Analysis of scour depth in the case of parallel bridges using HEC-RAS

Mehta, Darshan; Yadav, Shivendra

doi:10.2166/ws.2020.255

Cited by 18 publications

(9 citation statements)

References 17 publications

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“…The HEC-RAS is a popular tool researchers used for analyzing bridge scour. While there are several equations available for computing scour around piers and abutments, the ones included in the HEC-RAS are widely preferred by researchers and engineers [26][27][28].…”

Section: Of 16mentioning

confidence: 99%

Flood Mapping and Scour Potential Prediction Using Hydraulic Model Based on Advanced ASV-Measured Extreme Flood Events Triggered by Snowmelt

Atashi¹,

Lim²

2023

Preprint

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This research is focused on two key areas. The first is mapping the 2022 flood in the Red River of the North near Grafton, North Dakota, US, and the second is evaluating the scour potential of the Grafton Bridge. Local scour of bridge piers can cause hydraulic structures such as bridge piers and abutments to fail during floods, making it a crucial area of investigation. To collect bathymetry and discharge data during low and high flow conditions, including a flood event with a 16.5-year return period in 2022, an Autonomous Surface Vehicle (ASV) incorporated with LiDAR DEM (Digital Elevation Model) data obtained from the US Geological Survey (USGS) National Map was used. Flood mapping and evaluation of local scour around the bridge pier were conducted using the HEC-RAS 6.0.0 software, which utilizes the Colorado State University method as a default equation. This research demonstrates the potential of ASVs in collecting critical data and LiDAR DEM data is an efficient method for flood mapping and determining scour potential, as it integrates bathymetry, flow velocity, and flood prediction.

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Section: Of 16mentioning

confidence: 99%

Flood Mapping and Scour Potential Prediction Using Hydraulic Model Based on Advanced ASV-Measured Extreme Flood Events Triggered by Snowmelt

Atashi¹,

Lim²

2023

Preprint

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“…For example, for a single pier, such as cylindrical 2 , 3 , 5 , 7 – 9 , rectangular 4 , 5 , 10 , or other special shapes 4 – 6 , the flow field, riverbed field, and bed material, among others are the main factor influencing scouring. Regarding multiple piers, however numerical results suggest that, in addition to these basic factors, the placement and number of piers may influence the scour characteristics by affecting the flow field 12 – 16 . Notably, structures, such as piles, placed below the bottom of the pier may influence the scour depth 17 , 18 .…”

Section: Introductionmentioning

confidence: 98%

“…Yilmaz et al 15 modeled two cylindrical piers in tandem and conducted experiments. Mehta and Yadav 16 examined the hydraulic stability of the Sardar Bridge over the Tapi River in India, which has closely arranged multiple piers constructed in parallel. From their experimental findings, Oben-Nyarko and Ettema 17 concluded that the effects of piers and abutments arranged in close proximity should also be considered.…”

Section: Introductionmentioning

confidence: 99%

Model experiments on hydraulic properties around multiple piers with reproduced 3D geometries

Sato

2022

Sci Rep

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The effects of multiple piers with 3D geometries on water levels during floods, as well as riverbed fluctuations and local scour after floods were examined via hydraulic model experiments. The Kintaikyo Bridge in Japan, a world-famous historical triple-wooden-arch bridge, was modeled at a scale of approximately 1/276. The number of model piers was set to four, as in the real bridge, and they were 3D printed and installed in the sand layer of an open channel. To provide adequate information on the pier installation conditions and hydraulic response, four cases were studied in the experiments, primarily considering present pier conditions; the previous conditions of the Kintaikyo Bridge were also considered. The experimental conditions in these four cases depended on whether foundations were present, the piers were skewed against the flow center, and the shape was spindle or similar to that of the present case. In the current bridge condition where foundations are present and there is no skew, water level rise, riverbed fluctuation, and local scour were suppressed. Furthermore, the statistical analysis of the results suggested that riverbed fluctuations are more stable after flooding. The two piers with foundations had smaller scour areas than those without. Further, those with foundations generally had lower mean scour at the pier perimeters. Regarding those without foundations, there were no differences in riverbed fluctuations or local scour due to the skewed pier angle. In addition, the representative length of the pier with a 3D geometry was determined by dividing the projected area of the pier below the initial sand surface in the main flow direction by the pier height, and the relationship between the Froude number or the mean water depth and the maximum scour depth was investigated.

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“…Mehta & Yadav [7] applied HEC-RAS to simulate the scour around Sardar bridge on Tapi river. Ghaderi, et al [4] investigated scour at piers of Simineh bridge in Iran empirically and using HEC-RAS model.…”

Section: Introductionmentioning

confidence: 99%

The Afflux Calculation Under Effect of Different Number of Vents Experimentally and Using HEC-RAS

نصار¹

2022

JES. Journal of Engineering Sciences

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The effect of vents' number in bridges for the same contraction ratio was not taken into consideration in many calculation formulas of afflux. The present paper investigates the influence of vents' number on the calculation of the afflux through bridge for the same contraction ratio. The paper experimentally and numerically modeled the water surface profile through the bridge vents to calculate the afflux. The experimental measurements include two stages, the first stage includes the use of a single pier model with a length of 14.7 cm and a width of 2.3 cm. The second stage includes the presence of two piers of 14.7 cm length and 1.15 cm width for each one. The numerical modeling was done using one-dimensional River Analysis System (HEC-RAS). The results showed that the afflux ratio increased as Froude number increased. The increasing of vents' number for the same contraction ratio increases the afflux. The case of contraction ratio = 0.623 gives the higher values of the afflux ratio comparing other contraction ratios. The numerical modeling is promising compared the experimental measurements.

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Analysis of scour depth in the case of parallel bridges using HEC-RAS

Cited by 18 publications

References 17 publications

Flood Mapping and Scour Potential Prediction Using Hydraulic Model Based on Advanced ASV-Measured Extreme Flood Events Triggered by Snowmelt

Flood Mapping and Scour Potential Prediction Using Hydraulic Model Based on Advanced ASV-Measured Extreme Flood Events Triggered by Snowmelt

Model experiments on hydraulic properties around multiple piers with reproduced 3D geometries

The Afflux Calculation Under Effect of Different Number of Vents Experimentally and Using HEC-RAS

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