Clear-water scour evolution at dual bridge piers

For the efficient design of bridge pier footings, computation of time-evolution of scour depth around bridge piers is essential. In this paper, a semi-empirical model is developed to estimate the temporal variation of clear-water scour depth at a couple of identical cylindrical uniform piers in tandem arrangement. The experiments are carried out using different pier size, pier spacing, and flow intensities. The model development is based on sediment continuity approach and volumetric sediment transport rate from the scour hole using a sediment pickup function. The model results are presented as design charts giving the relation between dimensionless scour depth and time for practical use. Results of the proposed model are in relatively good agreement with the experimental results, in the tested range.


Time-Evolution of Clear Water Scouring at Dual Bridge Piers
Yilmaz, Meriç; Yanmaz, Ali Melih; Köken, Mete (2018-01-01)
Time evolution of the maximum scour depth around piers up to peak value of the design flow is required for safe foundation design of bridges crossing alluvial rivers. This study deals with an experimental work conducted to investigate the surface characteristics of scour-holes around dual piers aligned with the flow direction under clear water conditions with uniform bed material. Experiments are conducted using different sizes of identical cylindrical dual piers for different spacing and flow intensities. ...
Modeling temporal variation of scouring at dual bridge piers
Selamoğlu, Meriç; Yanmaz, Ali Melih; Köken, Mete; Department of Civil Engineering (2015)
Computation of temporal evolution of scour depth around bridge piers is essential for the efficient design of bridge pier footings. In this thesis, empirical scour-prediction equations and a semi-empirical model are developed to predict the temporal variation of maximum clear-water scour depth at dual cylindrical uniform piers with identical size in tandem arrangement. Experiments are conducted using different pier size, pier spacing, and flow intensities. The semi-empirical model is based on sediment conti...
Uncertainty of local scouring parameters around bridge piers
Yanmaz, Ali Melih (2001-03-01)
Reliability-based assessment of local scouring mechanism around bridge piers provides information for decision-making regarding the pier footing design. Parameter uncertainties that may arise from various sources due to the inability to precisely quantify a parameter need to be estimated in order to quantify the level of risk of pier failure during the physical life of a bridge. By examining extensive experimental data from the literature on local scour depth around various shapes of bridge pier the functio...
Effect of Pier Inclination Angle on Local Scour Depth Around Bridge Pier Groups
Bozkuş, Zafer; DINCER, A. Ersin (2018-10-01)
The primary objective of this study is to investigate experimentally local scours around bridge pier groups at various inclination angles of piers and also to develop empirical local scour depth equations. In the study, two bridge pier groups are used. In each pier group, the most upstream and downstream piers are placed in an inclined manner at 10 degrees and 15 degrees. The vertical case was also employed for comparison purposes. Seventy-two experiments each lasting 6 h are conducted under uniform-flow an...
Effects of inclination of bridge piers on scouring depth
Bozkuş, Zafer (2004-08-01)
For a safe design of a bridge pier footing, it is important to estimate the maximum depth of scour as accurately as possible. The aim of this experimental study is to investigate the effects of inclination of bridge piers on local scour depths around bridge piers. Single circular piers inclined toward the downstream direction were founded in a uniform bed material. Near threshold conditions were employed. The results of this study indicate that the local scour depth decreases as the inclination of the pier ...
Citation Formats
M. Yilmaz, A. M. Yanmaz, and M. Köken, “Clear-water scour evolution at dual bridge piers,” CANADIAN JOURNAL OF CIVIL ENGINEERING, pp. 298–307, 2017, Accessed: 00, 2020. [Online]. Available: