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<p>Landslide-generated impulse waves cause significant casualties and property damage, particularly in narrow reservoirs, attracting substantial concern. In this study, the entire water body in a narrow reservoir is divided into three parts according to the variability of local still water depths, namely the water body on the riverbed (WRB), the opposite banks (WOB) and the inside banks (WIB). The three-dimensional (3D) wave propagation characteristics in the WRB, WOB, and WIB regions were investigated through 180 trials across 36 cases. Results reveal that the most substantial decay or growth in relative first wave crests (<i>ɑ</i><sub><i>c</i>1</sub>/<i>h</i>) and troughs (<i>ɑ</i><sub><i>t</i>1</sub>/<i>h</i>) occurs at an angle of <i>θ</i> = 10° instead of <i>θ</i> = 0°. Regions closer to the landslide occurrence exhibit more pronounced variations in <i>ɑ</i><sub><i>c</i>1</sub>/<i>h</i>, <i>ɑ</i><sub><i>t</i>1</sub>/<i>h</i>, and relative first wave periods <i>T</i><sub><i>c</i>1</sub>(<i>g</i>/<i>h</i>)<sup>0.5</sup> with <i>θ</i>. The first wave celerity <i>c</i><sub><i>c</i>1</sub>/(<i>gh</i>)<sup>0.5</sup> in all regions can be approximated using long wave theory. The relative radius <i>r</i>/<i>h</i> = 4.85 (<i>r</i> = 1.7&#xa0;m) marks the WRB boundary for wave amplitude influenced by landslide momentum. An empirical equation set is proposed to predict <i>ɑ</i><sub><i>c</i>1</sub>/<i>h</i> and <i>ɑ</i><sub><i>t</i>1</sub>/<i>h</i> in WRB, WOB, and WIB, demonstrating effective wave attenuation predictions for narrow reservoirs compared to previous models. Runup (<i>R</i><sub><i>u</i></sub>) predictions in the WOB region of Chehalis Lake, from riverbed (IPB) to water surface (IPS), show that LPB-based predictions align more closely with measurements than LPS-based ones. Overall, dividing the water body into three parts is essential for analyzing the wave propagation characteristics in narrow reservoirs.</p>

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Three-dimensional experimental analysis of landslide-generated impulse waves in narrow reservoirs with variable local water depths

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Chao Ke,
  • Fasheng Miao,
  • Yang Wang,
  • Beibei Yang,
  • Yiping Wu,
  • Jizhixian Liu,
  • Yu Zhang,
  • Xi Li

摘要

Landslide-generated impulse waves cause significant casualties and property damage, particularly in narrow reservoirs, attracting substantial concern. In this study, the entire water body in a narrow reservoir is divided into three parts according to the variability of local still water depths, namely the water body on the riverbed (WRB), the opposite banks (WOB) and the inside banks (WIB). The three-dimensional (3D) wave propagation characteristics in the WRB, WOB, and WIB regions were investigated through 180 trials across 36 cases. Results reveal that the most substantial decay or growth in relative first wave crests (ɑc1/h) and troughs (ɑt1/h) occurs at an angle of θ = 10° instead of θ = 0°. Regions closer to the landslide occurrence exhibit more pronounced variations in ɑc1/h, ɑt1/h, and relative first wave periods Tc1(g/h)0.5 with θ. The first wave celerity cc1/(gh)0.5 in all regions can be approximated using long wave theory. The relative radius r/h = 4.85 (r = 1.7 m) marks the WRB boundary for wave amplitude influenced by landslide momentum. An empirical equation set is proposed to predict ɑc1/h and ɑt1/h in WRB, WOB, and WIB, demonstrating effective wave attenuation predictions for narrow reservoirs compared to previous models. Runup (Ru) predictions in the WOB region of Chehalis Lake, from riverbed (IPB) to water surface (IPS), show that LPB-based predictions align more closely with measurements than LPS-based ones. Overall, dividing the water body into three parts is essential for analyzing the wave propagation characteristics in narrow reservoirs.