新澳门游戏网站入口 院报 ›› 2025, Vol. 42 ›› Issue (1): 98-105.DOI: 10.11988/ckyyb.20230904

• 水灾害 • 上一篇    下一篇

冲击滑坡涌浪近场传播时频分析

黄筱云1,2(), 刘子亮1, 黄瑞启1, 程永舟1,2   

  1. 1 长沙理工大学 水利与环境工程学院,长沙 410114
    2 长沙理工大学 水沙科学与水灾害防治湖南省重点实验室, 长沙 410114
  • 收稿日期:2023-08-21 修回日期:2023-11-10 出版日期:2025-01-01 发布日期:2025-01-01
  • 作者简介:

    黄筱云(1980-),男,湖南津市人,副教授,博士,主要从事边坡稳定与滑坡涌浪研究。E-mail:

  • 基金资助:
    国家自然科学基金面上项目(52171245); 湖南省教育厅澳门网络游戏网站官网首 重点项目(20A011)

Time-frequency Analysis of Near-field Propagation of Impulse Waves Generated by Subaerial Landslides

HUANG Xiao-yun1,2(), LIU Zi-liang1, HUANG Rui-qi1, CHENG Yong-zhou1,2   

  1. 1 School of Hydraulic and Environmental Engineering,Changsha University of Science and Technology,Changsha 410114,China
    2 Hunan Provincial Key Laboratory of Water and Sediment Science and Water Disaster Control, Changsha University of Science and Technology,Changsha 410114,China
  • Received:2023-08-21 Revised:2023-11-10 Published:2025-01-01 Online:2025-01-01

摘要:

为深入了解冲击滑坡涌浪近场传播的规律,运用FLOW-3D软件建立三维滑坡涌浪数值模型,模拟滑坡体入水产生涌浪以及涌浪近场传播过程,并通过小波变换对三维涌浪近场历时变化进行时频分析。结果表明:三维滑坡涌浪的能量从主径向朝两侧逐渐传递;至入水点2倍水深距离以外,其他径向上涌浪能谱演化特征趋向与主径向一致,所有径向上涌浪局部波能沿程衰减率接近,主频附近的组成波的波能传递速度不随径向角变化。基于此,进一步提出近场特征波能峰值与近场特征波能传递速度的概念与估算公式,为滑坡涌浪灾害评估提供参考。

关键词: 冲击滑坡, 三维涌浪, 近场, 小波变换, FLOW-3D

Abstract:

To elucidate the near-field propagation characteristics of waves generated by subaerial landslides, we developed a three-dimensional numerical model of subaerial landslide impulse waves using FLOW-3D. We simulated the landslide body’s entry into water and subsequent wave propagation, and analyzed the 3D impulse wave’s temporal-frequency evolution via wavelet transform. Our findings reveal that the energy of the 3D landslide impulse wave primarily shifts from the main radial direction to the sides. Beyond a distance of two times the water depth from the plunging point, the energy spectrum’s evolution in other radial directions closely resembles that in the main radial direction. Additionally, the decay rate of local energy across all radial directions becomes consistent, and the energy transmission velocity of wave components near the dominant frequency does not vary with the radial angle. We further introduce the concepts and estimation formulas for the near-field characteristic wave energy peak and its transmission velocity, which are valuable for assessing landslide surge disasters.

Key words: subaerial landslide, 3D tsunami, near field, wavelet transform, FLOW-3D

中图分类号: 

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