Scour countermeasures around cylindrical pier by using downscaled W weir

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-09-04 DOI:10.1680/jwama.22.00026

R. Karthik, U. Kumar, A.K. Barbhuiya

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Abstract

Scour is a significant concern for bridge design and maintenance, and scour countermeasures are often used to prevent or reduce erosion caused by scouring. The W weir is a grade control structure that serves many purposes, including scour controls at the bridge pier. A series of laboratory experimental runs were carried out by changing the size and height along with its location from the pier to the weir to optimize the structural configuration of downscaled W weir. It is observed from the experiments that the scour hole profile at the upstream of the downscaled W weir changes with the height of the weir. When the height of the weir was 1.0D (D = diameter of the pier), two small depressions of almost identical size were observed inside the main scour hole, one just in front of each upstream apex of the W weir. One cone-shaped scour hole was observed when the height of the W weir was 0.5D with its maximum depth in between the upstream apexes. The reduction of scour in front of the pier was more when the height of the weir was 1.0D. The maximum scour control achieved among all the different structural combinations of downscaled W weir was 47.66%. The maximum scour control was achieved when the downscaled W weir had a 2.0D size with the height of 1.0D placed at a 2.0D distance from the pier.

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缩小W型堰的圆柱墩冲刷对策

冲刷是桥梁设计和维修中重要的问题，通常采用冲刷对策来防止或减少冲刷造成的侵蚀。W堰是一种控制坡度的结构，有多种用途，包括控制桥墩的冲刷。通过改变尺寸和高度以及从桥墩到堰的位置，进行了一系列的实验室试验，以优化缩小W堰的结构配置。实验结果表明，缩小后的W型堰上游冲刷孔剖面随堰高的变化而变化。当堰高为1.0D (D =桥墩直径)时，在主冲刷孔内观察到两个大小几乎相同的小洼地，一个位于W堰上游顶点的正前方。当W堰高度为0.5D时，观察到一个锥形冲刷孔，其最大深度在上游尖顶之间。当堰高为1.0D时，墩前冲刷减小幅度更大。不同结构组合对W堰冲刷的最大控制效果为47.66%。当缩小后的W堰尺寸为2.0D，高度为1.0D，与桥墩距离为2.0D时，可以实现最大的冲刷控制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.