Experimental Investigation on Specifications of Scouring Hole Under the Pipelines Across the Waterway Under Steady Flow

Document Type : Research Paper


1 M.Sc. in Civil Engineering, Water & Hydraulic Structures, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

2 Professor, Department of Water Structures, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

3 Assistant Professor, Department of Water Structures, Shahid Chamran University of Ahvaz, Ahvaz, Iran


Pipelines passing across the river to convey water, gas, and petroleum may develop local scour at the pipeline location. Scour development may cause damage due to pipe failure and disorder in utilization. The eddy currents around the pipe lead to the scouring phenomenon causing the non-uniformity of the pipeline and its fracture which will ultimately have environmental and destructive consequences. In this study, the effect of pipe diameter has been investigated. The experiments were conducted with five diameters (20, 30, 40, 50, and 60 mm) in three Froude numbers (0.2, 0.235, and 0.26) under identical bed conditions. In the following part, scouring profiles were taken and the scouring progresses over time and maximum scour depth were investigated. The results show that scouring under pipe for a diameter of 60 mm has the highest and is the most progressing towards time compared to other diameters.


Main Subjects

1-    Azamathulla, H.M., Yusoff, M.A.M. and Hasan, Z.A., 2014. Scour below submerged skewed pipeline. Journal of Hydrology509, pp.615-620.
2-    Chao, J.L. and Hennessy, P.V., 1972. Local scour under ocean outfall pipelines. Journal (Water Pollution Control Federation), 44(7), pp.1443-1447.
3-    Chiew, Y.M., 1990. Mechanics of local scour around submarine pipelines. Journal of Hydraulic Engineering116(4), pp.515-529.
4-    Chiew, Y.M., 1991. Prediction of maximum scour depth at submarine pipelines. Journal of Hydraulic Engineering117(4), pp.452-466.
5-    Dey, S. and Singh, N.P., 2007. Clear-water scour depth below underwater pipelines. Journal of Hydro-Environment Research1(2), pp.157-162.
6-    Dey, S. and Singh, N.P., 2008. Clear-water scour below underwater pipelines under steady flow. Journal of Hydraulic Engineering134(5), pp.588-600.
7-    Dey, S., 2014. Bed-Load Transport.  Fluvial Hydrodynamics. Springer, Berlin, Heidelberg. pp. 261-326
8-    Hansen, E.A., 1986. Two-dimensional scour below pipelines. In Proc. 5th Int. Symp. Offshore Mechanic and Arctic Engineering, ASME, Tokyo, Japan, 1986.
9-    Jensen, B.L., Sumer, B.M., Jensen, H.R. and Fredsoe, J., 1990. Flow around and forces on a pipeline near a scoured bed in steady current. Journal of Offshore Mechanics and Arctic Engineering112(3), pp.206-213.
10- Li, F. and Cheng, L., 1999. Numerical model for local scour under offshore pipelines. Journal of Hydraulic Engineering125(4), pp.400-406.
11- Mao, Y., 1986. The interaction between a pipeline and an erodible bed. Series paper 39, Doctoral dissertation, Ph. D. thesis. Tech. University of Denmark.
12- Mehrabadi, J., Gahraman, B. And Esmaili, K., 2017. Experimental analysis of the interaction between the unidirectional flow and spoiler on mechanism of  selfburial  pipelines. Iranian Journal of Irrigation and Drainage,(11), pp. 960-971.(in Persian).
13- Postacchini, M. and Brocchini, M., 2015. Scour depth under pipelines placed on weakly cohesive soils. Applied Ocean Research52, pp.73-79.
14- Sumer, B.M., 2002. The mechanics of scour in the marine environment (Vol. 17). World Scientific Publishing Company.
15- Van Beek, F.A. and Wind, H.G., 1990. Numerical modelling of erosion and sedimentation around offshore pipelines. Coastal Engineering14(2), pp.107-128.
16- Zhao, M., Vaidya, S., Zhang, Q. and Cheng, L., 2015. Local scour around two pipelines in tandem in steady current. Coastal Engineering98, pp.1-15.
Volume 43, Issue 3
October 2020
Pages 117-131
  • Receive Date: 22 May 2018
  • Revise Date: 28 November 2018
  • Accept Date: 02 December 2018
  • First Publish Date: 22 September 2020