Journal of Changjiang River Scientific Research Institute ›› 2025, Vol. 42 ›› Issue (1): 98-105.DOI: 10.11988/ckyyb.20230904

• Water-Related Disasters • Previous Articles     Next Articles

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

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

CLC Number: