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River level monitoring to reduce scour risk
| 题名： | River level monitoring to reduce scour risk |
| 正文语种： | eng |
| 摘要： | The stability and integrity of structures such as bridges, culverts and walls can be compromised by bridge scour where fast-flowing water removes material from around the footings of bridge abutments and piers. There are three main types of scour*. Local scour is caused by the faster water flow that occurs around piers and abutments. Constriction scour is created by water accelerating through a narrow opening. Meanwhile, degradation scour can lower a riverbed over a longer period, both upstream and downstream of a structure. The effects of bridge scour can be disastrous. For example, during a flood in 1987, the Glanrhyd Bridge in Carmarthenshire, Wales, partially collapsed, causing a train to plunge into the River Towy, killing the driver and three of the passengers. In 2009, failure of the Malahide Viaduct in Dublin, Ireland, was caused by foundation scour. Two commuter trains packed with hundreds of passengers were just seconds away from disaster when a 20m section of the viaduct collapsed after they passed over it. Nobody was killed, but travel chaos ensued. |
| 出版年： | 2022 |
| 期刊名称： | World highways |
| 卷： | 31 |
| 期： | MAY/Jun. |
| 页码： | 14-15 |
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