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Tác giả hoặc Nhóm tác giả: Dung D. V., Truc N. X., Hung N. T.
Nơi đăng: Proceedings of the 14th Asian Congress of Fluid Mechanics
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; Số: Vol. 2;Từ->đến trang: 960-965.;Năm: 2013
Lĩnh vực: Kỹ thuật; Loại: Báo cáo; Thể loại: Quốc tế
TÓM TẮT
Investigating local scour depths at bridge piers are drawing the attention from many investigators and scientists. However, most of scour-estimation-formulae are empirical (i.e. based on measurement data or experimental data under simple experimental circumstances or under specific topography and geology conditions). They were thus used to build scour depth formulae at bridge piers or to adjust the parameters of the formulae. As a result, when calculating local scour depths at bridge piers which are subjected to the effects of many factors in the flows different from the studied bridge piers; the calculated results varied significantly with distinct formulae, or are different from measured values. One of the parameters in the formulae which has a significant influence on the local scour depth value is the approach channel velocity. The values of approach channel velocity in most of the scour-estimating formulae are deriving from the one-dimensional flow; These values will be unreasonable when the bridge piers are located at the flood plain or at river curvatures and this might cause a large deviations. The calculated results of the local scour depth in these cases are normally very different from those in reality. In order to minimize these deviations, in this paper, the authors used the velocity field derived from the two-dimensional flow horizontally solving numerically by the finite element method from the River2D program, as a basis for determining approach channel velocities and then applying these values to the authors’ theoretical formulae. Based on the experimental data and the field measurements, the authors identify the empirical coefficients in the formulae.
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ABSTRACT
Investigating local scour depths at bridge piers are drawing the attention from many investigators and scientists. However, most of scour-estimation-formulae are empirical (i.e. based on measurement data or experimental data under simple experimental circumstances or under specific topography and geology conditions). They were thus used to build scour depth formulae at bridge piers or to adjust the parameters of the formulae. As a result, when calculating local scour depths at bridge piers which are subjected to the effects of many factors in the flows different from the studied bridge piers; the calculated results varied significantly with distinct formulae, or are different from measured values. One of the parameters in the formulae which has a significant influence on the local scour depth value is the approach channel velocity. The values of approach channel velocity in most of the scour-estimating formulae are deriving from the one-dimensional flow; These values will be unreasonable when the bridge piers are located at the flood plain or at river curvatures and this might cause a large deviations. The calculated results of the local scour depth in these cases are normally very different from those in reality. In order to minimize these deviations, in this paper, the authors used the velocity field derived from the two-dimensional flow horizontally solving numerically by the finite element method from the River2D program, as a basis for determining approach channel velocities and then applying these values to the authors’ theoretical formulae. Based on the experimental data and the field measurements, the authors identify the empirical coefficients in the formulae.
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