Local Scour Around Bridge Piers

Shen, Hsieh Wen; Schneider, Verne R.; Karaki, S.

doi:10.1061/jyceaj.0002197

Cited by 207 publications

(44 citation statements)

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“…[This assumption was corroborated by Jones and Sheppard (11).] The laboratory data in Figure 1 are a subset of the data of Chabert and Engeldinger (9) and Shen et al (10), and the graph shows the dimensionless variables used in the analysis, along with the best-fit line through that data. The best-fit line shown on Figure 1 is the basic HEC-18 pier scour equation in a rearranged format.…”

Section: Hec-18 Pier Scour Equationmentioning

confidence: 66%

“…All the laboratory data are for single piers that are circular and so have no skew to flow. These laboratory data included the measurements from Chabert and Engeldinger (9) and Shen et al (10), from which Richardson et al (8) selected a subset of data to develop the original HEC-18 pier scour equation. Richardson et al did not publish the data used in their analysis (8), so there is some ambiguity about the exact subset of data that they selected.…”

Section: Laboratory and Field Data Used In The Investigationmentioning

confidence: 99%

“…However, they did identify the median grain size (D50) associated with the selected pier scour measurements, which included D50 equaling 0.24, 0.26, and 0.52 mm. For the present investigation, measurements with these specific D50 were compiled from the work of Chabert and Engeldinger (9) and Shen et al (10), 63 and 19 measurements, respectively, and used to gain insight into the development of the original HEC-18 pier scour equation. The characteristics associated with this subset of data are shown in Table 1 and are referred to as HEC-18 data for the rest of this paper.…”

Section: Laboratory and Field Data Used In The Investigationmentioning

confidence: 99%

See 2 more Smart Citations

Use of Laboratory and Field Data to Evaluate the Pier Scour Equation from Hydraulic Engineering Circular 18

Benedict¹,

Knight²

2017

Transportation Research Record: Journal of the Transportation R

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The Hydraulic Engineering Circular 18 (HEC-18) pier scour prediction equation is the most widely used pier scour prediction equation in the United States, if not the world, and understanding the equation’s performance is of interest to the bridge engineering community. Previous evaluations of the equation’s performance were limited to smaller sets of laboratory and field data. In 2014, the U.S. Geological Survey, in cooperation with the South Carolina Department of Transportation, published a U.S. Geological Survey pier scour database, consisting of 569 laboratory and 1,858 field measurements of pier scour. This extensive database is a valuable resource for evaluating the HEC-18 pier scour equation, which is the primary focus of the investigation presented in this paper. Although comparing predicted and measured values is a common method for evaluating the performance of a prediction equation, the present investigation used a different approach and evaluated the HEC-18 equation by comparing selected data from the USGS database with the dimensionless relationship used to develop the original equation. This alternative approach highlighted some of the strengths and weaknesses of the equation, which are not as evident in the more common approach of comparing predicted and measured values. The findings of the investigation are presented in this paper.

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Section: Hec-18 Pier Scour Equationmentioning

confidence: 66%

Section: Laboratory and Field Data Used In The Investigationmentioning

confidence: 99%

Section: Laboratory and Field Data Used In The Investigationmentioning

confidence: 99%

See 1 more Smart Citation

Use of Laboratory and Field Data to Evaluate the Pier Scour Equation from Hydraulic Engineering Circular 18

Benedict¹,

Knight²

2017

Transportation Research Record: Journal of the Transportation R

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“…Less than 1.3 1.23 Preventing the non-uniformity of sediment grains reduces the depth of scouring equilibrium Chiew (1995), Ettema (1980) and Shen et al (1969) Flow depth (y) More than 4 times the pier diameter 21…”

Section: 85mentioning

confidence: 99%

The impact of cables on local scouring of bridge piers using experimental study and ANN, ANFIS algorithms

et al. 2021

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The main purpose of this study is to analyze and predict scour depth and hydraulic performance of piers using soft computing methods and to estimate scour depths using artificial neural networks and ANFIS methods. In the present study, three situations were studied: a rectangular pier without a cable (type I), a rectangular pier with a cable that has a diameter equal to 10% of the pier diameter, and a cable twist angle of 15 degrees (type II), and a rectangular pier with a cable 15% of the pier diameter and an angle of twist of 12 degrees (type III). Tests were carried out with different flow-approach angles: zero, 5, 10, and 15 degrees. Dimensional analysis based on the π Buckingham method was performed. Then, the effect of different parameters, and their importance for estimating scour depth was investigated. Piers with an angle of 15 degrees with respect to the direction of flow had the greatest depth of scouring. Cables can reduce scour depths at this angle; for the second and third classes of piers, the scouring is 10 and 22% compared to the first pier classification. For the second type of pier, angles of 5, 10, and 15 degrees led to increases in scouring depths of 3, 21, and 37% compared to the zero-angle situation.

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“…10.1029/2020WR028804 2 of 18 Cheng and Wei (2019) further showed that R p essentially quantifies the size of the horseshoe vortex system in front of a pier (Shen et al, 1969), which can be measured as the distance from the separation point of the approach boundary layer to the nose of the pier. Some published R p -values are compared in Figure 2, in which the data points denote the laboratory measurements of the vortex size reported by Kothyari et al (1992) and Sumer and Fredsøe (2002).…”

Section: Case I: Junction Flow At a Piermentioning

confidence: 99%

Unified Criterion for Clear‐Water Local Scour Induced by Junction Flows and Wall Jets

Cheng

Wei

et al. 2021

Water Resources Research

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Sediment erosion and deposition are the two basic processes that shape rivers and coasts. The processes become complex in the presence of human interventions, such as bridge construction, pipeline installation, and various offshore developments, which may cause intensive local scour (Graf & Altinakar, 2017). Around manmade structures, the formation of local scour holes may endanger their foundations, and sometimes lead to catastrophic structural failure (Hong et al., 2012). There have been substantial research results over the past eight decades, which were not only discussed in archival publications but also summarized in published reports and design manuals (

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Local Scour Around Bridge Piers

Cited by 207 publications

References 0 publications

Use of Laboratory and Field Data to Evaluate the Pier Scour Equation from Hydraulic Engineering Circular 18

Use of Laboratory and Field Data to Evaluate the Pier Scour Equation from Hydraulic Engineering Circular 18

The impact of cables on local scouring of bridge piers using experimental study and ANN, ANFIS algorithms

Unified Criterion for Clear‐Water Local Scour Induced by Junction Flows and Wall Jets

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