Journal of Hydraulic Structures

Journal of Hydraulic Structures

Laboratory study of scouring around the roughened pile groups in the presence of material harvesting pits and at different Froude numbers

Document Type : Research Paper

Authors
Maryam Sattariyan
Rasoul Daneshfaraz
Babak Alinejad
Mahdi Majedi-Asl
Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, East Azerbaijan, Iran.
10.22055/jhs.2023.41915.1231
Abstract
Harvesting the river materials can cause negative effects on the river and can intensify scouring around the bridge piers. This study investigates local scouring around roughened pile groups with gravel in the presence of harvesting pits for Froude numbers of 0.1, 0.25 and 0.5. It was found that applying roughness reduced the scour depth by 4.8 cm (73%). Due to increasing pile stability because of reducing local scouring, results show that the application of roughness to the surface of piers is a suitable, straightforward, cost-effective, and easy-to-apply method to reduce scouring. In addition, the maximum scour depth upstream and downstream of the harvesting pit occurred upstream of the initial piers. A comparison of scour areas shows that scour expansion in the transverse direction was greater than in the longitudinal direction and the amount of expansion increases when Froude number has been increased. Also, the extent of scouring around the initial piers was greater than the extent of scouring around the other piers. The maximum scour depth was 15 cm in front of the first pier and corresponded to simple piers and flow with a Froude number of 0.5.
Keywords
Local scouring
bridge pile groups
Harvesting river materials
roughened pile groups
  1. Bozkuş Z, Özalp M C and Dinçer A E (2018). Effect of pier inclination angle on local scour depth around bridge pier groups. Arabian Journal for Science and Engineering. 43(10), 5413-5421.
  2. Zhao G and Sheppard D M (1999). The effect of flow skew angle on sediment scour near pile groups. In Stream Stability and Scour at Highway Bridges: Compendium of Stream Stability and Scour Papers Presented at Conferences Sponsored by the Water Resources Engineering (Hydraulics) Division of the American Society of Civil Engineers. pp. 377-391.
  3. Ataei-Ashtiani B and Beheshti A A (2006). Experimental investigation of clear- water local scour at pile groups. Journal of Hydraulic Engineering, ASCE 132(10), 1100-1104.
  4. Liang F, Wang C, Huang M and Wang Y (2017). Experimental observations and evaluations of formulae for local scour at pile groups in steady currents. Marine Geo resources and Geo technology, 35(2), 245-255.
  5. Solaimani N, Amini A, Banejad H and Taherei Ghazvinei P (2017). The effect of pile spacing and arrangement on bed formation and scour hole dimensions in pile groups. International Journal of River Basin Management, 15(2), 219-225.‏
  6. Vaghefi M, Motlagh M J T N, Hashemi S S and Moradi, S (2018). Experimental study of bed topography variations due to placement of a triad series of vertical piers at different positions in a 180 bend. Arabian Journal of Geosciences, 11(5), 102.
  7. Malik R, and Setia B (2020). Interference between pier models and its effects on scour depth. SN Applied Sciences, 2(1), 68.
  8. Yang Y, Qi M, Wang X and Li J (2020). Experimental study of scour around pile groups in steady flows. Ocean Engineering, 195, 106651.
  9. QI Mei-lan (2005). Riverbed Scouring around Bridge Piers in River Section Sand Pits. Journal of Hydraulic Engineering. 36 (7): 835-839. (in Chinese)
  10. Rezaie M, Daneshfaraz R and Dasineh M (2018). Experimental Investigation of Adding Clay and PAM on Scour Reduction Bridge Piers under the influence Removal of River materials. Journal of Hydraulics, 13(3), 59-70. (In Persian)
  11. Daneshfaraz R, Chabokpour J, Dasineh M and Ghaderi A (2019 a). The experimental study of the effects of river mining holes on the bridge piers. Iranian Journal of Soil and Water Research, 50(7), 1619-1633. (In Persian)
  12. Daneshfaraz R, Chabokpour J and Dasineh M (2019 b). The experimental investigation of the maximum depth and length of the created pit holes due to the bed material removal under subcritical flow condition. Journal of Water and Soil Conservation, 26(1), 111-130. (In Persian)
  13. Majedi Asl M, Daneshfaraz R and Valizadeh S (2019). Experimental Investigation of the River Materials Mining Effect on the Scouring Around Armed Pier Groups. Iranian Journal of Soil and Water Research, 50(6), 1363-1380. (In Persian)
  14. Majedi-Asl M, Daneshfaraz R, Abraham J P and Valizadeh S (2020). Effects of hydraulic characteristics, sedimentary parameters, and mining of bed material on scour depth of bridge pier groups. Journal of hydraulic engineering.
  15. Daneshfaraz, R., Sattariyan, K. M., Alinejad, B., & Majedi, A. M. (2021). Experimental Investigation of the Effects of Flow Discharge on the Scour Rate around the Groups of Bridge Piers with a Rough Surface in the Presence of Aggregate Extraction Pits.
  16. Daneshfaraz, R., Ghaderi, A., Sattariyan, M., Alinejad, B., Asl, M. M., & Di Francesco, S. (2021). Investigation of local scouring around hydrodynamic and circular pile groups under the influence of river material harvesting pits. Water, 13(16), 2192.
  17. Daneshfaraz, R., Sattariyan, M., Alinejad, B., Majedi Asl, M. (2022). Investigation Experimentally the Effect of Roughness of Pile Group on Local Scouring at Presence of Harvesting of River Material Pit. Water and Soil Science, 32(4), 32-46.
  18. Melville, B. W. (1997). Pier and abutment scour: integrated approach. Journal of Hydraulic Engineering, 123(2), 125-136.
  19. Raudkivi, A. J. and Ettema R (1983). Clear-water scour at cylindrical piers. Journal of Hydraulic Engineering, 109(3), 338-350.‏
  20. Dey S, Bose S K and Sastry G L N (1995). Clear Water Scour at Circular Piers: a model. Journal of Hydraulic Engineering, 121 (12), pp. 869-876.
  21. Chiew, Y. M. and Melville, B. W. (1987). Local scour around bridge piers. Journal of Hydraulic Research, Vol. 25, No. 1, pp. 15–26.
  22. Franzetti S., Malavasi, S. and Piccinin, C. (1994). Sull’erosione alla base pile di ponte in acquechiare. Proc., XXIV Convegno di Idraulica e Costruzioni Idrauliche, vol. 2, T4 13-24. (in Italian)
  23. Melville B W and Chiew Y M (1999). Time scale for local scour at bridge piers. Journal of Hydraulic Engineering. 125(1), pp.59-65.
  24. EL-Ghorab E. A. (2013). Reduction of scour around bridge piers using a modified method for vortex reduction. Alexandria Engineering Journal, 52(3), 467-478.
  25. Mohammadi, M. A. (2020). Applied hydraulic transients.