KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Temporal Variation of Local Scour Depth around a Bridge Pier

시간에 따른 교각 주위에서의 세굴심의 변화

Lee, Seung-Oh;Lee, Jin-Woo;Cho, Yong-Sik
이승오;이진우;조용식

  • Published : 20070100

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Abstract

The relationship between the flow intensity, defined as the ratio of approach flow velocity to critical velocity of bed materials, and the dimensionless time, tVc/y1, is investigated based on experimental data form the literature and this study. The modified formula for the equilibrium time scale is also presented. The root mean square error (RMSE) and the discrepancy ratio (r), defined as the ratio of the calculated value to the observed value, are employed for the quantitative comparison between the original and modified formula. It is observed that the scouring rate in front of a bridge pier becomes independent of the flow intensity for V1 / Vc > 0.75. While the relative sediment size, b/d50, only weakly influences the rate of scouring, the equilibrium scour depth itself is highly affected by the value of the relative sediment size. It is the effect of this independent variable about which the least is known or understood either for predicting scour depths or selecting the appropriate sediment size in laboratory experiments of scour. Therefore, in order to compare the equilibrium scour depth between laboratory experiments and field in detail, more consideration of the effect of b/d50 on scour depth should be required.

Keywords

References

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