Scaled experimental study on impulse wave generated by a typical semi-submerged landslide with a low Froude number in reservoir areas—Taking Wangjiashan landslide as an example

被引：0
|
作者：
Huang B. [1 ,2 ]
Hu L. [1 ,2 ]
Li R. [3 ]
Hu L. [1 ,2 ]
Chen Y. [1 ,2 ]
Hu B. [1 ,2 ]
Zhang P. [1 ,2 ]
Qin Z. [1 ,2 ]
Dong X. [1 ,2 ]
机构：
[1] Hubei Key Laboratory of Disaster Prevention and Mitigation, Hubei, Yichang
[2] College of Civil Engineering and Architecture, China Three Gorges University, Hubei, Yichang
[3] China Three Gorges Corporation, Sichuan, Chengdu
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷 / 08期
关键词：
Baihetan Reservoir; drag effect; semi-submerged landslide-induced impulse wave; slope engineering; the intensity of impulse wave; wave type conversion;
D O I：
10.13722/j.cnki.jrme.2022.1073
中图分类号：
学科分类号：
摘要：
Impulse wave generated by semi-submerged landslides in large reservoir mostly has a low Froude number，and its impact effect and wave characteristics need to be further revealed. Taking the Wangjiashan landslide of Baihetan reservoir as an example，a large-scale three-dimensional scaled landslide-induced impulse wave(LIW) experiment with the size of 30 m×27 m×1.5 m was constructed with a geometric scale of 1∶150，following the Froude similarity criterion. Nine groups of LIW experiments with Froude number of 0.08–0.32 were carried out to study the wave regularity of wading landslide under low Froude number. The research results show that as Fr≤ 0.15，the drag effect caused by the underwater motion is greater than the impact effect caused by the subaerial sliding mass at the beginning of motion，and the wave appears with a small trough at first. The type of primary wave generated by the landslide with a low Froude number is mostly transition wave. In the process of wave propagation，the wave type is easily transformed from the wave type with big translation capacity to that with low or non-translation capacity. The dimensionless wave amplitude and wave attenuation rate are linear and logarithmic functions with Froude number，respectively. Wave making efficiency of wading landslide with a low Froude number is lower than that of subaerial landslide with a high Froude number. The increase of the Froude number will lead to the strongly expansion of the hazard zone of impulse wave，and the increased red warning area multiple is about 10 times that of the increase of Froude number. These new understandings revealed the concealment and hazardous of LIW in the reservoir，supporting prevention and mitigation of impulse waves in the reservoir area. © 2023 Academia Sinica. All rights reserved.
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页码：1899 / 1909
页数：10
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