DETERMINATIONS OF AFFECTING PARAMETERS ON BRIDGE PIER SCOUR USING NEW METHODS

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SEYEDIAN SEYED MORTEZA

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Journal: Journal of Irrigation and Water Engineering Year:2015 | Volume:5 | Issue:19 Page(s): 1-16

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Title

DETERMINATIONS OF AFFECTING PARAMETERS ON BRIDGE PIER SCOUR USING NEW METHODS

Author(s)

SEYEDIAN SEYED MORTEZA | Issue Writer Certificate

Keywords

FSQ2

GAMMA TESTQ2

PIER SCOURQ2

PCAQ2

SVMQ1

Abstract

Estimating of bridge piers scouring is essential for engineers. Since many empirical formulas to predict the scour depth is presented and this formula used various dimensionless and dimensional parameters. In this study, two series dimensional and dimensionless parameters that are expected to be effective on PIER SCOUR were selected. Then, parameters affecting the scour were selected using three different methods: GAMMA TEST (GT), principal component analysis (PCA) and stepwise regression (FS). Findings indicated that using GT critical velocity and pier length to width ratio are most important dimensional and dimensionless parameters respectively and pier shape is less effective. Furthermore, 360 amounts of training data are required to ensure robust model estimation. Finally, we examine the use of support vector machines (SVMs) for estimating the scour depth using selected input parameters by three methods. The results showed that the accuracy of dimensionless parameters set by all three methods is low, but SVM technique was estimate the scour depth using dimensional parameters successfully. The coefficient of determination of the GT, PCA and FS parameters in test phase is 0.76, 0.69 and 0.73 respectively and RMSE is 0.63, 0.55 and 0.50 respectively. In this study, in order to increase accuracy, two different combinations of input parameters to estimate the scour depths were determined. The performances of SVM and empirical formula for scour depth prediction were compared and results showed that SVM model can be used for predicting scour depth more accurately compared to empirical formula using dimensional parameters.

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APA: Copy

SEYEDIAN, SEYED MORTEZA. (2015). DETERMINATIONS OF AFFECTING PARAMETERS ON BRIDGE PIER SCOUR USING NEW METHODS. IRANIAN OF IRRIGATION & WATER ENGINEERING, 5(19), 1-16. SID. https://sid.ir/paper/247225/en

Vancouver: Copy

SEYEDIAN SEYED MORTEZA. DETERMINATIONS OF AFFECTING PARAMETERS ON BRIDGE PIER SCOUR USING NEW METHODS. IRANIAN OF IRRIGATION & WATER ENGINEERING[Internet]. 2015;5(19):1-16. Available from: https://sid.ir/paper/247225/en

IEEE: Copy

SEYED MORTEZA SEYEDIAN, “DETERMINATIONS OF AFFECTING PARAMETERS ON BRIDGE PIER SCOUR USING NEW METHODS,” IRANIAN OF IRRIGATION & WATER ENGINEERING, vol. 5, no. 19, pp. 1–16, 2015, [Online]. Available: https://sid.ir/paper/247225/en

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