Scour hole depth prediction around pile groups: review, comparison of existing methods, and proposition of a new approach

Baghbadorani, Danial Amini; Beheshti, Aliasghar; Ataie-Ashtiani, Behzad

doi:10.1007/s11069-017-2900-9

Cited by 19 publications

(6 citation statements)

References 29 publications

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“…The results of ANOVA are given in Table 5. It should be noted that ANOVA was conducted on the natural logarithm (ln) of the data since power equations are generally more common in typical hydraulic problems (Amini Baghbadorani et al, 2017; Amini Baghbadorani et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

Experimental study on the discharge coefficient of triangular piano key weir*

Sanami

Afshar

Saneie

2021

Irrigation and Drainage

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The present study aims to experimentally evaluate the hydraulic characteristics of a B-type triangular piano key weir (PKW). Equations are proposed for estimating the discharge coefficient (C d ) of type B triangular PKW. Nine PKW models were tested, and the discharge coefficients were obtained. To determine the PKW efficiency, in each flow condition, the experiment was repeated for a linear weir having the same height as the PKW. In particular, the flow rate of the triangular PKW was up to three times higher than that of the linear weir. Studying the flow behaviour showed that the sloping triangular surface of the PKW helps with the quick transfer of flow from the channel bed, especially in the outside keys. In addition, increasing the dimensionless parameters h/L e and h/P reduces the discharge coefficient in the weir. Empirical equations are presented for the triangular PKW discharge coefficient. For the regression analysis, analysis of variance was performed to list the most important variables. Subsequently, by performing sensitivity analysis, the most important dimensionless parameter for estimating the discharge coefficient was obtained. The group method of data handling was applied to the data to achieve higher accuracy. Finally, uncertainty analysis was conducted using the asymmetric loss function.

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Section: Resultsmentioning

confidence: 99%

Experimental study on the discharge coefficient of triangular piano key weir*

Sanami

Afshar

Saneie

2021

Irrigation and Drainage

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“…Formulas for single-pier scour time evolution can be applied, a compilation of which can be found in Sheppard et al (2011). Also, Amini Baghbadorani et al (2017) developed time-variation formulas based on long-duration pile group scour data of Lança et al (2013). Consequently, it is better to extrapolate the short-duration experiments to their equilibrium values as pointed out by Amini Baghbadorani et al (2017).…”

Section: Using Short-duration Scour Experimentsmentioning

confidence: 99%

“…Also, Amini Baghbadorani et al (2017) developed time-variation formulas based on long-duration pile group scour data of Lança et al (2013). Consequently, it is better to extrapolate the short-duration experiments to their equilibrium values as pointed out by Amini Baghbadorani et al (2017). However, the authors used the shortduration data in their raw form for applying multivariate adaptive regression splines (MARS) and genetic expression programming (GEP).…”

Section: Using Short-duration Scour Experimentsmentioning

confidence: 99%

“…(1) use extrapolated scour data compiled by Amini Baghbadorani et al (2017); or (2) discard short-duration data. We presented the results based on extrapolation of raw data in Amini Baghbadorani et al (2017). Since we have already used the extrapolation approach, here we use the elimination of short-term data to develop scour prediction formulas.…”

Section: Developing Formulas Based On Long-duration Datamentioning

confidence: 99%

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Discussion of “Estimation of Clear-Water Local Scour at Pile Groups Using Genetic Expression Programming and Multivariate Adaptive Regression Splines” by S. M. Bateni, H. R. Vosoughifar, B. Truce, and D. S. Jeng

Baghbadorani

Beheshti

Ataie-Ashtiani

2020

J. Waterway, Port, Coastal, Ocean Eng.

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The paper under discussion stated in the "Data" subsection that the authors have compiled 347 pile group (PG) scour data points from 20 sources, and the sources are cited in that section. However, the database size is inconsistent. From the 20 sources cited in the original paper, by excluding Sheppard (2003) and Moreno et al. (2016), the remaining 18 sources have 310 data points, which can be verified by checking the database compilation of Amini Baghbadorani et al. (2017) and its supplementary spreadsheet. Sheppard (2003) presents 6 PG data points, 3 of which are shared with Smith (1999), and Moreno et al. (2016) presents 1 PG data point. Consequently, the 20 sources cited in the original paper have 317 data points, which is less than 347 points mentioned in their work. These problems would have been avoided if the authors had cited the database of Amini Baghbadorani et al. (2017), which contains 365 pile group scour data.

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“…Here S(t) is the scour depth at time t, and S eq is the equilibrium scour depth. According to Baghbadorani et al [27], the value of S eq can be achieved by the following methods: the value of K t for each case is calculated at the end of each test, that is, K t (t end ). Then the equilibrium scour depth could be derived through S eq = S end /K t (t end ).…”

Section: Criterion For Equilibriummentioning

confidence: 99%

Experimental Investigation of Scour Prediction Methods for Offshore Tripod and Hexapod Foundations

Xue

2020

JMSE

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Scour prediction is essential for the design of offshore foundations. Several methods have been proposed to predict the equilibrium scour depth for monopiles. By introducing an effective diameter, such methods could also be applied to predicting scour depth for pile groups. Yet, there are still difficulties in estimating the equilibrium scour depth of foundations in complex shapes, such as the tripod foundation. This study investigates the clear-water scour around the tripod and hexapod foundations through laboratory experiments, with uniform bed sediment and steady current. Here, the authors propose an approach to calculate the effective diameter for the tripod and hexapod models, which is similarly as for the pile groups. Three widely-used methods in predicting equilibrium scour depth have been evaluated, and the best method is recommended.

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Scour hole depth prediction around pile groups: review, comparison of existing methods, and proposition of a new approach

Cited by 19 publications

References 29 publications

Experimental study on the discharge coefficient of triangular piano key weir*

Experimental study on the discharge coefficient of triangular piano key weir*

Discussion of “Estimation of Clear-Water Local Scour at Pile Groups Using Genetic Expression Programming and Multivariate Adaptive Regression Splines” by S. M. Bateni, H. R. Vosoughifar, B. Truce, and D. S. Jeng

Experimental Investigation of Scour Prediction Methods for Offshore Tripod and Hexapod Foundations

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