Rationality in pier geometry of Kintaikyo Bridge from viewpoint of river engineering
Rationality in pier geometry of Kintaikyo Bridge from viewpoint of river engineering
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DOI：
10.1186/s40494-021-00576-3
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发表时间：
2021-08-26
期刊：
影响因子：
2.5
通讯作者：
Sato, Hirokazu
中科院分区：
文献类型：
--
作者：
Sato, Hirokazu
金台桥以其优雅的木制拱门，独特的码头形状，继续受到居民和游客的喜爱。虽然这座桥是一座活跃的人行桥，也是与西木川及其河流海滩一起沿着的重要景观元素，但其桥墩造型的合理性或不合理性仍是未知数。本文通过1/129比尺的水工模型试验，首次阐明了桥墩的河工特性。测试的形状是一个完美的纺锤形（这已被采用作为一个共同的理论多年）和重建的当前形状的基础上纺锤形，并为比较，椭圆形和不规则的六边形形状具有相同的宽度和面积。当前形状，沿着纺锤形，抑制桥墩周围的水位上升超过其他形状。在河床起伏方面，水流形态对河床冲刷的影响略大于其他形态，但也使冲刷部位附近的泥沙淤积最大化。换句话说，目前的形状有可能促进洪水后恢复的沉积物的采购。此外，目前的形状压倒性地减少了与实验相关的统计分散，这表明它稳定了河床波动的趋势，即使在实际洪水。根据研究结果，对锦带桥的保护进行了探讨。
The Kintaikyo Bridge, with its elegant wooden arches, has a unique pier shape and continues to be loved by residents and visitors alike. Although this bridge is an active footbridge and an important landscape element along with the Nishikigawa River and its river beach, the rationality or irrationality of the shape of its piers remains unknown. This paper is intended to clarify the river engineering characteristics of the piers for the first time by conducting 1/129 scale hydraulic model experiments. The shapes tested were a perfect spindle shape (which has been adopted as a common theory for many years) and a reconstructed current shape based on the spindle shape, and for comparison, an oval and a non-regular hexagon shape with the same width and area. The current shape, along with the spindle shape, suppressed the water level rise around the pier more than the others. As for the riverbed fluctuation, the current shape slightly increased the scour more than the others, but it also maximized the sedimentation around the scoured part. In other words, the current shape has the potential to facilitate the procurement of sediment for post-flood restoration. In addition, the current shape overwhelmingly reduced the statistical dispersion associated with the experiment, suggesting that it stabilizes the trend of riverbed fluctuation even during actual floods. Based on the results, the future conservation of the Kintaikyo Bridge was also discussed.