SRICOS-EFA Method for Contraction Scour in Fine-Grained Soils

Briaud, Jean‐Louis; Chen, H.-C.; Li, Y.; Nurtjahyo, P; Wang, J.

doi:10.1061/(asce)1090-0241(2005)131:10(1283)

Cited by 51 publications

(23 citation statements)

References 9 publications

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“…Bridge scour is the term given to the excavation and removal of material from the bed and banks of rivers as a result of the erosive action of flowing water (Hamill 1999). Scouring of bridge foundations is the primary cause of failure of bridges in the United States (Briaud et al 2001(Briaud et al , 2005Melville and Coleman 2000). One study of over 500 bridge failures which occurred between 1989 and 2000 in the US deemed flooding and scour to be the primary cause of 53% of failures (Wardhana and Hadipriono 2003).…”

Section: Bridge Scourmentioning

confidence: 99%

Determining the Presence of Scour around Bridge Foundations Using Vehicle-Induced Vibrations

2016

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Bridge scour is the number one cause of failure in bridges located over waterways. Scour leads to rapid losses in foundation stiffness and can cause sudden collapse. Previous research on bridge health monitoring has used changes in natural frequency to identify damage in bridge beams. The possibility of using a similar approach to identify scour is investigated in this paper. To assess if this approach is feasible, it is necessary to establish how scour affects the natural frequency of a bridge and is it possible to measure changes in frequency using the bridge dynamic response to a passing vehicle. To address these questions, a novel Vehicle-Bridge-Soil Interaction (VBSI) model is developed. By carrying out a modal study in this model, it is shown that for a wide range of possible soil states, there is a clear reduction in the natural frequency of the first mode of the bridge with scour. Moreover, it is shown that the response signals on the bridge from vehicular loading are sufficient to allow these changes in frequency to be detected.

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Section: Bridge Scourmentioning

confidence: 99%

Determining the Presence of Scour around Bridge Foundations Using Vehicle-Induced Vibrations

2016

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“…Sediment erosion around the base of a bridge pier, bridge scour, is the leading cause of bridge collapse in the United States (Briaud et al 2005).…”

Section: Figures and Tablesmentioning

confidence: 99%

Passive gamma-ray emission for underwater sediment-disturbance detection

Clausen¹

2017

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Sediment erosion around physical structures in surface water (e.g., bridge footings) is an important phenomenon to monitor. Traditional assessment methods rely on divers to make physical observations and measurements. Often, high currents and the high degree of turbidity of the water make these observations difficult. High turbidity can also prevent lowering a camera from a boat to make indirect visual observations. Another possible approach to this problem is the use of gamma-ray spectrometry. This study used a handheld sodium iodide gamma-ray detector to collect in situ gamma-ray spectra of two soils submerged in water. Study results indicate that naturally occurring gamma rays being emitted by the sediment are detectable underwater. Further, the difference in gamma-ray intensity reflects density differences in the sediment due to disturbances such as erosion. A difference between the Potassium 40 (40K) activity of uncompacted and compacted soil and a comparable rate of 40K signal attenuation as standing water depth increased suggests that underwater detection of in situ 40K gamma-ray emissions is a potentially viable approach to assessing underwater sediment erosion. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.

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“…An overview of the most remarkable studies in the 20th century is given in Melville and Coleman [9]. More recently, Briaud et al [10] extended the SRICOS-EFA (Scour Rate in Cohesive Soils-Erosion Function Apparatus) method to the case of contraction scour. The method addresses clear-water contraction scour in fine-grained soils and is based on site-specific soil testing.…”

Section: Introductionmentioning

confidence: 99%

Morphological Patterns at River Contractions

Oliveto

Marino

2019

Water

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Sediment transport at river contractions is an important process of engineering concern which might occur when a river encounters a reduction in flow area because of either natural or artificial constraints. This paper focuses on the morphological patterns that are prone to form at and around the constriction of watercourses based on experimental investigations at laboratory scale. Experiments were carried out at the University of Basilicata, Italy, in a 1 m wide and 20 m long rectangular channel. The length of the working section extended up to 16 m, according to the length of the contraction model. Two nearly-uniform sediments were used as mobile bed, sand with median grain size d50 = 1.7 mm and gravel with d50 = 9.0 mm. The contraction length was either 0.5, 1.0, 2.0 or 3.0 m. Runs were carried out under steady flow and clear-water approach flow conditions. Typically, they were of long duration (up to 15 days) also to achieve an equilibrium state. New predictive equations are given on the temporal progress of: the maximum scour depth, the scour hole length, and the axial bed profile with emphasis on the processes of bed aggradation or degradation beyond the contracted region.

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SRICOS-EFA Method for Contraction Scour in Fine-Grained Soils

Cited by 51 publications

References 9 publications

Determining the Presence of Scour around Bridge Foundations Using Vehicle-Induced Vibrations

Determining the Presence of Scour around Bridge Foundations Using Vehicle-Induced Vibrations

Passive gamma-ray emission for underwater sediment-disturbance detection

Morphological Patterns at River Contractions

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