org/10.1016/j.advwatres.2014.04.018
Kumar V, Raju KGR, Vittal N (1999) Reduction of local scour around bridge piers using slots and collars. J Hydraul Eng 125(12):1302–1305. https://doi.org/10.1061/(ASCE)0733-9429(1999)125:12(1302)
Lança R, Fael C, Cardoso A (2010) Assessing equilibrium clear water scour around single cylindrical piers. In: Proceedings of the international conference on fluvial hydraulic (river flow), Braunschweig, Germany, September 8–10
Lança R, Fael C, Maia R, Pêgo JP, Cardoso AH (2013) Clear-water scour at pile groups. J Hydraul Eng 139(10):1089–1098. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000770
Lança RMM, Simarro G, Fael CMS, Cardoso AH (2015) Effect of viscosity on the equilibrium scour depth at single cylindrical piers. J Hydraul Eng 142(3):06015022. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001102
Masjedi A, Bejestan MS, Esfandi A (2010) Experimental study on local scour around single oblong pier fitted with a collar in a 180 degree channel bend. Int J Sediment Res 25(3):304–312. https://doi.org/10.1016/S1001-6279(10)60047-9
Melville BW (1984) Live-bed scour at bridge piers. J Hydraul Eng 110(9):1234–1247. https://doi.org/10.1061/(ASCE)0733-9429(1984)110:9(1234)
Melville BW, Chiew YM (1999) Time scale for local scour at bridge piers. J Hydraul Eng 114(10):1210–1226. https://doi.org/10.1061/(ASCE)0733-9429(1999)125:1(59)
Melville BW, Sutherland AJ (1988) Design method for local scour at bridge piers. J Hydraul Eng 114(10):1210–1226. https://doi.org/10.1061/(ASCE)0733-9429(1988)114:10(1210)
Memar S, Zounemat-Kermani M, Beheshti A, De Cesare G, Schleiss AJ (2018) Investigation of local scour around tandem piers for different skew-angles. In: International conference on fluvial hydraulics (river flow), Lyon-Villerurbanne, France, September 5–8
Moncada-M AT, Aguirre-Pe J, Bolivar JC, Flores EJ (2009) Scour protection of circular bridge piers with collars and slots. J Hydraul Res 47(1):119–126. https://doi.org/10.3826/jhr.2009.3244
Monti R (1994) Indagine sperimentale delle caratteristiche fluidodinamiche del campo di moto intorno ad una pila circolare. Tesi di Dottorato di Ricerca, Politecnico di Milano, Milan, Italy (in Italian)
Moreno M, Maia R, Couto L (2015) Effects of relative column width and pile-cap elevation on local scour depth around complex piers. J Hydraul Eng 142(2):04015051. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001080
Oliveto G, Hager WH (2002) temporal evolution of clear-water pier and abutment scour. J Hydraul Eng 128(9):811–820. https://doi.org/10.1061/(ASCE)0733-9429(2002)128:9(811)
Oliveto G, Hager WH (2005) Further results to time-dependent local scour at bridge elements. J Hydraul Eng 131(2):97–105. https://doi.org/10.1061/(ASCE)0733-9429(2005)131:2(97)
Pang ALJ, Skote M, Lim SY, Gullman-Strand J, Morgan N (2016) A numerical approach for determining equilibrium scour depth around a mono-pile due to steady currents. Appl Ocean Res 57:114–124. https://doi.org/10.1016/j.apor.2016.02.010
Raudkivi AJ (1986) Functional trends of scour at bridge piers. J Hydraul Eng 112(1):1–13. https://doi.org/10.1061/(ASCE)0733-9429(1986)112:1(1)
Selamoglu M, Yanmaz AM, Koken M (2014) Temporal variation of scouring topography around dual bridge piers. In: Proceedings of the seventh international conference on scour and erosion, Perth, Western Australia
Shen HW, Schneider VR, Karaki SS (1966) Mechanics of local scour. Report no. CER66HWS10. Colorado State University, Fort Collins, CO
Sheppard DM, Miller W Jr (2006) Live-bed local pier scour experiments. J Hydraul Eng 132(7):635–642
Sheppard DM, Melville B, Demir H (2013) Evaluation of existing equations for local scour at bridge piers. J Hydraul Eng 140(1):14–23. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000800
Tafarojnoruz A, Gaudio R, Grimaldi C, Calomino F (2010) Required conditions to achieve the maximum local scour depth at a circular pier. In: Proceeding XXXII Convegno Nazionale di Idraulica e Costruzioni Idrauliche, 14–17 September, Palermo, Italy, Farina, Palermo
Tafarojnoruz A, Gaudio R, Calomino F (2012) Evaluation of flow-altering countermeasures against bridge pier scour. J Hydraul Eng 138(3):297–305. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000512
Tanaka S, Yano M (1967) Local scour around a circular cylinder. In: Proceeding of 12th IAHR congress. International Association for Hydraulic Research, Delft, Netherlands
Wang H, Tang H, Liu Q, Wang Y (2016) Local scouring around twin bridge piers in open-channel flows. J Hydraul Eng 142(9):06016008. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001154
Zarrati AR, Gholami H, Mashahir MB (2004) Application of collar to control scouring around rectangular bridge piers. J Hydraul Res 42(1):97–103. https://doi.org/10.1080/00221686.2004.9641188
Zarrati AR, Nazariha M, Mashahir MB (2006) Reduction of local scour in the vicinity of bridge pier groups using collars and riprap. J Hydraul Eng 132(2):154–162. https://doi.org/10.1061/(ASCE)0733-9429(2006)132:2(154)
Zokaei M, Zarrati AR, Salamatian SA, Tabarestani MK (2013) Study on scouring around bridge piers protected by collar using low density sediment. Int J Civ Eng 11(3A):199–205
Zounemat-Kermani M, Beheshti AA, Ataie-Ashtiani B, Sabbagh-Yazdi SR (2009) Estimation of current-induced scour depth around pile groups using neural network and adaptive neuro-fuzzy inference system. Appl Soft Comput 9(2):746–755. https://doi.org/10.1016/j.asoc.2008.09.006
Acknowledgements
This experimental research was conducted at Laboratory of Hydraulic Constructions (LCH-EPFL), Lausanne, Switzerland, which supported the project financially as well.
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Memar, S., Zounemat-Kermani, M., Beheshti, A. et al. Influence of collars on reduction in scour depth at two piers in a tandem configuration. Acta Geophys. 68, 229–242 (2020). https://doi.org/10.1007/s11600-019-00393-0
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DOI: https://doi.org/10.1007/s11600-019-00393-0