[1] Geng Yanfen, Ke Xing, Zheng Xin,. Spatiotemporal distribution characteristics of bridge deck runoff [J]. Journal of Southeast University (English Edition), 2018, 34 (4): 517-523. [doi:10.3969/j.issn.1003-7985.2018.04.015]

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Spatiotemporal distribution characteristics of bridge deck runoff()

桥面径流的时空分布特性

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

34

Issue:

2018 4

Page:

517-523

Research Field:

Traffic and Transportation Engineering

Publishing date:

2018-12-20

Info

Title:

Spatiotemporal distribution characteristics of bridge deck runoff

桥面径流的时空分布特性

Author(s):

Geng Yanfen, Ke Xing, Zheng Xin

School of Transportation, Southeast University, Nanjing 210096, China

耿艳芬, 柯兴, 郑鑫

东南大学交通学院, 南京 210096

Keywords:

two-dimensional shallow water equations;  bridge deck runoff;  spatiotemporal characteristics;  ponding depth;  water film thickness

二维浅水方程;  桥面径流;  时空特性;  路肩积水;  路面水膜

PACS:

U416.2

DOI:

10.3969/j.issn.1003-7985.2018.04.015

Abstract:

The spatiotemporal characteristics of bridge deck runoff under a natural rainfall event are explored. The Taizhou Bridge is taken as a study case, and a hydrodynamic model based on the two-dimensional shallow water equations is used to analyze the runoff characteristics. The results indicate that the runoff velocity rate and depth are positively related to rainfall intensity, yet they have different response degrees to it. The inlet’s effect degree on lane water film has a positive relationship with rainfall intensity. A natural logarithm function(R²=0.706)can illustrate this relationship. However, the inlet’s effect degree on ponding at the curb shows a negative relationship with the rainfall intensity. A negative exponential function(R²=0.824)can reveal this relationship. With the decrease in the longitudinal slope S_L, the ponding depth at the curb increases significantly at the bridge approach slab, whereas the lane water film thickness(WFT)is almost unchanged, but the lane WFT increases greatly at the location with the minimum longitudinal slope. It is concluded that the characteristics of the bridge deck runoff present apparent spatiotemporal differences, the inlet’s effects on bridge deck runoff are quantitatively correlated with rainfall intensity, and the effective drainage measures are necessary for the bridge approach slab.

探究了桥面径流在自然降雨过程中的时空特性.以泰州大桥为例, 采用基于二维浅水方程的水动力学数值模型对桥面径流进行模拟分析.结果表明, 桥面径流流速和水深与雨强成正相关关系, 但两者对雨强的响应度不同.泄水口对路面水膜的影响度与雨强成正相关, 该关系可由自然对数函数表示(R²=0.706);泄水口对路肩积水的影响度与雨强成负相关, 该关系可由负指数函数表示(R²=0.824).在桥台搭板处, 随纵坡S_L减小, 路肩积水深度显著增加, 路面水膜厚度基本保持不变, 但路面水膜厚度在最小纵坡处发生明显增加.由此得出结论, 桥面径流分布有明显的时空差异性, 泄水口对桥面径流的影响度与雨强之间存在较强的非线性关系, 桥台搭板处需设置高效的排水设施.

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Memo

Memo:

Biography: Geng Yanfen(1978— ), female, doctor, associate professor, yfgeng@seu.edu.cn.
Foundation item: The National Natural Science Foundation of China(No.51109039, 5147814).
Citation: Geng Yanfen, Ke Xing, Zheng Xin.Spatiotemporal distribution characteristics of bridge deck runoff[J].Journal of Southeast University(English Edition), 2018, 34(4):517-523.DOI:10.3969/j.issn.1003-7985.2018.04.015.

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