Clear‐Water Scour at Cylindrical Piers

Raudkivi, Arved J.; Ettema, Robert

doi:10.1061/(asce)0733-9429(1983)109:3(338)

Cited by 354 publications

(131 citation statements)

References 2 publications

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“…This finding is consistent with the well known circumstance that the time needed to develop equilibrium depths of scour at bridge piers is approximately proportional to the volume of the equilibrium scour hole for a given flow condition [8,9].…”

Section: Experimental Set-upsupporting

confidence: 91%

Preliminary experimental tests of local erosion at river piers with a particular shape

Ciaravino

2009

WIT Transactions on Ecology and the Environment

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In the present study early experimental tests concerning local erosion phenomena have been carried out on a particular shape of the already effective circular piers in order to determine if any improvement is verified in their shape coefficient (with a corresponding decrease in scour). In particular, the circular pier foundation has been shaped as a truncated cone, partially or totally sunk into the mobile bed. In the experimental tests a preliminary comparison has been effected between scour at uniform circular pier and non-uniform piers with two different values of bevel angle β for the truncated cone foundation. Experimental results have shown that, for both values of β, the scour depth has been lower than that identified in experimental tests conducted on circular piers of the same diameter but without the truncated cone foundation. This interesting results open up an encouraging research field.

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Section: Experimental Set-upsupporting

confidence: 91%

Preliminary experimental tests of local erosion at river piers with a particular shape

Ciaravino

2009

WIT Transactions on Ecology and the Environment

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“…Moreover, flow distribution through the natural channel is non-uniform. Therefore the applied formulae do not quite necessarily represent the real situation in the field [11,12].…”

Section: Resultsmentioning

confidence: 99%

Validation of Some Bridge Pier Scour Formulae Using Field and Laboratory Data

Mohamed¹,

Noor²,

Ghazali³

et al. 2005

American J. of Environmental Sciences

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Estimation of maximum local scour depth at the bride pier site is necessary for the safety and economy of the designed bridge. Numerous formulae are available and almost all of these formulae were developed based on laboratory data. Validation of these formulae is necessary in order to ascertain which of the formulae will give a reasonable estimate of the local scour depth. In this study, four commonly cited formulae were selected for the validation process using both the laboratory and field data. They were the Colorado State University (CSU), Melville and Sutherland, Jain and Fisher, and Laursen and Toch formula. The experimental data was obtained from the laboratory model study done at University Putra Malaysia, whilst the field data were obtained from 14 bridges sites. Three statistical tests were carried out to determine the formula that gives minimum prediction errors. Comparison between the predicted and measured depth of scour from the experimental and field data showed that the Laursen and Toch and the CSU formulae appeared to give a reasonable estimate. Whilst the Melville and Sutherland and Jain and Fisher formulae appeared to over-predict the depth of the scour. This observation was supported by the statistical tests.

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“…Large quantities of equilibrium local scour data have been contributed by many researches in recent years including data source for non-uniform (column and pile cap) and pile group of 615 data points. 82 experiments were designed so that the contraction effects, sediment size, and flow depth on scour depth become negligible as recommended by Raudkivi and Ettema [24] and Melville and Sutherland [25]. This was true for other data as well.…”

Section: Databasementioning

confidence: 99%

Evaluation of Harmony Search Optimization to Predict Local Scour Depth around Complex Bridge Piers

2018

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One of the main causes of bridge collapse may be flood flow scour near piers. Several experimental and local field investigations were carried out to study scour depth. However, existing empirical equations do not commonly provide accurate scour prediction due to the complexity of the scour process. Physical and economic considerations often lead to bridge foundation constructs which included a pier column based on a pile cap supported by an array of piles. Piers with this configuration are referred to as complex piers. A few studies have been done on complex bridge pier scour depth estimation. Such efforts may be classified into theoretical and empirical equations. This paper investigates local scour around complex bridge piers by using harmony search algorithm under clear water conditions. Statistical indices such as the coefficient of determination (R2), root mean square error (RMSE), mean absolute error (MAE), mean absolute percentage error (MAPE), and bias were used to evaluate the performance of these methods. By designing laboratory tests, 82 experimental data points were measured by authors. Also 615 experimental data sets with the same measured experimental conditions were collected from published literature and used for optimization. The results show that the developed HS model can predict scour depth better than other equations according to statistical indices.

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Clear‐Water Scour at Cylindrical Piers

Cited by 354 publications

References 2 publications

Preliminary experimental tests of local erosion at river piers with a particular shape

Preliminary experimental tests of local erosion at river piers with a particular shape

Validation of Some Bridge Pier Scour Formulae Using Field and Laboratory Data

Evaluation of Harmony Search Optimization to Predict Local Scour Depth around Complex Bridge Piers

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